Discussion
Sandstone is distinguished from shale chiefly by its
Answer: B
Correct answer: grain size
Sandstone is made of grains between 0.06 and 2 mm; shale of particles finer than 0.002 mm, laid down in still water and splitting along the lamination. Composition overlaps considerably - both may be quartz-rich - and both may be cemented by the same materials. It is the grain size, and the depositional energy it records, that separates them.
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