This is the lower jaw of “Cynorca” occidentale UF234400, early to middle Miocene, 19-14.8 mya. This extinct peccary was part of the Centenario Fauna in Panama, and is the first fossil peccary found in Panama. Read more about this fossil find in the MacFadden et al. publication in the Journal of Vertebrate Paleontology, linked here.
This past Monday, Bruce McFadden, principal investigator of the PCP PIRE program, arrived with a group of 10 middle school and high school teachers – participants in the GABI RET program. Together with Jorge Moreno and the PCP PIRE interns, they will be exploring fossil localities throughout Panama, learning about science – not as a collection of facts, but as science in action.
The first site to be visited was the locality of Alajuela, a lake in Chagres National Park, an hour from Panama City.
On Monday of this week, I was fortunate to make several interesting fossil finds along the shores of Lake Alajuela, in Chagres National Park. The water levels were very low, which facilitated the finding of vertebrate fossils by exposing the correct sediments which they can be found in. Less than 30 minutes into the field day, I came across a chunk of fossil turtle, and after some digging, realized that there was a lot more turtle there. After working on the turtle for a while, I started walking along the exposed banks of the lakeshore, following the fossiliferous sediments.
I walked for much further than I had expected to be able to, given the low lake levels and large amount of exposed outcrop; then I found something really neat. The lake water was nearly lapping the fossil itself, so I decided to collect it in case the water levels rose or a wave came by unexpectedly and washed it away. It was a beautifully-preserved Carcharocles megaladon tooth. Certainly not a big one by any means for a “meg” (especially compared to the hand-sized behemoths that can be found in Florida creeks), but still a large shark tooth nonetheless. It was an exciting moment, finding my very first “meg” tooth in Panama. Hopefully I can find more on my return trips to Lake Alajuela this summer before the end of the internship!
Hola! My name is Robyn Henderek and I am one of the four PCP-PIRE Summer 2014 interns. I am a rising senior at Lafayette College in Easton, PA double majoring in Geology and Anthropology. Within the field of geology, I am interested in studying paleo-environmental reconstruction especially pertaining to human evolution during the Plio-Pleistocene in East Africa. This past spring, I had the pleasure of working with Dr. Craig Feibel of Rutgers University on the Hominin Sites and Paleolakes Drilling Project. My job was to record the stratigraphy of a 200-meter long continental core from Nariokotome, Kenya. In the same vein, I recently returned from a three month-long field course in the Turkana Basin, Kenya where I studied pre-historic archaeology, vertebrate paleontology and geology.
In spite of this, my interest in rocks began long before I could even pronounce conglomerate. The rocky coast of Maine first captured my attention not for it’s scientific significance but because the weathered schists and beautiful white granite intrusions made for a great playground. I would spend my summer days hopping from rock to rock, looking in the tide pools for crabs and starfish while exploring the small world I lived in.
When I got older, I learned how much more interesting our planet is, both in time and space. Now, I am so excited to be here in the Panama Canal Basin this summer exploring the Miocene.
This morning I had the privilege to go birdwatching in one of the world’s most famous Neotropical rainforest locations: Pipeline Road, just outside the small town of Gamboa in central Panama.
This has been something that I’ve wanted to do for a long time, so finally getting to Gamboa and hiking up the road through the tropical rainforest was spectacular. I also paid a visit to the nearby Panama Rainforest Discovery Center (PRDC), and was quite impressed.
It’s said that some people have seen over 300 species of birds on Pipeline Road in a single day; this may seem exorbitant (and ridiculous), but it’s not surprising if you go and see the incredible avifaunal diversity that exists there in person. I was blown away by the number of bird species that I saw, not to mention all of their beautiful and multicolored plumages. I wasn’t used to the birding style though, and was thrown off at first when I hardly saw or heard any birds upon entering the rainforest. Many Neotropical rainforest birds often appear in small flocks with multiple species all at once, followed by long periods of quiet and seemingly little bird activity. There are exceptions to this (such as with toucans and kingfishers, both of which I saw and heard along the road), but it’s surprising how different the birding was compared to back home.
Among my biggest “hits” today were an Oscellated Antbird, Chestnut-mandibled Toucan (heard, but unfortunately not seen), Broad-billed Motmot, Golden-collared Manakin, and loads of stunning hummingbirds at the nectar feeders on the porch of the PRDC’s visitor center.
I highly recommend a visit here if you’re interested in seeing rainforest wildlife (especially birds) in Panama! It was first class, and the rainforest canopy tower on their grounds was incredible too! I will definitely be returning to Gamboa again before I leave Panama this summer!
