Research website of Dr Gilbert Price

Revealing the life and times of an Ice Age giant

My team and I have just had a new study published that that looked at the question of migration in a species of giant, now-extinct, Ice Age megafauna of Australia.

The beast under the ‘microscope’ is Diprotodon optatum, famous for being the largest marsupial that ever existed. It stood 1.8 metres tall at the shoulder and weighed in at around 3,000 kg.

A herd of Diprotodon being stalked by the giant lizard, Megalania, while a couple of megafaunal kangaroos look on (image: Laurie Beirne)

A herd of Diprotodon being stalked by the giant lizard, Megalania, while a couple of megafaunal kangaroos look on (image: Laurie Beirne)

Diprotodon was one of the very first fossil animals ever described from Australia. Subsequent fossil records show that it had a near cosmopolitan distribution across Ice Age Oz, plus was one of the last surviving members of the megafauna.

But there’s a lot that we just don’t know about this animal, such as how it responded to seasonal changes; what its ecological role was; it’s basic biology… important questions that are critical in helping us understand why we don’t have Diprotodons anymore.

 

What we did

Our new study focussed on the life and times of an individual that once called the Darling Downs of southeast Queensland its home. We wanted to know what it ate, if it was a migratory species, and how it responded to changes in its environment.

Unlike some of their placental cousins, most modern marsupials don’t migrate at all. Some species, such as Red kangaroos (Macropus rufus) occasionally exhibit ‘nomadic’ migration where an individual or two will leave a home range, but with no specific plan or intention to return.

But what about Diprotodon? Weighing in at three tonnes, it’s more than 30 times the mass of the largest living marsupial, and likely had a very different ecological role when alive.

We applied a variety of geochemical analyses to a Diprotodon incisor tooth that we had borrowed from the Queensland Museum.

Diprotodon had ever-growing front chompers, so we predicted that our geochemical analyses (including carbon, oxygen, and strontium isotopes) would reveal lifetime changes in things like diet, water intake, plus also information about possible migration.

 

What we found

Without getting into the nitty gritty details, our study yielded some fascinating results. Firstly, our Diprotodon was clearly a seasonal migrant. It would undertake massive round-trips of up to 200 km per year as it tracked its preferred food source (basically, a combination of different species of grasses and leaves).

This is known as ‘two-way’ migration and is an evolutionary response to annually fluctuating resources.

 

Our discovery of such migration is a first for any marsupial living or extinct. That’s wildly fascinating in itself because marsupials have been around for a very long time. In fact, marsupials and their broader cousins, the metatherians (the group that includes all modern marsupials, but not placental or egg-laying mammals), have been on Earth for at least 160 million years. And until now, none have been known to have conducted such migration.

But perhaps more importantly, our data suggest that Ice Age Australia was just so ecologically different to anything that we’ve previously imagined.

In fact, the palaeo-ecosystem that we envisage seems more like the modern Serengeti than anything that we have Downunder today.

 

Some burning questions

Zebra are modern migrating mammals of East Africa's Serengeti

Zebra are migrating mammals of East Africa’s Serengeti

At the end of the day, we’re left with even more questions than what we started out with. Which other megafaunal species migrated? What were the consequences of their removal from Ice Age ecosystems? And especially, what are the implications for understanding Australia’s modern ecology?

These are major questions that need to be addressed, and will form the focus of future investigations.

We are massively appreciative of all the institutions that supported this research: The University of Queensland, University of Rochester, Southern Cross University, and Griffith University. Huge thanks to the Queensland Museum (and especially Kristen Spring) for their support, Nathan Siddle for making the 3D model, and the Australian Research Council for funding this research.

Is the Tasmanian Tiger really extinct?

There’s been a flurry of media reports out this year that have asked the question: Is the Tasmanian Tiger really extinct? Many of the stories are based off a media release put out by James Cook University where a couple of their researchers have plans to set-up a camera trap survey in north Queensland in search of this enigmatic marsupial.

