PRK Posted October 31, 2013 Share Posted October 31, 2013 (edited) As I've mentioned before, a while back a friend gave me his fathers rock/fossil collection. This piece was in in it, with absolutely no info. I do realize it is Paleozoic sea urchin plate, with not much prep. Im not a Paleozoic guy, so could anyone help me out with some more info? Actually I have the same info and questions about these crinoids. Edited November 1, 2013 by PRK Link to comment Share on other sites More sharing options...
piranha Posted October 31, 2013 Share Posted October 31, 2013 I'd guess Archaeocidaris for the echinoid spines. Link to comment Share on other sites More sharing options...
Auspex Posted October 31, 2013 Share Posted October 31, 2013 The crinoids don't seem to have much fine detail; almost like a cast. Is this the preservation, the preparation, or the picture? "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Herb Posted October 31, 2013 Share Posted October 31, 2013 (edited) The spine plate is very cool The crinoids look almost artificial, as Auspex mentioned. Or, the matrix is really soft. Edited October 31, 2013 by Herb "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
PRK Posted November 1, 2013 Author Share Posted November 1, 2013 The crinoid plate is authentic, very hard limestone. As I said-- I have no info about these pieces. I'm int in, age, location, etc. even what? Link to comment Share on other sites More sharing options...
Ludwigia Posted November 1, 2013 Share Posted November 1, 2013 If the sea urchin plate was Mesozoic, then I'd check out the site in Landaville, Vosges, France. Upper Bajocian. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Coco Posted November 1, 2013 Share Posted November 1, 2013 Hi, I'd guess Archaeocidaris for the echinoid spines. Archaeocidaris brownwoodensis has no smooth thorn. I do not know if there is another species of Archaeocidaris... If the sea urchin plate was Mesozoic, then I'd check out the site in Landaville, Vosges, France. Upper Bajocian. I once went to Landaville (France). All the plates with sea urchins which I saw showed numerous whole sea urchins there, with thorns. I doubt that this plate comes of over there. Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
piranha Posted November 1, 2013 Share Posted November 1, 2013 Hi, Archaeocidaris brownwoodensis has no smooth thorn. I do not know if there is another species of Archaeocidaris... I once went to Landaville (France). All the plates with sea urchins which I saw showed numerous whole sea urchins there, with thorns. I doubt that this plate comes of over there. Coco Hi Coco, Archaeocidaris can have smooth, striate or spinulose spines. Three different species are attached for comparison. A. apheles, A. aliquantula, A. whatleyensis This LINK has images of Archaeocidaris aliquantula from Gilmore City, Iowa that look similar to the posted example. 1 Link to comment Share on other sites More sharing options...
PRK Posted November 1, 2013 Author Share Posted November 1, 2013 OK. Cf. Iowa, eh. As I said I'm no Paleozoic, so your guess is better than mine. How old? Even a guess. Link to comment Share on other sites More sharing options...
Coco Posted November 2, 2013 Share Posted November 2, 2013 Hi, Thanks Piranha ! Furthermore, Echinologia is the first forum on which I joined ! I would have had to think of it ! Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
Scylla Posted November 2, 2013 Share Posted November 2, 2013 I think Gilmore city is Mississippian, but I'm no expert either. Link to comment Share on other sites More sharing options...
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