sedimentary

Conglomerate

Clastic Sedimentary Rock

Hardness varies from 6 to 7 due to quartz clasts; multi-colored with rounded pebbles; dull to vitreous luster; clastic texture with variable matrix.

Identified October 25, 2026More sedimentary →

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Physical properties

Hardness varies from 6 to 7 due to quartz clasts; multi-colored with rounded pebbles; dull to vitreous luster; clastic texture with variable matrix.

Formed by the consolidation of rounded gravel and pebble-sized rock fragments, typically in high-energy environments like rivers or beaches.

Used primarily as crushed stone for construction, aggregate in concrete, and occasionally as decorative facing stone.

Conglomerates can provide clues about ancient water currents and paleogeography based on the size and composition of their clasts.

Easily identified by its characteristic 'plum-pudding' appearance of large, rounded fragments cemented in a finer matrix.

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)