Bess Posted June 16, 2019 Share Posted June 16, 2019 Hello. My siblings and I have found several disk shaped objects in a park in Hamilton, Nj. We have grouped them into two main categories. One has more than 5 sections around the center of the object and the other has 5 or less sections. I will post the first category in this thread and the other one some time later. The rock in this area is mainly from the Jurassic and Cretaceous, but there is a small segment of rock from the Cambrian. Some of the objects in the first category seem to have the disk slightly burrowed into the surrounding rock. The objects in this category also have a smaller disc in the center of the larger one. I hope that you can identify two subjects. Thank you in advance. Sorry for poor photo quality. Link to comment Share on other sites More sharing options...
Bess Posted June 16, 2019 Author Share Posted June 16, 2019 Here is one more picture of a different sample. It is around 2-3mm. Link to comment Share on other sites More sharing options...
caldigger Posted June 16, 2019 Share Posted June 16, 2019 These are crinoid imprints. Sample of such... Link to comment Share on other sites More sharing options...
Bess Posted June 16, 2019 Author Share Posted June 16, 2019 Thank you for the reply. Link to comment Share on other sites More sharing options...
FossilNerd Posted June 17, 2019 Share Posted June 17, 2019 Agreed. Crinoid imprints. Probably from a piece of stem. Here is a quick pic of a piece (columnal) I had laying around. Nothing fancy, but you can see the radial lines and the center hole that if pressed down like a stamp would cause the impressions you have. The good thing about science is that it's true whether or not you believe in it. -Neil deGrasse Tyson Everyone you will ever meet knows something you don't. -Bill Nye (The Science Guy) Link to comment Share on other sites More sharing options...
The Jersey Devil Posted June 17, 2019 Share Posted June 17, 2019 The rock to the left on your second from last pic looks like typical glacial washout that’s found in Monmouth Co. brooks. It is Silurian/Devonian age and I agree it is a crinoid. “You must take your opponent into a deep dark forest where 2+2=5, and the path leading out is only wide enough for one.” ― Mikhail Tal Link to comment Share on other sites More sharing options...
Bess Posted June 17, 2019 Author Share Posted June 17, 2019 Thank you for your replies. Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted June 17, 2019 Share Posted June 17, 2019 Definitely crinoid stem sections. Google crinoid and check out the images. Many different species. Mark. Fossil hunting is easy -- they don't run away when you shoot at them! Link to comment Share on other sites More sharing options...
Bess Posted June 17, 2019 Author Share Posted June 17, 2019 Thanks for the reply. I agree that these are from Crinoid stems. Link to comment Share on other sites More sharing options...
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