sedimentary

Conglomerate

Clastic Sedimentary Rock

Hardness varies (3-7 depending on clasts), multicolored or earthy, dull to vitreous luster, clastic texture with rounded fragments, no cleavage.

Identified October 17, 2026More sedimentary →

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Physical properties

Hardness varies (3-7 depending on clasts), multicolored or earthy, dull to vitreous luster, clastic texture with rounded fragments, no cleavage.

Formed from the consolidation and cementation of gravel-sized rounded clasts, deposited by high-energy water environments like rivers or beaches.

Used primarily as aggregate in construction, road building, and occasionally as decorative facing stone.

Conglomerates are often referred to as 'puddingstone' when the rounded pebbles contrast sharply with a finer-grained matrix.

Easily identified in the field by its distinct visible rounded pebbles or gravel embedded in a finer matrix, found globally in ancient riverbeds.

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)