That's right! Sedimentary rocks made up of large pebbles and stones are considered coarse-grained.

Here's why:

* Grain Size: The term "grain" in geology refers to the individual particles that make up a rock.

* Coarse-Grained: This means the grains are large and easily visible to the naked eye. Examples include pebbles, gravel, and even boulders.

Examples of coarse-grained sedimentary rocks:

* Conglomerate: Made up of rounded pebbles and stones cemented together.

* Breccia: Similar to conglomerate, but the pebbles and stones are angular and have sharp edges.

Let me know if you have any other questions about rocks!