Ancient rock or mineral

vinimj

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Feb 26, 2022
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Red-Coat

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Dec 23, 2019
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Welcome to Tnet

Those look like lava flows to me... especially the structures visible in the first two pictures. They look like 'ropy lava' (known as pahoehoe). Did you find this in a known ancient volcanic area? How do you know it to be ancient... from stratigraphy where it was found?
 

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