Ordovician Sponge

Since, this is an educational forum, it appears that jstor allows distribution with the caveat that the material not be used for financial gain.

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If the admins interpret the clause as I do(IANAL), all papers are fair game as long as they are for education or research, and in the future, we can supply the information for all curious minded individuals
 
Solius, I don't have a clue how all that works but I suppose Tonmo would have to be "listed" as one of the institutions with access....(IANAL) either :goofysca:
 
i think what you have is some kind of stromatoporoid. ive collected a lot stroms in Michigan and the thing in you pic looks like the Silurian period ones i find.
 
i admit that i dont know much about Ordovician fossil fauna, so your opinion is probably worth more than mine. however, last time i checked demosponges were very rare throughout the Paleozoic, but silica sponges and stromatoporoids were more common at the time.

in Silurian and Devonian Michigan formations the ratio of stromatoporoid species to silica sponges varies from 6:1 to 16:2 (with no demosponges described). assuming that statistic applies to the Ordovician, odds are that your fossil is a strom or silica sponge.
 
Proteus, I do not claim to know, with any amount of certainty, what this fossil is. As we all know with a specimen this old, damaged and a shabby photo, attempting on-line identification is dicey to say the least. BUT with the evidence I presented, I believe that Archaeoscyphia is a good place to begin with study (which would be much easier if I could find the specimen) :heee:. And there is also this: http://paleodb.org/cgi-bin/bridge.pl?a=checkTaxonInfo&taxon_no=3007&is_real_user=1 (click on age range and collections tab at top of page).
 

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