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Brad Warne posted a new specimen in the group What is it? from the myFOSSIL app 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months agoBrad Warne has contributed specimen mFeM 83534 to myFOSSIL!
Brad Warne posted a new specimen in the group What is it? from the myFOSSIL app 3 years, 7 months ago
Brad Warne has contributed specimen mFeM 83534 to myFOSSIL!
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The wider section with the concave ends are remnants of an orthocone (used to be called Orthoceras but thats a wastebasket taxon). Crinoid stems are usually flat, with some features that reveal their 5-pointed radial symmetry and a hole (axial canal) in the center. Not sure about the long thin section. It could be the rest of the orthocone that…[Read more]
Wow. Very interesting. I have an orthocone found from this same creek about thirty years ago.
You’ll notice that I’ve been hacking away at the fossil with a dremel tool to expose most of what you see. I accidentally made a small hole on the section you suggest is an orthocone. The fact that it’s hollow would further suggest the hollow chambers of a cephalopod.
Thank you @patrick-hsieh
But where is the siphuncle in the top down view?
Now that I see it as an orthocone, I think that the long narrow bit is the siphuncle and rest of the cone has broken away.
Yes, I think you’re right! In fact, on page 530 of my copy of Shimer and Shrock’s Index Fossils of North America, (1965 printing), there is a picture of a specimen with the siphuncle and partial camerae preserved just like your specimen.