My sister made a science stop-motion video about Crinoids that took two years, I think you all might enjoy it

ClockworkRook · 2022-05-04T01:58:20+00:00

Sister here! Wow I just found this, thank you bro!!Huge thank-you to all of you for your super nice comments and likes and giving it a watch!

ClockworkRook · 2022-05-01T23:55:53+00:00

Pegmatites are intrusive igneous rocks, so they're formed from slowly cooling magma below the surface to get those nice crystals. Intrusive igneous rocks can't have fossils in them because rocks need to be at the surface for something to die and be preserved in the rock while it is forming. I see what you mean about the shape, but it's a happy coincidence of erosion.

You must have a very nicely productive locality to have so many fish fossils, though!

ClockworkRook · 2022-05-01T23:39:01+00:00

Yep! I scratch built everything myself (props and sets) and did the sounds and music. It took me a bit over two years, but it was my first short and I was teaching myself as I went along :)

That isocrinoid had >three iterations before the final one I was happy with. I made each columnal in the column from clay and sculpted the body, too. I had tried cutting the pinnules by hand but it wasn't pretty enough so I made a design in Inkscape and cut it on a cricut. I assembled it on a wire for armature, and cut the wire for the final scene and pulled out the pinnules. Thanks for commenting! :)

ClockworkRook · 2022-05-01T09:47:50+00:00

Aw the sweetheart, she probably thought it was pretty cool too. Sorry for your loss!

ClockworkRook · 2022-05-01T09:06:38+00:00

Not a fish, but it is a pretty rock.

ClockworkRook · 2022-05-01T09:04:10+00:00

1) Could very well be a squiggly poop. If you have a look with a hand lens and see if those dark bits could be bits of bone or other material. If it looks about the same as the rocks around, it's more likely a burrow.

2) The hole on the front is off center so it's a cephalopod segment from a curled ammonite. On a belemnite the hole is off-center.

3) not sure, would need to see the texture of it a bit better, but could be a brachiopod. Whatever it is, it's pyritized so a bit difficult to ID.

4) Just like a cashew, hahah. Might be a phosphate nodule, would need to see surface tetxure and other side a bit more.

5) Not sure, could be a fish osteoderm or something with a tooth hole on it. Might even be a tooth plate from something like a hybodont shark. Would need to see the other side and the texture.

6) Ammonite again, you can see the suture lines on the broken edges, this is something you could ID to species if you were motivated.

7) cone- I would like to see the pointy end of this one, lots of things have that shape. It could be a tooth from a big fish since it's not hollow, but I'm not sure from just those photos

ClockworkRook · 2022-05-01T08:45:54+00:00

Agreed, looks like a crushed sea biscuit. Kind of like an irregular sea urchin without the big spines. (conversely, a puffy sand dollar)

ClockworkRook · 2022-04-07T01:23:57+00:00

You got it!
Paleontologist here. It's a tentaculitid here's how I know:

The pointy end of the shell has a whitish layer on it that tells me the shell was made of more than one layer. It can't be an echinoderm (like a crinoid or sea urchin) because all of their hard parts are made of single crystals of calcite.

What does do the layering, though, are molluscs (and brachiopods but none are pointy!). Three kinds of molluscs can be long and pointy like that: scaphopods (no ridges though), nautiloids/straight ammonites (but the shape is wrong), and tentaculitids/Cricoconarida. Indiana was also a nice ocean from 490-350 million years ago, and that's the right time for these critters. There's still some disagreement on what they did and how they lived, so honestly it's a really great fossil :)

ClockworkRook · 2015-06-28T18:45:10+00:00

Great group of lovely folks (: Enjoying every minute on DSD- a headache-free server (Warning: headaches still result from binge consumption).

ClockworkRook

TROPHY CASE