Tasmanian Tigers, otherwise known as ‘Thylacines’ or ‘Marsupial wolves’, are thought to have suffered extinction on the 7th of September, 1936. That might sound like a very specific date to know when anything went extinct, and it is. But there’s quite a tragic story behind it.

 

The demise of the Tasmanian Tiger

Most people will know that Tasmian Tigers were the top land-dwelling predator in Tasmania until British colonisation. A devastating combination of over-hunting, competition with feral dogs, and exposure to new foreign diseases, did not bode well for their survival.

In 1901, the Tasmanian Government recognised that they had a conservation problem on their hands… but did nothing serious to remedy the situation until it was too late.

It wasn’t until the 10th of July, 1936, that legislation was finally passed that allowed for the protection of the Tasmanian Tiger. At that stage, Tasmanian Tigers hadn’t been reliably recorded in the wild for several years. In fact, the only known living member of the species at the time was Benjamin, a young adult male in Hobart’s Beaumaris Zoo.

Thylacine hunter

Thylacine hunter

Sadly, on one cold night in September 1936, a keeper forgot to let Benjamin back into his shelter and he was found deceased, exposure being the killer.

59 days.

59 days from the time that the Tasmanian Tiger was officially protected, to the time that the last known individual died.

 

But what if Tasmanian Tigers aren’t actually extinct?

Since 1936, there have been numerous but hitherto unverified reports of Tasmanian Tiger sightings. But is that about to change now that Science has become more involved?

It was interesting to read the plethora of comments that the public have left on the recent news articles and in social media. They vary from “hey, this is cool!” to “if they’re really out there, just let them be!”

As someone who researches, writes, and teaches science, I’m very much in the “this is cool” camp, but with a caveat. We can’t save what we don’t know about. I think that the key to conservation and environmental management is public awareness and education.

All that aside though, the recent media reports did get me thinking. What if Tasmanian Tigers aren’t really extinct? Could there be a viable population living in remote parts of north Queensland?

We know on the basis of the fossil record that Tasmanian Tigers did once live on the mainland. In fact, prior to around 4,000 years ago, Tasanian Tigers also used to call New Guinea their home.

 

An unexpected discovery

My crew and I went on a fieldtrip a couple of years ago to some caves west of Townsville in north Queensland. Squirming around on my stomach in a tight squeeze of one particular cave, I stretched out my hand and picked up a bunch of loose teeth from the surface. It was an amazing moment for me and something that I’ll never forget: they were the teeth of a Tasmanian Tiger.

Fossil Tasmanian Tiger teeth from a cave in North Queensland

Fossil Tasmanian Tiger teeth from a cave in North Queensland

They were discoloured, so not quite the pearly whites that you’d expect with fresh teeth, but they were remarkably well-preserved. Both the crowns and roots were completely undamaged. That’s very unusual for any type of fossil, so you can imagine my surprise to find them like that.

Does this astonishing preservation and fact that they were found simply lying on the surface mean that they are actually really young?

I’ve not yet had an opportunity to fully analyse and date the teeth yet, but wouldn’t it be amazing if they were from an animal post-dating 1936. It would certainly challenge everything that we know about Tasmanian Tiger and their supposed time of extinction, not to mention also giving credence to anyone who has claimed to have seen a living Tasmanian Tiger on the mainland.

Better get to the lab…!

What happened to Australia’s Ice Age megafauna: The public perception

Diprotodons, giant kangaroos, marsupial lions, and massive lizards: just some of Australia's Ice Age megafauna

Diprotodons, giant kangaroos, marsupial lions, and massive lizards: just some of Australia’s Ice Age megafauna

Huge land turtles, 8-foot tall kangaroos, massive cold-blooded killer goannas… these are but a few of the giant animals that once roamed Australia during the Quaternary: the period of geological time that we often refer to as the ‘Ice Ages’. But what happened to these megafauna? When did they go extinct and why?

