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Weird rock to identify

+1 vote

These are two rocks I took to a geology professor he identified the first as mud stone and said it was 2 billion years old. The second one he said was formed by one mineral washing away and a harder one remaining. He then explained the puddingstone was alluvial run off and the two billion year old rock and the puddingstone had probably been dropped by glacial activity.

asked Nov 13, 2015 by Weasel (58,930 points)

1 Answer

0 votes
The top one looks like some sort of banded jasper or banded chert. Definitely do a hardness test and see if it matches up close to 7. The middle one is too difficult to see the texture, and the bottom one a conglomerate.
answered Nov 24, 2015 by hershel (52,780 points)