David Clark
@clarkeocrinus.bsky.social
I'd rather be crinoid hunting.
Invertebrate enthusiast, Paleo artist, Fossil prep, President of Friends of the University of Michigan Museum of Paleontology
Invertebrate enthusiast, Paleo artist, Fossil prep, President of Friends of the University of Michigan Museum of Paleontology
This Plumulites is an Ordovician aged armored annelid worm. This specimen is from the upper Fezouata formation of Morocco. It's about 50 mm or 2 inches long.
#FossilFriday
#FossilFriday
February 13, 2026 at 11:57 PM
This Plumulites is an Ordovician aged armored annelid worm. This specimen is from the upper Fezouata formation of Morocco. It's about 50 mm or 2 inches long.
#FossilFriday
#FossilFriday
I have a new friend for my salt water tank.
My original brittle star lived for about 6 years before it passed recently.
It didn't feel right without an echinoderm in my tank.
My original brittle star lived for about 6 years before it passed recently.
It didn't feel right without an echinoderm in my tank.
February 8, 2026 at 1:25 AM
I have a new friend for my salt water tank.
My original brittle star lived for about 6 years before it passed recently.
It didn't feel right without an echinoderm in my tank.
My original brittle star lived for about 6 years before it passed recently.
It didn't feel right without an echinoderm in my tank.
I got buzzed by a Pileated Woodpecker as I was refiling the suet in the bird feeder. We've seen it a few times this winter, but they are rare to see. It's huge! Probably 12 inches long.
We get Downy and Red Bellied woodpeckers every day.
This was special to see.
We get Downy and Red Bellied woodpeckers every day.
This was special to see.
February 8, 2026 at 12:06 AM
I got buzzed by a Pileated Woodpecker as I was refiling the suet in the bird feeder. We've seen it a few times this winter, but they are rare to see. It's huge! Probably 12 inches long.
We get Downy and Red Bellied woodpeckers every day.
This was special to see.
We get Downy and Red Bellied woodpeckers every day.
This was special to see.
January 31, 2026 at 2:27 AM
This was another unlabeled piece, but I plan to search for an ID.
It's a very strange echinoderm with 4 swirling ridges to the mouth.
It feels like an Ordovician cystoid, but I really don't know.
I would love to hear if anyone has ideas.
#FossilFriday
It's a very strange echinoderm with 4 swirling ridges to the mouth.
It feels like an Ordovician cystoid, but I really don't know.
I would love to hear if anyone has ideas.
#FossilFriday
January 30, 2026 at 4:00 PM
This was another unlabeled piece, but I plan to search for an ID.
It's a very strange echinoderm with 4 swirling ridges to the mouth.
It feels like an Ordovician cystoid, but I really don't know.
I would love to hear if anyone has ideas.
#FossilFriday
It's a very strange echinoderm with 4 swirling ridges to the mouth.
It feels like an Ordovician cystoid, but I really don't know.
I would love to hear if anyone has ideas.
#FossilFriday
I usually stick to echinoderms, but this insect was so stunning.
This is a Cretaceous aged Neuropterid insect, Hemerobidae sp.
#FossilFriday
This is a Cretaceous aged Neuropterid insect, Hemerobidae sp.
#FossilFriday
January 30, 2026 at 3:53 PM
I usually stick to echinoderms, but this insect was so stunning.
This is a Cretaceous aged Neuropterid insect, Hemerobidae sp.
#FossilFriday
This is a Cretaceous aged Neuropterid insect, Hemerobidae sp.
#FossilFriday
Here's a closer view of the trilobite rusophycus resting spot and the starfish trace right next to it.
#FossilFriday
#FossilFriday
January 30, 2026 at 3:50 PM
Here's a closer view of the trilobite rusophycus resting spot and the starfish trace right next to it.
#FossilFriday
#FossilFriday
This is another really cool trace fossil, but unfortunately there was no label, so I don't know where it's from.
There is a trilobite resting spot and at least two starfish trace fossils.
#FossilFriday
There is a trilobite resting spot and at least two starfish trace fossils.
#FossilFriday
January 30, 2026 at 3:48 PM
This is another really cool trace fossil, but unfortunately there was no label, so I don't know where it's from.
There is a trilobite resting spot and at least two starfish trace fossils.
#FossilFriday
There is a trilobite resting spot and at least two starfish trace fossils.
#FossilFriday
The label said this is a Pennsylvanian aged trilobite track from the Hale Formation of Arkansas.
I've never seen a trilobite or track from Pennsylvanian aged Arkansas. Trilobites would be extinct at the end of the Permian.
#FossilFriday
I've never seen a trilobite or track from Pennsylvanian aged Arkansas. Trilobites would be extinct at the end of the Permian.
#FossilFriday
January 30, 2026 at 3:46 PM
The label said this is a Pennsylvanian aged trilobite track from the Hale Formation of Arkansas.
I've never seen a trilobite or track from Pennsylvanian aged Arkansas. Trilobites would be extinct at the end of the Permian.
#FossilFriday
I've never seen a trilobite or track from Pennsylvanian aged Arkansas. Trilobites would be extinct at the end of the Permian.
#FossilFriday
I finally have a nice LeGrand crinoid piece.
