Crinoid Queen Posted January 19, 2009 Share Posted January 19, 2009 If any one can help me ID these would be much appriciated. thanx for help Debbie Link to comment Share on other sites More sharing options...
Archimedes Posted January 19, 2009 Share Posted January 19, 2009 The second photo is an Actinocrinus, a very beautiful crown, and if I was to guess believe it is A. multiradiatus. I know what the first photo is but the name escapes me right now. What formation are these from in the lower Mississippian Period? Actinocrinites Miller, 1821 is now the accepted genus Link to comment Share on other sites More sharing options...
Crinoid Queen Posted January 19, 2009 Author Share Posted January 19, 2009 The second photo is an Actinocrinus, a very beautiful crown,and if I was to guess believe it is A. multiradiatus. I know what the first photo is but the name escapes me right now. What formation are these from in the lower Mississippian Period? yes they are from the mississipian bed from Crawfordsville IN Link to comment Share on other sites More sharing options...
Crinoid Queen Posted January 19, 2009 Author Share Posted January 19, 2009 yes they are from the mississipian bed from Crawfordsville IN The only two of that genus we can find here according to my list is gibsoni and magnificus. I have looked at pics of both of them and amdont think it matches either it has a strange extension from the calix b4 the arms start. The arms are bunched neither of those two display that the calixs match but that detail is off????? thanx Link to comment Share on other sites More sharing options...
Archimedes Posted January 19, 2009 Share Posted January 19, 2009 The only two of that genus we can find here according to my list is gibsoni and magnificus. I have looked at pics of both of them and amdont think it matches either it has a strange extension from the calix b4 the arms start. The arms are bunched neither of those two display that the calixs match but that detail is off?????thanx The first Pic i believe is a Histocrinus coreyi, they are common at crawfordsville calyx ornamentation varies a lot from specimen to specimen, even in specimens found grouped together. many times its tough to determine the species if you do not know the formation they come from. Link to comment Share on other sites More sharing options...
Crinoid Queen Posted January 19, 2009 Author Share Posted January 19, 2009 The first Pic i believe is a Histocrinus coreyi, they are common at crawfordsvillecalyx ornamentation varies a lot from specimen to specimen, even in specimens found grouped together. many times its tough to determine the species if you do not know the formation they come from. they r missisipian formation Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted January 19, 2009 Share Posted January 19, 2009 ^^That is the period in which the rocks were deposited. He was referring to the rock formation, or better yet, the member. See this strat column for the Miss of Indiana. Link to comment Share on other sites More sharing options...
Crinoid Queen Posted January 19, 2009 Author Share Posted January 19, 2009 ^^That is the period in which the rocks were deposited. He was referring to the rock formation, or better yet, the member. See this strat column for the Miss of Indiana. No way of knowing that unfortunatly they r not excavated from a dig they r just found loose in the creek. Know idea what layer if strata they r from sry. Link to comment Share on other sites More sharing options...
Archimedes Posted January 20, 2009 Share Posted January 20, 2009 Hi CQ The proper genus name is Actinocrinites Miller, 1821, after looking at Wachsmuth and Springer, 1897, believe it is properly refered to Actinocrinites magnificus (Wachsmuth and Springer, 1897) There is a great deal of liturature on the crawfordsville crinoids you can look up, Most of the crinoids are from the Edwardsville Fm. , Borden Group The calyx and arm stucture you described, "strange extension from the calix b4 the arms start" are diagnostic characters of Actinocrinites Miller, 1821 Link to comment Share on other sites More sharing options...
Crinoid Queen Posted January 22, 2009 Author Share Posted January 22, 2009 Ok heres another one i think i have made an ID. It is a scytalocrinus robustus? what do you all think? Thanx, Debbie Link to comment Share on other sites More sharing options...
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