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Rock that's easily eroded
Answer for the clue "Rock that's easily eroded ", 8 letters:
mudstone
Word definitions for mudstone in dictionaries
Wikipedia
Word definitions in Wikipedia
Mudstone , a type of mudrock , is a fine-grained sedimentary rock whose original constituents were clays or muds . Grain size is up to 0.0625 mm (0.0025 in) with individual grains too small to be distinguished without a microscope. With increased pressure ...
Wiktionary
Word definitions in Wiktionary
n. (context petrology English) A fine-grained sedimentary rock whose original constituents were clays or muds.
Usage examples of mudstone.
First, since the particle size of the grains in a mudstone is very small, the depositional environment in which the mudstone was formed had to have been still water, otherwise the tiny particles would have kept right on going.
And then it would turn into mudstone, and then interbedded sand and mud.
Henry knew that the mudstones had been dumped from icebergs, floating on the surface of the polar ocean that had once covered this land, an ocean four hundred million years gone.
It sweeps away any fine-grained material, including, in time, the solid rock of sandstones and mudstones, but it can’t move the bigger material, like chunks of bone.
Here and there he saw sandbars strewn with black or brown boulders mudstones and shales, said McCann, laid down in ancient swamps.
The land itself had been remolded, laid down as layer upon layer of volcanic ash, interspersed with broad beds of shale and mudstone.