After visiting Gamboa, I returned home to Panama City to rest and prepare for the next week of fieldwork along the Panama Canal. It will surely be an interesting and productive week, especially after finding/rediscovering new localities last week. One of my top priorities early this week is to return to and collect a fossil turtle that I discovered late last week. Who knows what other awesome fossil treasures we might find next week!
Greetings and Happy (belated) American Independence Day from the Summer 2014 PCP PIRE Intern cohort! Last night we celebrated the 4th of July with classic American cuisine including hotdogs and apple pie. We hope you had a safe and enjoyable celebration as well!
This week, we travelled from the Pacific to the Caribbean with a giant snake, collected and prospected along the Panama Canal, and screenwashed sediments for vertebrate microfossils.
Our week began at STRI in Panama City, where we closed up crates containing the world’s second life-sized model of Titanoboa, the largest snake that ever lived. It was discovered nearly a decade ago in a massive coal mine in Colombia, and was first published and named in 2009. It has captivated the world ever since, inspiring a documentary film, a (first) life-sized model (currently on exhibit at the University of Nebraska State Museum in Lincoln, Nebraska, USA; formerly on exhibit at the Florida Museum of Natural History in Gainesville, Florida, USA), and even a cell phone game! Once the crates were ready, they were loaded via forklift into a truck that went to the Caribbean city of Colón; from there it will be taken by boat to Colombia for further exhibition (it was formerly on exhibit at Albrook Mall in Panama City).
Following our day of packing and transporting Titanoboa to Colón, we resumed our collecting efforts along the Panama Canal. This week wasn’t as successful as the previous, unfortunately, but sometimes that’s just the way it goes. Finding fossils in the tropics is difficult, and there’s always an element of luck that plays into it. We still collected some mammal and croc teeth, though, and I found a partial turtle shell on Thursday that I’ll return and collect early next week after making a plaster jacket for it. Also on Thursday, University of Florida Ph.D. graduate student Aldo Rincon, PCP PIRE Intern Supervisor Jorge Moreno-Bernal, and I scouted for new (and rediscovered old) fossil localities along the Panama Canal. We were very successful, and have significantly increased the number of available outcrops to prospect and quarry at.
We finished our work week at a facility in the canal-side neighborhood of Corozal, where we screenwashed sediments bagged and collected from one of our most productive Panama Canal localities, in search of vertebrate microfossils. After setting up the screenwashing apparatus and preparing the sediment to be washed, we worked through several bags and produced concentrate that will be “picked” for microfossils later on (I found a number of small caiman teeth during screenwashing though, which was exciting). It was a nice end to our work week, and a great way to start our 4th of July celebration. Thanks for reading, and farewell until my next blog post!
A follow up to yesterday’s post.
As mentioned yesterday, large bones and fragments are easy (relatively) to find in the field. Collections include turtle shell, ungulate jaws, rhinoceros and even crocodillian skulls. Hidden within the same layers we find these bones, however, are even more fossils. These fossils, which include teeth and bone fragments of rodents, bats, and other small vertebrates, are often the size of the sediment grains in which we dig, if not smaller.
In order to find these micro-specimens, we must separate bone from sediment.
We separate trash from treasure in a process known as wet sieving, or screenwashing. Sediments are soaked thoroughly and run through a series of wooden boxes with mesh screen bottoms of increasingly smaller sizes. Running the samples through these sieves allows dirt and smaller grains of rock to fall through the screens, leaving behind larger fragments.
Not every location in which fossils are found is necessarily a good location for screenwashing. Sites comprised of well consolidated rock can hardly be used – instead a site is needed that consists of soft sedimentary rocks such as mudstone, claystone, and siltstone. These can easily be broken down and washed.
Following the washing, sediments are lain down to dry.
Once dry, sediments are bagged and labeled so they can be sent for further sorting and inspection under a microscope.
In a few weeks a group of teachers will arrive with Principal Investigator Dr. Bruce McFadden to gain hands-on research experience at the fossil localities in the Canal Zone of Panama. It’s strange to think that in some way over the time that they will be here, I will in some way be teaching some small bit about paleontology to someone who could easily have been my teacher sometime in the past 10 years.
Thinking about this reminded me of one final experience to share about our time in the Azuero Peninsula that I thought was relevant to our audience.
