Woodgrainstone Posted January 8, 2017 Share Posted January 8, 2017 I am studying the stratigraphy of the Permian Word Formation in the Glass Mountains of West Texas. Though there are obvious ammonite, brachiopod, and fusulinid fossils in the strata, I keep coming across these geometric patterns. Could someone help me identify the origin of these patterns? Are they fossils or some bizarre diagenetic process? There has been ample alteration of these limestones by silica(chert). vertical slice Horizon of sponges? above 'sand stringers' or silicification bands Plan view Link to comment Share on other sites More sharing options...
Woodgrainstone Posted January 8, 2017 Author Share Posted January 8, 2017 Link to comment Share on other sites More sharing options...
Woodgrainstone Posted January 8, 2017 Author Share Posted January 8, 2017 Looking through a binocular scope at the hand specimen. The skin is replaced by chert. Scale bar in millimeters Link to comment Share on other sites More sharing options...
Woodgrainstone Posted January 8, 2017 Author Share Posted January 8, 2017 Possible modern analog?? Barrel Sponge Link to comment Share on other sites More sharing options...
abyssunder Posted January 9, 2017 Share Posted January 9, 2017 I think, there could be crystallized mineral infills in septarian propagation cracks. 1 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Woodgrainstone Posted January 9, 2017 Author Share Posted January 9, 2017 Thank you, I see it now. Not as exciting as I thought ha ha ha Link to comment Share on other sites More sharing options...
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