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Help with geological oddities


Lone Hunter

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Hope I'm not boring everyone as I'm going through my pile,  my curiosity has no limits. Found all these at various North Texas creeks,  probably all concretions just wondering if there's a name to put with them.  One looks like my dogs poop, wondering if it's coprolite.  Appreciate any feedback!

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First four photos are ironstone concretion with high iron content (iron oxide) filling of cracks that developed in the original concretion. Ironstone concretions are common at certain levels in the Woodbine, and there are usually a lot of them scattered on the upper surface of eroding Woodbine-Grayson contact exposures.  I even have some in my collection. 

 

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I have gathered several of those at lake Grapevine,  just never one with those lines in the 'bubbles', wasn't sure if there was a worm or something else involved.  Thanks for the help!

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