MudstoneMullusk Posted December 10, 2022 Share Posted December 10, 2022 Hi all. I was was hoping to get help with this one from the community. It was found in-stream near an outcropping of Pittsburg Bluff in Clatsop County, Oregon, and downstream of some Astoria Formation, both marine sediments. I have found mollusks and arthropods in the same collecting area, usually in very hard concretions. To my knowledge no marine vertebrate fossils have been found within the Pittsburg Bluff Group so if it is vertebrate I'm thinking it came down from the Astoria Formation southwest of the area. It looks and feels like bone, and is extremely porous (tongue sticks). Or it may just be a pseudofossil. Either way, thank you for the help. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted December 10, 2022 Share Posted December 10, 2022 I can't make out any bone structure. Looks like weathered limestone to me and where there were cracks before the piece broke off, water seeped in and left calcite deposits seen in close up in your last photo. 2 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Rockwood Posted December 10, 2022 Share Posted December 10, 2022 Limestone if very often composed of biologically derived material (shells) so the porous nature is not unexpected. 1 Link to comment Share on other sites More sharing options...
rocket Posted December 10, 2022 Share Posted December 10, 2022 Lime- or Sandstone with weathering marks, this is what is see Link to comment Share on other sites More sharing options...
hemipristis Posted December 10, 2022 Share Posted December 10, 2022 The overall shape is suggestive, but the cross section says rock 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
MudstoneMullusk Posted December 10, 2022 Author Share Posted December 10, 2022 Thank you all for your help, it's much appreciated. Link to comment Share on other sites More sharing options...
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