It’s a research area that I am most fascinated by. And talking to others, it’s definitely something that inspires a lot of discussion and debate. I mean, who doesn’t love a good mystery, right? And in this case, it’s an Ice Age cold case and one of the biggest research questions in the Australian palaeo-sciences.

 

Extinction and public opinion

I recently had the privilege of being invited to give a presentation for BrisScience. BrisScience is a Brisbane-based monthly lecture series that aims to bring scientists and their science out of the lab and deliver it direct to the public. So for me, that meant packing up my thoughts and turning it into something digestible and interesting for a diverse audience.

What happened to the marsupial 'rhino', Zygomaturus?

What happened to the marsupial ‘rhino’, Zygomaturus?

It doesn’t matter if you’re a hardcore scientist or just a regular person walking down the street, everyone seems to have an idea about what happened to the megafauna. For scientists, they might form their opinion based on reading scientific literature. For members of the public, a lot of the time their thoughts might be crafted by things like media reports or easily assessable information websites such as Wikipedia.

Working in this space day in, day out, it’s sometimes hard to gauge an idea what people outside of the research community actually think. But here at BrisScience, I had an opportunity to go direct to the public and get their thoughts.

Why the megafauna went extinct: the public perception (credit: Tara Horner via Twitter)

Why the megafauna went extinct: the audience votes! (credit: Tara Horner via Twitter)

During the presentation, rather than have the audience put up their hands and shout things out, I used Mentimeter software to pose the question: “Why did the megafauna go extinct?” The audience were invited to go to a particular website and type in their answers using their phones. The answers were then broadcast live directly into my PowerPoint presentation as an evolving word cloud.

The results were really fascinating! There were 105 respondents out of the 300 or so in the room. Aside from a few creative answers such as unicorns, Jesus, and Flying Spaghetti Monsters, there seemed to be a clear candidate for the extinctions: climate change.

 

The results are in!

The results are in!

 

An unexpected response

Science tells us that the time of the megafauna was punctuated by repetitive wet and dry phases in climate, with a long-term trend towards progressively drier and drier conditions. In fact, the last glacial cycle that led into the most recent Ice Age was the harshest episode of climatic change of the entire Quaternary.

But I didn’t tell the audience that prior to the survey. All I had mentioned was that humans arrived in Australia around 55-60 thousand years ago, that the Quaternary was characterised by swings in climate, and that the megafauna were (mostly) extinct.

Climate change was not the answer that I was expecting; I thought it would have been human hunters for sure. But in a way, I found a lot of comfort in the overarching public view.

That’s not because I necessarily think that climate change wiped out all 90 species of Australian megafauna, but because of the worrying way that the debate has been playing out of late.

 

What we really know about the extinctions

There have been a spate of finger-pointing research articles recently, all arguing that human hunters solely drove the extinctions. Those research articles have translated into extensive and global media coverage as well, with headlines screaming out: ‘PEOPLE DID IT!’

I’ve read those research papers very closely and must say that I’m not convinced. Aside from some howling mistakes (like this one reporting the extinction of the kangaroo, Macropus, 43 thousand years ago… Macropus are very much alive and well, and include modern species like Red and Grey kangaroos, as well as 13 or so other extant members), the data just don’t stack-up to comprehensively ‘prove’ that humans did it.

Some of the recent headlines

Some of the recent headlines

Ideally, to test the human overkill model, you need to first show that as soon as humans arrived, all 90 species of megafauna immediately went extinct, and that climate change was not significant at the time.

A close reading of the actual datasets shows only around 15 species of megafauna date to the time period of human arrival. Most species significantly pre-date humans, or have no reliable dates at all. That is, we don’t even know when the majority of megafauna evolved, let alone, went extinct. As for climate change, a huge range of independent datasets demonstrate a big shift toward arid conditions right around the time of human arrival, so obviously, climate change cannot be excluded from the extinction equation.