This Mississippian aged site in Iowa is famous for crinoids with preserved color. The darker crinoid is Rhodocrinites kirbyi and the lighter one is Platycrinites symmetricus.
#FossilFriday
This Mississippian aged site in Iowa is famous for crinoids with preserved color. The darker crinoid is Rhodocrinites kirbyi and the lighter one is Platycrinites symmetricus.
#FossilFriday
January 30, 2026 at 3:41 PM
I finally have a nice LeGrand crinoid piece.
This Mississippian aged site in Iowa is famous for crinoids with preserved color. The darker crinoid is Rhodocrinites kirbyi and the lighter one is Platycrinites symmetricus.
#FossilFriday
This Mississippian aged site in Iowa is famous for crinoids with preserved color. The darker crinoid is Rhodocrinites kirbyi and the lighter one is Platycrinites symmetricus.
#FossilFriday
He must be related to this football player.
January 29, 2026 at 2:26 PM
He must be related to this football player.
Monday morning feels.
January 26, 2026 at 2:48 PM
Monday morning feels.
Just going to hibernate today and stay away from people.
I'm not ok.
I don't know how this gets better.
I'm not ok.
I don't know how this gets better.
January 25, 2026 at 4:03 PM
Just going to hibernate today and stay away from people.
I'm not ok.
I don't know how this gets better.
I'm not ok.
I don't know how this gets better.
I don't have a good ID for the snail. It's just listed as Platyceratid in Strimple's publication on this locality.
January 21, 2026 at 2:09 AM
I don't have a good ID for the snail. It's just listed as Platyceratid in Strimple's publication on this locality.
It looks like a Stellarocrinus from the Pennsylvanian Bond Fm., LaSalle Limestone Mb. near Pontiac, Illinois.
I have a few from there. Typically white color preservation.
I love the snail on your specimen.
I have a few from there. Typically white color preservation.
I love the snail on your specimen.
January 20, 2026 at 10:15 PM
It looks like a Stellarocrinus from the Pennsylvanian Bond Fm., LaSalle Limestone Mb. near Pontiac, Illinois.
I have a few from there. Typically white color preservation.
I love the snail on your specimen.
I have a few from there. Typically white color preservation.
I love the snail on your specimen.
Jimbacrinus is a really strange, alien looking crinoid. Permian aged crinoids are uncommon. These are from Australia.
Keep creating and sharing your art.
#FossilFriday #SciArt
Keep creating and sharing your art.
#FossilFriday #SciArt
January 17, 2026 at 1:57 AM
Jimbacrinus is a really strange, alien looking crinoid. Permian aged crinoids are uncommon. These are from Australia.
Keep creating and sharing your art.
#FossilFriday #SciArt
Keep creating and sharing your art.
#FossilFriday #SciArt
It's a very pretty bird though.
Doing my part to keep it fed and warm on this cold day.
Doing my part to keep it fed and warm on this cold day.
January 16, 2026 at 8:54 PM
It's a very pretty bird though.
Doing my part to keep it fed and warm on this cold day.
Doing my part to keep it fed and warm on this cold day.
I haven't figured out why a red bellied woodpecker doesn't have a red belly. The only red is on its head.
January 16, 2026 at 8:54 PM
I haven't figured out why a red bellied woodpecker doesn't have a red belly. The only red is on its head.
I use micro abrasive powder. It's like a sand blaster, but with powdered limestone.
January 16, 2026 at 7:21 PM
I use micro abrasive powder. It's like a sand blaster, but with powdered limestone.
The 4th crinoid on the plate is Rhodocrinites (wortheni?)
The ornamentation on the calyx is really beautiful.
#FossilFriday
The ornamentation on the calyx is really beautiful.
#FossilFriday
January 16, 2026 at 6:50 PM
The 4th crinoid on the plate is Rhodocrinites (wortheni?)
The ornamentation on the calyx is really beautiful.
#FossilFriday
The ornamentation on the calyx is really beautiful.
#FossilFriday
This is Cribanocrinus watersianus. This crinoid had 20 arms filtering the water for food.
#FossilFriday
#FossilFriday
January 16, 2026 at 6:50 PM
This is Cribanocrinus watersianus. This crinoid had 20 arms filtering the water for food.
#FossilFriday
#FossilFriday
January 16, 2026 at 6:50 PM
January 16, 2026 at 6:50 PM
This is a nice plate of crinoids I picked up unprepped at a fossil show for $8. It was in a "junk box" and I could only see 2 of the 4 crinoids.
It turned out pretty nice.
It's from the Mississippian Gilmore City Fm. of Iowa. Four unique species of crinoids.
#FossilFriday
It turned out pretty nice.
It's from the Mississippian Gilmore City Fm. of Iowa. Four unique species of crinoids.
#FossilFriday
January 16, 2026 at 6:50 PM
This is a nice plate of crinoids I picked up unprepped at a fossil show for $8. It was in a "junk box" and I could only see 2 of the 4 crinoids.
It turned out pretty nice.
It's from the Mississippian Gilmore City Fm. of Iowa. Four unique species of crinoids.
#FossilFriday
It turned out pretty nice.
It's from the Mississippian Gilmore City Fm. of Iowa. Four unique species of crinoids.
#FossilFriday