However it does make me curious to know what the differences are, how different the rocks are in different locations, how different the fossils, if anybody would like to sketch that out.
Well, even two sedimentary rocks from the same time but different places can be as different as two depositional environments can be today. So you get the different marine deposits (siliceous ooze, calcareous ooze, pelagic clay) represented by chert and limestone and pelagic claystone respectively; you get deserts represented by aeolian sandstone; you get swamps represented by coal measures; lakes by lacustrine sedimentary rocks; glaciers by glacial till and outwash; you get beaches represented by their own distinctive kind of lithified deposits; and so on.
Then the fossils of course go along with the depositional environments: so we get marine fossils in limestone but terrestrial fossils in aeolian sandstone, for example.
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