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Thu 12 Apr, 2018 11:23 am
I have a photo of Surtsey Island showing a large pile of very smooth large stones. Since this island is quite young, how could these rocks and stones have got so smooth and rounded?
@Top Cat,
Pillow Lava maybe? Can you send a link to the photo's?
@rosborne979,
Yeh, volcanic concretions or pillow basalts are good candidates. If its from the recent ruptions itd be just a few decades old.
Heres a picture of septerian (Moeraki) concretions from New Zealand.These are about 60 my old
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