This stratum is mainly composed of mudstone.

This area is rich in pitchstone.

This area is rich in porphyrite.

The rock-wallaby is a small kangaroo native to Australia.

My hobby is to enjoy rock climbing with my friends on weekends.

Mr. Iwahori is my best friend.

The striped shore crab is a creature often seen in rocky areas.

He likes climbing rock faces.

There is a beautiful waterfall made of artificial rock in this park.

He likes to take a walk in the park at dusk.