daa906 Posted February 21, 2018 Share Posted February 21, 2018 Hey guys! I haven’t posted in a very very long time but I came across this in my journeys and have never found or seen one before. Any ideas? Found in the Lincoln creek formation of Washington state. It is about 1 1/2” Link to comment Share on other sites More sharing options...
fossisle Posted February 21, 2018 Share Posted February 21, 2018 Looks like a sea urchin 1 Cephalopods rule!! Link to comment Share on other sites More sharing options...
FossilDAWG Posted February 21, 2018 Share Posted February 21, 2018 I agree with fossile, it is an echinoid or the impression of one. The "arms" of the "starfish" are the ambulacra of the echinoid. Don Link to comment Share on other sites More sharing options...
daa906 Posted February 21, 2018 Author Share Posted February 21, 2018 I can see what you are talking about, this is the positive side of the fossil. The fossil is 3D rather than an impression. There was a concretion on top of this that was weathered and fell apart. I do see how it looks like a sea urchin though. Link to comment Share on other sites More sharing options...
daa906 Posted February 21, 2018 Author Share Posted February 21, 2018 The fossil is sitting inside of the impression rather than an imprint of a fossil if that makes sense. Link to comment Share on other sites More sharing options...
Wrangellian Posted February 21, 2018 Share Posted February 21, 2018 The whole cavity including what you see as 'arms' is (or was) an echinoid/sea urchin, it was not a concretion that dissolved out. The body (shell) would have been a biscuit-shaped thing with 5 'petals' on its top surface, called ambulacra. Nice specimen even if it is just an impression/negative/mold. Link to comment Share on other sites More sharing options...
caldigger Posted February 21, 2018 Share Posted February 21, 2018 Here's a couple more off Google to give you a better idea of the patterning. Link to comment Share on other sites More sharing options...
Phevo Posted February 21, 2018 Share Posted February 21, 2018 Here's a Linthia sp. for comparison ca. 63 myo Link to comment Share on other sites More sharing options...
daa906 Posted February 21, 2018 Author Share Posted February 21, 2018 Ah, that last picture with the ambulacra indented into the urchin definitely shows that it is indeed an urchin. Thank you! I wish the actual body had stayed intact. It completely disintegrated when I picked it up. It did look like a concretion though. I find many concretions where I found this. Very first sea urchin I have ever found there. Mostly Pulalius vulgaris in that area. Link to comment Share on other sites More sharing options...
fossisle Posted February 21, 2018 Share Posted February 21, 2018 You could make a nice positive by filling the depression in with latex or dental compound. Cephalopods rule!! Link to comment Share on other sites More sharing options...
oldtimer Posted February 21, 2018 Share Posted February 21, 2018 Nice find for the area you are hunting in. Link to comment Share on other sites More sharing options...
Al Dente Posted February 21, 2018 Share Posted February 21, 2018 Sometimes a reversed image will bring out more details of moldic fossils. 3 Link to comment Share on other sites More sharing options...
.thumb.jpg.51c371f10936bbc883322324e44cc518.jpg)
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now