sedimentary

Conglomerate

Clastic Sedimentary Rock

Hardness varies from 6 to 7 depending on clast composition, multicolored with rounded pebbles, dull to vitreous luster, clastic texture.

Identified October 25, 2026More sedimentary →

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Physical properties

Hardness varies from 6 to 7 depending on clast composition, multicolored with rounded pebbles, dull to vitreous luster, clastic texture.

Formed by the consolidation of rounded gravel and boulder-sized clasts in high-energy environments like rivers or beaches.

Used mainly as crushed stone for construction, road aggregate, and decorative landscaping.

Conglomerates are often called natural concrete due to their structure. They provide direct evidence of ancient water flow energy.

Easily identified by distinct rounded rock fragments embedded in a finer matrix, commonly found in alluvial fans and 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)