The BrisScience survey was a great exercise in the end. The thing that pleased me the most, perhaps with the possible exception of whoever gave the answer “Flying Spaghetti Monster”(!), was seeing a public that are independent thinkers and are driven in seeking out the truth using alternative media.

To the BrisScience audience that night, thank you so much for coming and of course, thank you for your wonderful participation!

The Ice Age Lizards of Oz

Komodo Dragons once stalked Australia (credit: Bryan Fry / Gilbert Price)

Komodo Dragons once stalked Australia (credit: Bryan Fry / Gilbert Price)

There’s an old joke in reference to the wildlife in Australia that “everything is trying to kill you”. While that might be a fun way to scare tourists, there is no joking about the murderous killer lizards of the last Ice Age. In fact, we have just uncovered the first fossils to show that those huge lizards were still stalking the bush when the indigenous people migrated from South-East Asia to the Australian continent.

Imagine being one of those first human inhabitants of Australia. It’s around 50,000 years ago, and you’ve just finished a most extraordinary sea journey from tropical South-East Asia. You’ve already said goodbye to your family and friends and are about to begin life in a foreign southern land where the climate, landscape, vegetation and animals are completely different. It’s a scary enough image as it is, but throw in the giant predators of the last Ice Age and that image becomes truly terrifying…

 

Read the full article in the April 2016 issue of the pop-science magazine, Australasian Science. This write-up is based off an earlier technical publication from my research team:

Price, Gilbert J., Louys, J., Cramb, J., Feng, Y.x., Zhao, J.x., Hocknull, S.A., Webb, G.E., Nguyen, A.D., Joannes-Boyau, R. 2015. Temporal overlap of humans and giant lizards (Varanidae; Squamata) in Pleistocene Australia. Quaternary Science Reviews 125(1): 98-105. Available here: http://www.sciencedirect.com/science/article/pii/S0277379115300809

The hammer that shaped a university

Nearly every profession has its own iconic piece of equipment. Doctors check vital signs with stethoscopes; photographers capture images with cameras; and chefs dice ingredients with knives. But if you’re an earth scientist, that critical go-to piece of gear is almost always the trusty rock hammer.

Andy Dufresne from The Shawshank Redemption sought solace in his hammer. Not just as a means of breaking out of jail, but to keep him sane, especially as he spent his days shaping and carving lumps of soapstone into chess pieces.

Screenshot of Andy Dufresne (played by Tim Robbins) using his rock hammer in The Shawshank Redemption (source: Castle Rock Entertainment).

Screenshot of Andy Dufresne (played by Tim Robbins) using his rock hammer in The Shawshank Redemption (source: Castle Rock Entertainment).

For the practising geologist or palaeontologist, a similar kind of comfort is wrought by the humble hammer.

Imagine using one to split a rock: the rock breaks in half to reveal the fossilised remains of an ancient, extinct creature. You are the first person in all of human history to ever set eyes on it. The fossil tells you a story, a small part of a much larger jigsaw perhaps, but a story about the history of our planet. And all this from the simple strike of a hammer.

So the rock hammer is by far the most valued bit of gear for any earth scientist. You can probably imagine then, the emotions among my team and I when we first laid our eyes on the rock hammer that once belonged to the legendry Professor Dorothy Hill.

 

A science great

Dorothy was a giant, not only of palaeontology and geology, but of science more broadly. And she has an incredible legacy at The University of Queensland.

Dorothy Hill

Dorothy Hill

She first attended UQ as an undergraduate student in the mid-1920s, when the university’s total enrolments numbered around 700; today, that figure is in excess of 50,000. She graduated with Honours in 1928, later accepting a scholarship to travel to England  to undertake a PhD at the University of Cambridge. Dorothy graduated after only two years; an incredible achievement in itself, but all the more remarkable in that she was only the second Queenslander to earn their stripes at that prestigious institution.