One day I was sitting on the beach in Palo Seco where I’d found, with Liliana of STRI, a chunk of fossilized wood a bit smaller than an American football about a week earlier. That day we were there to collect fossils so, I decided to sit down to try and retrieve it. Despite the fact that it was exposed and large enough that someone could trip over it, the limestone matrix it was deposited in was incredibly tough to chip away. I sat down next to the fossil with a chisel and mallet to hack away at the rock surrounding the fossil, the aim being to get underneath it and finally free it from its rocky grave. I hadn’t been there for more than 15 minutes when four small Panamanian boys wandered over and stared at me in silence for 2 or 3 minutes. Finally, one of them asked “what are you doing?”, but in spanish. My Spanish skills are just strong enough that I decided to take a whack at explaining what I was doing to this cadre of young Panamanians. After some stumbling over pronunciation and struggling to find words or phrases to describe my activity accurately they seemed pleased with the explanation I had provided. After that, I went back to work. To my amazement, they were interested enough, or sufficiently bored, to sit and continue to watch even as chips of tough limestone pelted each of them as I continued to beat at the rock. However, I was then retrieved for a more pressing matter farther South along the beach, at which point the boys amused themselves by pulling limbs off an unlucky crab that had wandered too far from its rocky home.
It amazed me at first the patience and curiosity that these students had to watch me attempt to extract a fossil chunk of wood to little avail. Then I remembered the intensity of interest I had in dinosaurs at there age. It leads me to wonder, however far out it may be or not, whether they might remember that out of place ‘gringo’ sitting on the beach when they’re in school and decide to explore geology as they continue through school.
You may all be wondering why you’re only just hearing from us in July although we’ve been in Panama since the last days of May. Many more of you may know that we spent the intermediate time working on the Azuero Peninsula; here’s a bit about that experience.
The three weeks in Azuero were spent working and living in close quarters with a class (15 students) from the Universidad de los Andes in Bogota, Colombia.
Communication was primarily in Spanish, so we experienced near complete immersion in the language on top of having the opportunity to practice field techniques while learning the geology of an area entirely new to us. It was doubly exciting as the western portion of the Azuero Peninsula is covered little in the overall body of geologic literature providing an opportunity for us to make meaningful contributions to science through assisting the class.
For the most part, work took place in streams or on the beach, tides permitting. It was hot, difficult, and a lot of fun. Some days we spent scouting unfamiliar streams to look for new outcrops to refine our geologic map and to take samples from. Many times, we walked away from these scouting days empty handed, having found only alluvium covering the river banks and cowpies littering the we crossed to reach them. You can read more about our experiences in Azuero in the July issue of the PIRE newsletter.
It was great to meet and work alongside other scientists, interns, and students from the Smithsonian Tropical Research Institute (Ancón, Panamá) and University of the Andes (Bogotá, Colombia) who we (the Summer 2014 PCP PIRE intern crew) joined a month ago in the Azuero Peninsula of southwestern Panama for a geological mapping field course. Based in the small coastal town of Torio, we went on daily excursions to different localities seeking new geological knowledge about this relatively unexplored (geologically speaking) region of Panama. For more on this trip, please check out the upcoming June/July PCP PIRE eNewsletter.
I’m a vertebrate zoologist by training, with only a small geology background (mostly involving laboratory methods and samples), so learning field geology skills such how to use a Jacob’s Staff and Brunton Compass as well as how to measure and describe stratigraphic sections with in-field hand samples and rock outcrops through this experience were very beneficial to me as a developing interdisciplinary scientist. I also collected my first plant and invertebrate fossils from the Neotropics along Torio Beach, including some complete fossil seeds and sea urchins!
During my time in Azuero, I made several new Colombian friends, improved my Spanish language skills, and went on many adventures (some quite harrowing) that I won’t soon forget.
Perhaps the day in Azuero that will stick in my memory the longest was when myself, two University of the Andes students, and their instructor followed a local Panamanian guide down the gullet of Rio Torio in search of a geologic contact between Cretaceous limestone and basalt. We trekked/hacked our way through the tropical rainforest on seldom-used, overgrown paths in order to reach the river, and walked/waded upstream from there. We had numerous encounters with rapids and waterfalls, which sometimes required leaving the river to climb around these obstacles on steep, slippery limestone cliffs and boulders; sometimes, however, we went right through or fell into the rapids (and got a thorough soaking in the process). We stopped periodically at rock outcrops along the riverbanks to hammer out some hand samples to inspect with our hand lenses, but kept going through the river laced with slippery limestone and rainforest on either side. After reaching the calmer headwaters of the river, we left it behind and hiked up mountain cow pastures to one of the tallest points in the region, in order to get a better view of our surroundings and consult our topographic maps. It was one of the most beautiful sights I’ve ever seen, looking across the landscape of green rolling hills, rivers, beaches, and the Pacific Ocean. I was completely exhausted, but had to recover quickly for the harrowing return trip down from our high vantage point and back through Rio Torio – this time in the middle of a torrential downpour which infused the river with energy and clouded it with sediment…
From wading through raging rivers and hiking up mountains searching for rock outcrops, to racing the rising tides to collect fossils along the beach, all in the company of new international friends and colleagues, my Azuero experience was unforgettable.