Erosion of rocks and boulders

Top Cat
Reply 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?
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Type: Question • Score: 4 • Views: 1,419 • Replies: 2
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Reply Thu 12 Apr, 2018 01:04 pm
@Top Cat,
Pillow Lava maybe? Can you send a link to the photo's?
Reply Fri 13 Apr, 2018 04:27 am
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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