When she moved back to Australia in 1937, Dorothy took up a lectureship in the geology department at UQ. Times were tough coming out of the Great Depression, and not made any easier during World War II. Dorothy’s research was put on-hold temporarily when she took up a position ciphering code for five-star American army general Douglas MacArthur.

A post-war Australia saw Dorothy’s scientific pursuits flourish. Her research specialty was in ancient fossil corals, an area in which she eventually published more than 100 papers. She named numerous new species previously unknown to science. This earned her widespread recognition and the award of several prizes and fellowships.

Dorothy was also a great servant of science. In 1947 she became President of the Royal Society of Queensland, the State’s oldest scientific institution. In 1970 she assumed the role of President of the Australian Academy of Sciences. And in 1971 Dorothy became President of the Professorial Board at UQ. These achievements were no mean feat. In fact, Dorothy was a trailblazer in that she was the first female president ever in each of those roles.

Dorothy Hill in 1987, standing below her sandstone grotesque where it adorns the Richards Building in the Great Court.

Dorothy Hill in 1987, standing below her sandstone grotesque where it adorns the Richards Building in the Great Court.

Dorothy died in 1997, but is today still recognised widely among the scientific community. She is honoured in numerous ways, including having a UQ library named after her, a PhD scholarship, a couple of national science prizes, and even a drill rig. She is also the only woman scientist depicted in the sandstone carvings of UQ’s Great Court.

 

Dorothy’s hammer

My team had heard the legend of Dorothy’s hammer and were keen to get our hands on it. After several inquiries, we were excited to learn that it was in the possession the School of Earth Sciences’ Professor Gregg Webb, who happily passed it to us.

To first lay eyes on the hammer, one wouldn’t be all that impressed. It’s a very simple design: a plain hickory wooden handle, with a very rusty, ridged, angular steel head. It lacks the flair and curves of most modern rock hammers. But it has an underlying appeal, especially if you know its history, for it is more than just a hammer: it’s a symbol of curiosity, exploration and determination. It’s Dorothy Hill’s rock hammer.

We dare not use the hammer ourselves, thus, preserving knowledge that the last time it was struck to reveal an ancient fossil, it was at the hands of Dorothy herself.

We’ve made a 3D model of the hammer, with the intention that it will be used in an upcoming exhibition celebrating the life of Dorothy. But we share it here in the hope that it can bring the same level of inspiration to others that it brought to us.

This post first appeared on UQ’s Small Change blog.

How to explain everything

When I’m not doing research, I coordinate a second year Science course at uni, ERTH2002 Palaeobiology. It’s essentially a course where we take the students on a journey through the 4.6 billion year history of life on Planet Earth. One of the things that I’m really keen on is making the class really engaging and hands-on. After all, life is pretty amazing as it is, but throwing a bunch of fossils into the mix can really spice things up.

Each of the prac classes are taught with real fossils and rocks. We would have literally hundreds of different types of things over the semester, from ancient stromatolites nearly 3.5 billion years old, through to Ediacaran fossils, beasts of the Cambrian Explosion, all the way down to the Ice Age megafauna of the last 50 thousand years. At the start of each class, we basically just run through the prac and the specimens, emphasising why this stuff is important for the students to know, and go from there.

Using Explain Everything in class

Using Explain Everything in class

I always found the intro bits a little static- just standing in front of the class, sometimes with a PowerPoint presentation, running through what the students need to do, then letting them loose on the fossils. I recently came across some new software that makes the class a lot more interactive, interesting, and definitely engaging. The software is called ‘Explain Everything’.

Explain Everything is kind of like a digital whiteboard for your tablet or computer, but really, it is much more than that. The teaching space that I have is a large room with a single data projector. I was able to download the software (only around $4!) from the Windows store and install it on my Surface Tablet (a Surface 2). To stream it through the projector without the use of cables, I had to buy a Windows wireless adaptor (around $100). It took a bit of mucking around with the adapter and computer settings, but we (with the help of someone a little bit more computer savvy than myself) were able to get it going.

