Containing a variety of different materials, polygenetic conglomerates can have fragments derived from igneous, metamorphic, and sedimentary rocks, as well as particles of individual minerals. The fragments can be cemented by various minerals, including quartz, iron oxides, and calcite.

TEXTURE The grains in a polygenetic conglomerate are rounded or subrounded by the action of water. There may be some smaller angular fragments in the matrix between the large grains.

ORIGIN Forms in high-energy environments, such as powerful water currents, which are able to move the large fragments of rock.

Grain size: Very coarse

Classification: Detrital

Fossils: Very rare

Grain shape: Rounded