JUAN EMMANUEL Posted May 10, 2017 Share Posted May 10, 2017 I found this crinoid head on a limestone that belongs to the Georgian Bay Formation, late Ordovician, today at the Humber River in Toronto, Ontario. Is this crinoid a Cincinnaticrinus or a Glyptocrinus? I have included a nickel for size reference. Link to comment Share on other sites More sharing options...
JUAN EMMANUEL Posted May 10, 2017 Author Share Posted May 10, 2017 The entire slab as I found it on the ground. There are other crinoid stems on the slab. 2 Link to comment Share on other sites More sharing options...
FossilDAWG Posted May 10, 2017 Share Posted May 10, 2017 That is an excellent and very rare find. It is definitely not a Glyptocrinus, as those crinoids had pinnulate (feather-like) arms. There are a number of crinoids illustrated in Foerste's volume on the Upper Ordovician Faunas of Ontario and Quebec. You should check there for a possible ID, bearing in mind that many generic names have changed since the early 1900s. Don 5 Link to comment Share on other sites More sharing options...
Fossildude19 Posted May 10, 2017 Share Posted May 10, 2017 Awesome looking plate! Thanks for posting it. Well done. Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
MSirmon Posted May 10, 2017 Share Posted May 10, 2017 Amazing slab. Thank you for sharing Link to comment Share on other sites More sharing options...
Monica Posted May 10, 2017 Share Posted May 10, 2017 Beautiful!!! Link to comment Share on other sites More sharing options...
Northern Sharks Posted May 10, 2017 Share Posted May 10, 2017 I don't know the GB formation well, but is Cupulocrinus present? There's no limit to what you can accomplish when you're supposed to be doing something else Link to comment Share on other sites More sharing options...
westcoast Posted May 10, 2017 Share Posted May 10, 2017 That is a really nice find! Link to comment Share on other sites More sharing options...
JUAN EMMANUEL Posted May 10, 2017 Author Share Posted May 10, 2017 Here's some other parts: This stem has a spiral to it. Does this mean this crinoid used it to hold on to something? Link to comment Share on other sites More sharing options...
JohnBrewer Posted May 10, 2017 Share Posted May 10, 2017 Pretty impressive! Best use a ruler than a coin tho! 1 John Map of UK fossil sites Link to comment Share on other sites More sharing options...
abyssunder Posted May 10, 2017 Share Posted May 10, 2017 9 hours ago, Northern Sharks said: I don't know the GB formation well, but is Cupulocrinus present? It really looks like that, Northern Sharks. Here is for example C. crossmani for comparison: 2 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
FossilDAWG Posted May 10, 2017 Share Posted May 10, 2017 I will caution people that we would need to see something more of the plate structure in the calyx before getting too far into ID territory. Certainly you can't ID these crinoids with confidence based only on the arms. Don 4 Link to comment Share on other sites More sharing options...
Northern Sharks Posted May 11, 2017 Share Posted May 11, 2017 15 hours ago, FossilDAWG said: I will caution people that we would need to see something more of the plate structure in the calyx before getting too far into ID territory. Certainly you can't ID these crinoids with confidence based only on the arms. Don True. The calyx is the key. I see on FB that Iocrinus was also suggested as a possible ID. There's no limit to what you can accomplish when you're supposed to be doing something else Link to comment Share on other sites More sharing options...
doushantuo Posted May 11, 2017 Share Posted May 11, 2017 from zamora(PEERj,so free access)) Class CRINOIDEA Miller, 1821 Subclass DISPARIDA Moore & Laudon, 1943 Order MYELODACTYLIDA Ausich, 1998 Family IOCRINIDAE Moore & Laudon, 1943 Genus Iocrinus Hall, 1866 Type species Heterocrinus(Iocrinus) polyxo Hall, 1866= Heterocrinus subcrassus Meek & Worthen, 1865. Diagnosis :Iocrinid with basal plates visible in lateral view; anal sac with large plicate plates if calcified; variable number of primibrachials; arms branch as many as eight times; fixed interradial plates absent; column holomeric, pentalobate throughout; columnal facets in mesistele petaloid. Iocrinus africanus sp. nov. Don is right,of course. 1 Link to comment Share on other sites More sharing options...
doushantuo Posted May 11, 2017 Share Posted May 11, 2017 Rhaphanocrinus?AM looking at some synonmy lists now 1 Link to comment Share on other sites More sharing options...
abyssunder Posted May 11, 2017 Share Posted May 11, 2017 Or maybe Cupulocrinus jewetti ? " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
piranha Posted May 11, 2017 Share Posted May 11, 2017 Here is the list of Georgian Bay crinoids from Hessin 2009:Dendrocrinus dyeri Ectenocrinus simplex Glyptocrinus decadactylus Iocrinus crassus Iocrinus subcrassus Hessin, W.A. (2009) South-Central Ontario Fossils: A Guide to the Ancient Marine Life of the Region. Cobourg, Ontario, Canada, 286 pp. 2 Link to comment Share on other sites More sharing options...
crinoid1 Posted June 19, 2017 Share Posted June 19, 2017 I feel pretty confident in saying this is an Iocrinus of some kind. There are quite a few Iocrinus stems lying around the crinoid crown, and although the identifiable parts of the cup are weathered away, I see 4 primibrachs in one ray and 5 in another. Iocrinus subcrassus usually has 4-5 primibrachs, and the arms and branching pattern match. This is a fantastic and very rare specimen. I would suggest sending it to someone to prep. It might lead to not only more crinoids, but better IDs. Congrats! 1 I like crinoids...... Link to comment Share on other sites More sharing options...
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