"SILT" IS NOT SOMETHING DIFFERENT FROM "MUD." SILT IS A TYPE OF MUD.
"MUD" refers to all clastic grains smaller than 0.06 mm. "SILT" IS MUD with a grain size between 0.06 mm and 0.004 mm. If you are referring to MUD that is finer than SILT (i.e. is not gritty when you chew it), you are talking about "CLAY."
The two types of MUDSTONE are SILTSTONE and CLAYSTONE.
Got it?
JESUS.
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this reads like the first chapter of a book entitled, "The Exasperated Geologist," which i think you should consider writing if you ever find a spare week.
Speaking as a so-called palaeontologist who knows almost literally nothing about geology (phew! I'm glad that didn't come up in my viva!) I found this the most informative and memorable bit of geology teaching I've ever read.
Seriously.
So if you ever write The Exasperated Geologist, put me down for a copy.
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