Shale is a fine-grained sedimentary rock formed from mud.

Shale is a fine-grained rock made of ancient silt and clay.

Such cones are formed most easily in fine-grained rocks.

Hard, very fine-grained rocks can be distinguished as mudrock or siltstone in terms of their hardness relative to steel.

These are fine-grained rocks, not usually banded, nearly black in color with small red spots of garnet.

Andesite, a fine-grained rock that is widely distributed in the earth's crust.

This is provisional classification for fine-grained igneous rocks (field classification).

Slate is a fine-grained metamorphic rock that splits into thin, smooth-surfaced layers.

Thus it is very well developed on fine-grained basic igneous and metamorphic rocks.

The fine-grained rocks represent a shallow sea environment and accounts for many of the fossils.