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Bull Canyon Microfossils


ThePhysicist

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I got many bags of micromatrix to sift through over the Summer, one of them being from the Bull Canyon Formation, which is Late Triassic in age (~227-208.5 Ma). As has been said many times before, not much is known about the teeth that can be found here, unfortunately. 

 

The vast majority of fossils that I've found so far are fish scales, lots of fish scales. I've found a few teeth, serrated and non-serrated (mostly partial), a couple of tooth plates/jaw fragments, and random chunks of bone. 

 

The matrix is about medium grain size. For scale, the sorting dish I'm using has 1 cm squares. Most of the rock is a red color, and the fossils are almost entirely white.

 

IMG_1464.thumb.jpeg.c4061bd2237c20301a93c791c9308578.jpeg 

 

Here are couple of "in situ" shots:

 

Jaw section (fish?):

IMG_1469.thumb.jpeg.a5aba7ac5d1232057be217924c470c59.jpeg

 

Tooth plate (also fish?):

IMG_1465.thumb.jpeg.43230bd75be773e2f0a15eda13c65b42.jpeg

 

Serrated tooth fragment:

261664249_IMG_14622.thumb.jpeg.8ad250a5d1f234e499bc73b0f5b1e10e.jpeg

 

Non-serrated, striated tooth fragment (amphibian?):

IMG_1467.thumb.jpeg.e97ba3bf24358e805c901b92fcd77055.jpeg

 

A nearly complete serrated tooth!:

IMG_1468.thumb.jpeg.58e1cbde0686ac7065332fec567172dc.jpeg

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"Argumentation cannot suffice for the discovery of new work, since the subtlety of Nature is greater many times than the subtlety of argument." - Carl Sagan

"I was born not knowing and have had only a little time to change that here and there." - Richard Feynman

 

Collections: Hell Creek Microsite | Hell Creek/Lance | Dinosaurs | Sharks | SquamatesPost Oak Creek | North Sulphur RiverLee Creek | Aguja | Permian | Devonian | Triassic | Harding Sandstone

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Another conical, striated tooth:

IMG_1484.thumb.jpeg.788001f5559ce99c5b017d9623924e7b.jpeg

 

A fish scale with some interesting structure inside:

IMG_1482.thumb.jpeg.5e9450c039c2441928d5daa2341ef2bf.jpeg

 

A revueltosaurid tooth?:

IMG_1481.thumb.jpeg.52a82901f81910954b88f566792033b8.jpeg

 

Compressed, serrated tooth:

IMG_1485.thumb.jpeg.6ef4593addf89d39f335dd08c575041e.jpeg

 

Selected, nicer fish scales:

IMG_1491.thumb.jpeg.4e97ee5d16f2bb2418bcafc6b881d5bd.jpeg

 

"Revueltosaurid" teeth are bulbous, striated, and serrated:

IMG_1489.thumb.jpeg.1299fc58ece49bdeaf9feeea186f0ebf.jpeg

 

I have no idea what these are, but they are rounded/oval in cross section, have smooth enamel, and have serrations more evident on the distal carina that lean towards the tip:

IMG_1490.thumb.jpeg.a11541a269dbf30a76c05a09b0987aaf.jpeg

 

These teeth I think are the best candidates for theropod teeth. They're very compressed with fine serrations, and though incomplete, hint at recurvature:

IMG_1488.thumb.jpeg.2f2bac03daad48aed08817a6ac0c7ceb.jpeg

"Argumentation cannot suffice for the discovery of new work, since the subtlety of Nature is greater many times than the subtlety of argument." - Carl Sagan

"I was born not knowing and have had only a little time to change that here and there." - Richard Feynman

 

Collections: Hell Creek Microsite | Hell Creek/Lance | Dinosaurs | Sharks | SquamatesPost Oak Creek | North Sulphur RiverLee Creek | Aguja | Permian | Devonian | Triassic | Harding Sandstone

Instagram: @thephysicist_tff

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