Conglomerate rocks are made up of rounded gravel-sized fragments of other rocks cemented together. These fragments can be:

* Igneous rocks: Like granite, basalt, or obsidian.

* Sedimentary rocks: Like sandstone, limestone, or shale.

* Metamorphic rocks: Like marble, slate, or gneiss.

Essentially, any type of rock can be found within a conglomerate. The specific types of rocks within a conglomerate can vary depending on the source of the gravel and the geological history of the area.