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Tales From the Shale

Some of the blastoids I picked up while in Michigan awhile back. I'm not sure of their identities, however I imagine it wouldn't be hard with some effort.

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connorp

Nice. Are these from the Alpena area?

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Tales From the Shale

Yes, all from Alpena, in two different sites.

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  • 2 weeks later...
FossilNerd

Nice! I am rather fond of blastoids, as you can tell from my Avatar picture. ;) 

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The two big one are Placoblastus obovatus.

The other three are Heteroschisma subtrunctatum

The single one is a Hyperoblastus sp.  I can't tell the species from the pics.

Joe

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Tales From the Shale
2 hours ago, crinus said:

The two big one are Placoblastus obovatus.

The other three are Heteroschisma subtrunctatum

The single one is a Hyperoblastus sp.  I can't tell the species from the pics.

Joe

Thank you, I figured out the smaller ones might have been Heteroschisma, but was lost on some of the larger ones, as they don't look like any others I've found.

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FYI. There is current work in progress that will make Placoblastus obsolete.  It will become Nucleocrinus. Sometimes I have difficulty with both both genera from Alpena.  Both are found there and sometime small Placoblastus look like Nucleocrinus.  Yours are a bit weather worn so I assigned them to Placoblastus simply because of the size.

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You mentioned that you found them at two different sites.  Is one of the Heteroschisma from the other site. It looks a bit different and may be a different species.  Obviously most of the material is from PP.  What is the other site?

Joe

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