Lauren16 Posted March 7, 2020 Share Posted March 7, 2020 This is the 3rd post of features from a limetone/dolostone rock, found loose in a river, presumably carried south from the limestone bedrock further north. If this is just chert concretion, not a fossil, then Q How did the parallel grooves form? The grooves in this feature had been emclosed in soft chalky dolostone material until I removed it with vinegar baths and much rubbing, so were not caused by weathering and are not glacial striae. And last, this is one of several bonelike features in this rock, that I understand are just chert, but the structure of the end looks bone-like to me. It was seeing these bone-like features sticking out of a normal limestone rock that caused me to soak the rock in several vinegar baths and keeping rubbing and brushing, which exposed all the small features with parallel grooves in this 3-post post. Link to comment Share on other sites More sharing options...
fifbrindacier Posted March 7, 2020 Share Posted March 7, 2020 With all the bath of vinegar you put that piece in, all shell have melted. If there is a fossil there it then must be an internal cast. I think this is limestone with probably infilled burrows. 1 "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
Lauren16 Posted March 7, 2020 Author Share Posted March 7, 2020 Thank you for sharing your insights! Lauren Link to comment Share on other sites More sharing options...
Shamalama Posted March 9, 2020 Share Posted March 9, 2020 On 3/7/2020 at 4:33 PM, fifbrindacier said: With all the bath of vinegar you put that piece in, all shell have melted. If there is a fossil there it then must be an internal cast. I think this is limestone with probably infilled burrows. Agreed, might just be an infilled burrow or odd mineralization feature. 1 -Dave __________________________________________________ Geologists on the whole are inconsistent drivers. When a roadcut presents itself, they tend to lurch and weave. To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrain. - John McPheeIf I'm going to drive safely, I can't do geology. - John McPheeCheck out my Blog for more fossils I've found: http://viewsofthemahantango.blogspot.com/ Link to comment Share on other sites More sharing options...
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