* Clastic: Clastic rocks are formed from fragments of other rocks. Conglomerates are made up of rounded gravel-sized fragments (clasts).

* Sedimentary: Sedimentary rocks are formed by the accumulation and cementation of sediments.

* Organic: Organic rocks are formed from the remains of living organisms (like coal).

* Chemical: Chemical rocks are formed by the precipitation of minerals from solutions (like limestone).

Since conglomerates are formed from fragments of other rocks, they are clastic sedimentary rocks.