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are these blastoids???


hndmarshall

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first item first three photos second item next three

I can see they are not the same type but what are they?

found in gravel load

west of Houston Texas

from Brazos River

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Sorry, but I'm not seeing any symmetry with these pieces.  :unsure: 

    Tim    VETERAN SHALE SPLITTER

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"In every walk with nature one receives far more than he seeks."
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As Tim said, blastoids will exhibit pentameral symmetry which is not expressed in these finds, but I see enough gross similarities to see that you are searching with a discriminating eye.  FYI, blastoids are exceedingly rare in TX and would be most likely in Carboniferous strata 300+/- miles to your northwest.

Grüße,

Daniel A. Wöhr aus Südtexas

"To the motivated go the spoils."

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might possibly be a well worn "chertified" rudist. Your local folks will be able to say it that is a possibility. I'm just guessing.

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Looks like a Fossilized Rudist or type of singular coral. While Rudists usually have flat tops this has a rounded more Blastoid appearance. If you only showed me the shadow, I would think it was a Blastoid but the lack of symmetry that FossilDude19 pointed out, makes it unlikely. I would think some kind of coral. Try putting vinegar on it and seeing if it fizzes. If so, then its definitely calcium carbonate, the main composition of corals and shell bearing life.

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