Tallying up species counts of Triassic plants using Explain Everything

Screenshot tallying up species counts of Triassic plants using Explain Everything

With Explain Everything, there is just so much stuff you can do with it- from not only drawing on it and have it broadcast live to the class on the projector, to annotating pics of fossil specimens, browsing websites (and annotating them too), pdfs of papers, taking live photos and videos (and more annotating, of course!).

That last bit is especially the thing that I like the most. With some types of fossils, it’s hard to get more than one specimen. By necessity, that means that the students have to share them. With Explain Everything, if there is something particularly important or interesting that I want everyone to see, I would typically walk up to the fossil in class and either take a photo or video of it. There’s no need to pre-photograph or video anything as it loads into Explain Everything live. With the set-up that I’ve got, whatever you see on the tablet screen is what gets projected to the class. And having a wireless connection to the projector, I can easily move around the entire classroom to wherever the fossils are laid out.

It’s just so easy to then describe the specimen- draw all over it, flip it around the screen, whatever you need to do to convey the important bits. You can also even press the ‘record’ button and it’ll basically capture the screen as you’re photographing / drawing or whatever. It even records audio. You can then export this later and if necessary, upload it to the class teaching site so that the students can access it either during the class, or later for home study. Check out the video to see it in action:

In the prac session depicted in the images and video of this blog post, the students were required to identify a range of fossil plants (dating to the middle Triassic… so dinosaur food!), tally up the numbers to assess diversity, and a range of other things. We used Explain Everything here to write up a list of plant names and score up the tally, as well as take photos of representative species to help with the plant id’s. It’s just too easy to use. The final tally was saved and exported as a JPEG file, and later uploaded to the class Facebook group page so that the students could complete the prac in their own time. It’s just such useful software.

This blog post might sound like an ad for Explain Everything, but I can assure you that it is not. I was not invited by Explain Everything to write this post, and I’ve not received a dime or any incentive at all to talk about it. It’s just a nifty, and very inexpensive, bit of software that I think would benefit a wide variety of teaching, not just in palaeontology. I’ll definitely be using it in the years to come.

Live from the dig- Day 3

Our final day in the field kicked off with the same great weather that had made the past couple of days so wonderful. It’s just such a good time for field work. We only had a short day in front of us as we had to get back to Brisbane by the late afternoon, so we all got up and made our way down to the fossil site bright and early.

Marsupial tapir

Lower jaw of the marsupial tapir, Palorchestes parvus, found by Kyle on Day 2

Our first task of the day was to plaster jacket some of the larger specimens that the team had partially excavated on Day 2. The fossils included a wonderful atlas vertebra of the large wombat-like Euryzygoma, and a femur and enormous tibia of a giant long-faced kangaroo, Macropus. We’re not sure on the exact species yet, but it is one of the Pliocene guys that are closely related to the modern kangaroos of today, such as the greys, reds and wallaroos.

For the task of making the plaster jackets, we were joined by a small team of students from the Steiner School. They were super enthusiastic, and under the supervision of Joanne and myself, they did a wonderful job in jacketing the specimens. The first step was to apply soggy newspaper to the bones. This acts as a barrier between the plaster and fossils, plus also protects the bones during transport. Joanne mixed up the plaster, while Tara cut up a bunch of hessian strips. The students then soaked the hessian in the plaster and applied them to the specimens, much in the same way that a doctor might plaster a broken leg. It’s a messy job, but one of the fun parts of fieldwork!

Plastering fossils

The crew plastering a fossil femur of a giant kangaroo

While we were working on the plastering, Mel and Julien ducked off to collect a fossil that Mel had spotted yesterday- an enormous humerus of Euryzygoma. The specimen is a cracker, measuring around 70 cm in length. It was a bit of a rush job as we didn’t have the time to perform a more controlled excavation. The specimen came out well, and will eventually end up at the Queensland Museum for preparation.

