Answer:
As nouns the difference between mudstone and siltstone
is that mudstone is (rock) a fine-grained sedimentary rock whose original constituents were clays or muds while siltstone is a sedimentary rock whose composition is intermediate in grain size between the coarser sandstone and the finer mudstone.
How old is sandstone rock?
Sandstone: Ah, the good old days. Well, my family is known as the Old Red Sandstone. We started to form about 400 million years ago.
n June 2018, NASA reported that Curiosity had detected kerogen and other complex organic compounds from mudstone rocks approximately 3.5 billion years old.
