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hndmarshall

are these blastoids???

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hndmarshall

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

000_0680.JPG

000_0681.JPG

000_0682.JPG

000_0684.JPG

000_0685.JPG

000_0687.JPG

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Fossildude19

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

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Uncle Siphuncle

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.

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Plax

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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howard_l

they could be geodized that has altered the structure

 

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Zenmaster6

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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