sedimentary
Conglomerate (Pebble Conglomerate)
Conglomerate
Hardness varies (generally 6-7 for quartz pebbles, lower for matrix), dull to earthy luster, matrix containing rounded quartz and quartzite clasts. Varied colors including white, grey, brown, and tan.
Identified More sedimentary →
Explore Conglomerate (Pebble Conglomerate) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness varies (generally 6-7 for quartz pebbles, lower for matrix), dull to earthy luster, matrix containing rounded quartz and quartzite clasts. Varied colors including white, grey, brown, and tan.
Formation & geological history
Formed by the cementation of rounded, water-worn gravels and pebbles in high-energy aqueous environments like river beds or beaches. Commonly found in the Triassic and Carboniferous deposits of the West Midlands, UK (e.g., Kidderminster Formation / Bunter Pebble Beds).
Uses & applications
Used locally as construction aggregate, road base material, decorative garden stone, and as a geological teaching specimen.
Geological facts
The rounded pebbles inside conglomerate rocks demonstrate significant transport by ancient water currents before burial and cementation into solid rock millions of years ago.
Field identification & locations
Look for distinct rounded rock pebbles embedded in a finer sandy or silty cement matrix. Widespread across the UK, especially in former glacial and fluvial transport areas near Shropshire and Worcestershire.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale
Argillaceous sedimentary rock
sedimentary
Mudstone
Argillite / Siliciclastic sedimentary rock
sedimentary