Let's start with deep-water marine sediments and follow the process Add heat and pressure between (and within) each step Metamorphics are the ultimate &quot;shades of gray&quot; situation in geology These are only the broadest of category names The variations are endless Shale A common sedimentary rock Very fine grain Toss in a little sandstone and limestone and you've got your basic marine sedimentary assemblage Slate Little or no significant visible change (Monroe;
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