Which sentence is correct? coarse-grained sandstone used to be quarried at will’s creek, not far from our town. coarse-grained-sandstone used to be quarried at will’s creek, not far from our town. coarse grained sandstone used to be quarried at will’s creek, not far from our town.

The correct sentence is the first option:

Coarse-grained sandstone used to be quarried at Will’s Creek, not far from our town.

coarse-grained is written with a hyphen because compound adjectives count as a single-word modifier; both words coarse and grained refer to the noun sandstone

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