We made our way back to Brisbane, arriving around 4 pm. All in all, it was a wonderful reconnaissance trip to a really significant Pliocene-aged fossil site. We got everything done that we needed, but do wish that we could spend more time out there. Our prospect for conducting future research in the area is dependent on funding. We’re desperately trying to secure research grants to continue the work. It’s a difficult climate at the moment for science and research funding, but we’re hopeful that our efforts and work achieved to-date on a shoestring budget will demonstrate to the powers-that-be that this research is particularly important and deserving of further support.

This trip would not have been possible without the generous assistance of Cec and Doris Wilkinson, the Chinchilla Gun Club, Samford Valley Steiner School, Joanne Wilkinson of the Queensland Museum, and Julien Louys of the Australian National University. Their support has been absolutely brilliant. If you followed us on the Twitter hashtag #LiveFromTheDig, we hope that you enjoyed the adventure!

 

Live from the dig- Day 2

WOW!!! What an awesome day! It started so well. We woke at dawn to some absolutely spectacular weather. The temperature was perfect for digging, and a faint, but crisp, breeze was gently blowing. As it turned out, it was a pretty good omen.

Dr Julien Louys with a 3.5 million year old lungfish tooth plate

Dr Julien Louys with a 3.5 million year old lungfish tooth plate

We got to the dig site early and continued on from our work the previous day. Kyle excavated an enormous kangaroo femur that he had found yesterday. Nick stumbled across the lower jaw of a giant wombat-like marsupial, Euryzygoma. It had no teeth, but there were a few other unmistakable characters that showed us that it was undoubtedly the big fella. Tara had some early frustrations, but came good in the afternoon finding a fantastic bunch of kangaroo teeth- the ancestors of today’s grey kangaroos.

I didn’t have much luck myself in the field today, but as the old saying goes, there is no ‘I’ in team! In fact, it would be fair to say that I was outshone by my student, my young padawan, Kyle. After lifting the femur, Kyle started to scratch around on the other side of the gully. And he found something cool! It was the lower jaw of a marsupial tapir, a beast called Palorchestes parvus. These things basically resembled the modern placental tapirs of Southeast Asia and South America, but had a pouch. Although these guys have been known about for over 100 years, only a handful of specimens have ever been recovered. The new specimen is going to make a really great addition to what we can learn about this bizarre animal.

Fossil croc tooth cemented into conglomerate

Fossil croc tooth cemented into conglomerate

In the afternoon, we were joined by Joanne’s husband, Mel Wilkinson. I’ve been in the field with Mel a few times before and it would be fair to say that he has a real nose for fossils. As soon as he arrived, Mel picked up a molar tooth of the marsupial lion, Thylacoleo crassidentatus. About half an hour later, Mel had uncovered another wonderful specimen of Euryzygoma– an exquisitely preserved lower jaw (we need to bring Mel out on these digs more often!).

So, our total for the day includes two types of diprotodontoid (the massively weird wombat-like marsupials including Palorchestes and Euryzygoma), about five kangaroo species such as Giant greys (Macropus pan), Giant forest wallabies (Protemnodon), and Giant hair-wallabies (Troposodon), plus a bunch of turtles, crocs, fish, and even some fossilised freshwater bivalves. All in all, a wonderful day in the field!

In the evening, we visited the Steiner School camp. Our two students, Nick and Kyle, made a short show-and-tell presentation to the Grade 10-ers about the various fossils that we had picked up over the past couple of days. Julien gave a ‘big picture’ talk on what we were doing out there, and why the palaeontological work is so important, especially in regards to how we can use the past to inform modern conservation strategies. The Steiner students are a switched-on bunch and asked a lot of great questions.

If you’re on Twitter and would like to follow our exploits live, we’ll be tweeting with the hashtag #LiveFromTheDig. One more day to go!

