Caroboneferous Posted July 18, 2021 Share Posted July 18, 2021 I've been finding fossils in limestone, sometimes I find fossils in rock that also appears to have these irregular lines interspersed. They are all shapes and sizes, I’ve attached some pictures. I am just curious as to what these are. Carbonized plant material? Or just inclusions in the rock? Link to comment Share on other sites More sharing options...
Lone Hunter Posted July 18, 2021 Share Posted July 18, 2021 Trace fossil trail would be my guess. Link to comment Share on other sites More sharing options...
connorp Posted July 18, 2021 Share Posted July 18, 2021 They look more like cross sections to me. 1 2 Link to comment Share on other sites More sharing options...
FranzBernhard Posted July 18, 2021 Share Posted July 18, 2021 Side views of the specimen would be important. Franz Bernhard 1 Link to comment Share on other sites More sharing options...
Rockwood Posted July 18, 2021 Share Posted July 18, 2021 The shapes look like cross sections, but the texture is quite trace fossil like. The two are not mutually exclusive however. I wonder if they are lined burrows. Link to comment Share on other sites More sharing options...
Caroboneferous Posted July 18, 2021 Author Share Posted July 18, 2021 7 hours ago, Rockwood said: The shapes look like cross sections, but the texture is quite trace fossil like. The two are not mutually exclusive however. I wonder if they are lined burrows. I’ve attached more pictures. This is, I think, Carboniferous limestone. This piece actually does have a small shell fossil in it (you can see the pictures). The shapes make me think of burrows. 1 Link to comment Share on other sites More sharing options...
FranzBernhard Posted July 18, 2021 Share Posted July 18, 2021 6 minutes ago, Caroboneferous said: Thanks for the extra pics! This one above gives a good impression of the overall distribution of the "dark lines". They look like some shell fragments to me, but the swirly pattern are strange! Franz Bernhard Link to comment Share on other sites More sharing options...
Caroboneferous Posted July 18, 2021 Author Share Posted July 18, 2021 10 hours ago, FranzBernhard said: Side views of the specimen would be important. Franz Bernhard I’ve attached more photos here. There is actually what looks like a fossil shell in the piece already. Link to comment Share on other sites More sharing options...
Rockwood Posted July 18, 2021 Share Posted July 18, 2021 I believe these are nearly all shells and shell fragments seen in various odd section. 1 Link to comment Share on other sites More sharing options...
Missourian Posted July 21, 2021 Share Posted July 21, 2021 These likely are thalli of calcareous phylloid algae in cross section. There are red and green varieties. In the attached image below, the one on the left is probably Archaeolithophyllum a red alga. The protuberances arrowed in red resemble conceptacles, which are often present on the surface of the blades. The other one, arrowed in green, appears to the the cross section of a cup shaped-thallus, which is more typical of green varieties of calcareous algae. 4 Context is critical. Link to comment Share on other sites More sharing options...
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