Alpena microfossil

[Packy]

Found these star microfossils along with sponge spicules in some alpena micromaterial. Could these be small starts of evactinopora bryozoan. They are flat but round. They resemble crinoid sections from the Mississippian but there is no sign of a column. Packy 

[TqB]

I think these are probably spicules too, from a heteractinid along the lines of Astraeospongium. 

This one has blobby ones as well as the more obvious six rayed stars:

 

scale in mm

[Packy]

Awesome thanks thats what i thought but could find  any images  or documents. Is that a Devonian sponge? Where is it from?  Packy 

[piranha]

10 hours ago, TqB said:

I think these are probably spicules too, from a heteractinid along the lines of Astraeospongium.

 

Stumm 1951 reported Ensiferites sp. (Astraeospongiidae) from the Potter Farm Fm. of Alpena County.

 

Stumm, E.C. 1951
Check List of Fossil Invertebrates Described from the Middle Devonian Traverse Group of Michigan.
Contributions from the Museum of Paleontology, University of Michigan, 9(1):1-44  PDF LINK

[doushantuo]

H. & G. Termier figures astraeospongid spicules from the Devonian of the Montagne Noire ,France 

Nice find, Packy!!!

 

Edited December 4, 2024 by doushantuo

[TqB]

8 hours ago, Packy said:

Awesome thanks thats what i thought but could find  any images  or documents. Is that a Devonian sponge? Where is it from?  Packy 

That one's actually Middle Silurian, Brownsport Fmn., Tennessee.

Devonian ones are very similar - this one is Middle Devonian from Germany:

 

As @piranha said, Ensiferites is reported from Alpena. That's another Silurian and Devonian genus.
This is from the Treatise, E. armatus from the Eifelian (M. Dev.) of NY:

[doushantuo]

Packy ,this picture is from Roemer's monograph on the Silurian fossils of Tennnesee,and shows Ensiferites.

 

Tarq,stunning photography of the Astraeospongium,which looks like A.meniscum ,insofar as one can practice  a rigorous,consistent taxonomy from the macroscopic aspect

of spicule clumps.

For the record: the image immediately above is out of copyright, and thus may be freely used by all  and sundry

Edited December 4, 2024 by doushantuo

[Packy]

Thanks all. Really appreciate it. That stumm list was what I needed to id the rest of my microfinds. Packy 

[old bones]

Interesting finds!

[doushantuo]

I take it you have read this invaluable tidbit?

 

 

 

 

 

 

 

 

 

 

 

Edited December 5, 2024 by doushantuo