 

 

Live from the dig- Day 1

The best times that you can hope for at work are those days when you don’t have to actually go to work! And that’s what happened to me today. Only a few weeks in the planning, my crew and I left this morning for a fossil dig at an awesome Pliocene (3.5 million year old) fossil site near Chinchilla on the Darling Downs, around three hours drive west of Brisbane.

Euryzygoma tooth

A 3.5 million year old tooth from the weird wombat-like marsupial, Euryzygoma

Our goal of the trip: to have a scout around the area, keeping an eye out for fossils of the ancestors of our modern vertebrate faunas. We were joined on our trip by our dear friend, Joanne Wilkinson from the Queensland Museum, an awesome bunch of Grade 10 kids from the Samford Valley Steiner School, and my interstate colleague, Dr Julien Louys from the Australian National University in Canberra.

The Samford crew are undertaking a super-important mapping project in the area, plotting in all of the major fossil layers from which bones have been collected from over the past 30-odd years. My crew consists of Dr Tara Clark, PhD student Kyle Ferguson, and Honours student Nick Wiggins. Both Kyle and Nick have been on only a few fossil digs, so it’s a great opportunity for both of them to get their hands dirty and a bit of field experience under the belt. Julien works on a wide range of projects across Australia and Southeast Asia, and is particularly keen in extending his primary research into the Pliocene history of our continent.

Euryzgoma tooth

Another Euryzgoma tooth, this time a lower incisor

We left really early, making it out to the site by around mid-morning. Our first day was spent inducting the students around the fossil site, and collecting the odd bit of fossil bone here and there. Our best discoveries of the day include fossil bones of giant and weird wombat-like marsupials like the enigmatic Euryzygoma, fossils of giant grey kangaroos (Macropus pan) – the ancestors of the modern roos – plus a massive range of fossil crocodile bits and pieces. Taken together, we can see that diversity around the area was markedly different in the past. The weird marsupials are totally extinct today, and the crocs are now found only in tropical parts of Australia.

We are going to be tweeting live from the dig during the course of the trip. Some of our discoveries are featured below. If you’re on Twitter and would like to learn more, you can follow our trip with the hashtag #LiveFromTheDig. We’ll also do our best to post daily blog updates here on our progress.

 

 

 

 

Getting down underground in search of Ice Age megafauna

Fieldwork in caves

Fieldwork in caves

People often ask me what is involved in my fieldwork. It’s always pretty fun to describe the kinds of places that I get to go and to reflect on the type of work that I do. From working along crocodile-infested rivers in search of fossils eroding out of ancient creek banks, to checking out old excavated dams in the backs of farmer’s paddocks, fieldwork is pretty amazing and there’s nothing else quite like it.

One of the things that people seem to get a bit squeamish about, is the caving side of fieldwork. Caves are brilliant for accumulating the fossil remains of ancient animals, as I’ve mentioned in a couple of previous posts. To me, getting down and underground in search of fossils is quite fun, but it can also be pretty challenging, especially in some of the caves that I visit.

Crocodile tooth found along this river

Crocodile tooth found along this river

The short video below presents some of my work in caves in northern Australia. I’m always on the lookout for vertebrate fossils of any kind, but this is one of the more interesting caves that I get to visit:

It’s chock-full of the remains of Australia’s ancient Pleistocene megafauna – the Ice Age beasts that ruled Australia up until around 30-50 thousand years ago. The fossil assemblages in these deposits are really diverse, and include the remains of marsupial lions, diprotodons, giant forest wallabies, thylacines, and a range of other incredible animals.

Check out the video and let me know what you think- would you be up for this kind of fieldwork? The video was put together to highlight the type of work that we do as part of the Integrated Palaeoenvironmental Research Group– my research team at The University of Queensland. As always, I acknowledge the great support of the Australian Research Council who has funded this research, the good folk at the Chillagoe Caving Club for their wonderful assistance in the field, as well as all of the local landowners who kindly give their permission for my team and I to access their properties in search of fossils.