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Originally posted by Rufflen
Can't see the video but I live in southeastern PA. Does it say a town name? I'd like to check this out.
Originally posted by EnigmaAgent
First of all thats a brilliant member name you have and thanks for posting the vid, very interesting.
Originally posted by aorAki
They could be Phonolite.
I haven't had a look at the geologic map of the area, but I reckon it's a good candidate.
Phonolite
Ah, they're Diabase. Very cool.
Ringing rocks