What You Need to Know Before You Start
Paleontology is like detective work, but instead of solving crimes, you’re piecing together stories from millions of years ago. In this guide, you’ll learn how scientists identified a bizarre 275-million-year-old creature with a twisted jaw—a truly unique find from a dried-up riverbed in Brazil. Follow the steps below to understand the process behind the discovery of Tanyka amnicola, an animal that defied extinction.
What You Need (Materials & Prerequisites)
- Fossil site location – A known or suspected fossil-bearing rock formation (e.g., a dried riverbed in Brazil).
- Field tools – Rock hammer, chisels, brushes, GPS, safety goggles, and a field notebook.
- Laboratory equipment – Microscope, CT scanner, and dissolution chemicals (for rock matrix removal).
- Comparative collection – Database of known prehistoric animals and their jawbone characteristics.
- Radiometric dating resources – Access to uranium-lead or argon-argon dating techniques.
- Phylogenetic analysis software – Programs like PAUP or MrBayes for evolutionary tree building.
- Research literature – Published papers on Permian tetrapods and “living fossils.”
Step‑by‑Step Guide to Discovering and Classifying a Twisted‑Jaw Prehistoric Animal
Step 1: Locate a Promising Fossil Site
Begin by surveying geological maps and satellite images of regions with exposed Permian strata. In this case, the dried-up riverbed in Brazil’s interior offered the perfect opportunity. Look for sedimentary rocks formed in ancient river or lake environments—these often preserve complete skeletons. Use a GPS to mark coordinates of any bone fragments, especially those that appear to be from the head or jaw area.
Step 2: Excavate the Specimen with Care
Once you spot bone protrusions, carefully remove loose sediment using brushes and hand tools. For fragile or twisted jawbones, use a rock hammer and chisel around the specimen to isolate it in a protective plaster jacket. Tanyka amnicola’s twisted jaw was found in several pieces, requiring meticulous extraction. Document the orientation of each bone using photographs and sketches before lifting.
Step 3: Clean and Prepare the Fossil in the Lab
Back in the laboratory, soak the fossil blocks in mild acid or use fine air scribes to remove the enclosing rock matrix. Under a microscope, slowly expose the jawbones’ unique structure. Notice how the lower jaw of Tanyka is twisted nearly 90 degrees relative to the upper jaw—a feature not seen in any living animal. Take high‑resolution CT scans to visualize internal cavities without damaging the original fossil.
Step 4: Date the Rock Layers Containing the Fossil
Collect samples of volcanic ash or minerals from the same sedimentary horizon as the jawbones. Use radiometric dating (e.g., uranium‑lead on zircon crystals) to determine the absolute age. The results for the Brazilian site indicated an age of 275 million years, placing it in the early Permian Period. This step is crucial to confirm the creature lived far later than its ancestral lineage would suggest.
Step 5: Compare With Known Species and Build the Evolutionary Tree
Input measurements and CT‑derived data of the twisted jaw into phylogenetic analysis software alongside other prehistoric tetrapods. The twisted structure closely matches that of a group called parareptiles that largely died out 300 million years ago. Tanyka amnicola fit as a late‑surviving member of that group. The unexpected presence of such an ancient form made it a “living fossil” of its time—a relic from a long‑lost evolutionary branch.
Step 6: Publish and Name the New Species
After confirming the specimen is a new species, assign a scientific name: Tanyka amnicola (the first part honors the location, the second means “river dweller”). Write a peer‑reviewed paper describing the twisted jaw and its evolutionary implications. Include clear diagrams and CT reconstructions. This step finalizes the discovery process, sharing it with the scientific community.
Tips for a Successful Paleontological Investigation
- Always document the excavation site thoroughly. Even small details (like the orientation of a tooth) can reveal how the animal fed or moved.
- Don’t rush cleaning. The twisted jaw of Tanyka was fragile; patience preserves unique structures.
- Double‑check dating samples. Contaminated ash can give false ages—use multiple mineral types to cross‑verify.
- Look beyond the visible. CT scans can reveal hidden fractures or asymmetries that explain the jaw twist.
- Consult experts in living fossils. Compare with primitive reptiles like tuataras to understand how ancient lineages can persist.
- Prepare for surprises. Sometimes the most bizarre features (like a 90‑degree jaw twist) turn out to be adaptions for feeding on specific prey—stay open to hypotheses.
Now you understand how scientific deduction turned a few twisted bones into a window onto a lost world. Follow these steps, and you too could uncover the next “living fossil.”