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21-04-2020, 00:42   #1
Deagol
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Rock inside a rock - how does it happen?

Hi all, i'm a fairly well read and well educated man but this one has me beaten - found this out in the back yard and I can't figure out how it came to be. It looks like some kind of 'regular' rock wrapped inside a an iron containing rock.

Any geology experts can help me?
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24-04-2020, 04:35   #2
bogwalrus
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Quote:
Originally Posted by Deagol View Post
Hi all, i'm a fairly well read and well educated man but this one has me beaten - found this out in the back yard and I can't figure out how it came to be. It looks like some kind of 'regular' rock wrapped inside a an iron containing rock.

Any geology experts can help me?
My 2 cents. Under heat the minerals rose to the outside and formed a crust. So it just appears to be a rock inside a rock.

Or could have actually been a rock that got covered in sediment of a different type and over time worn pressure formed a rock on outside.

There are probably a number of processes that can do this.
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