sedimentary
Conglomerate
Clastic Sedimentary Rock
AI-generated identification · may be incorrectHardness varies (generally 6-7 for quartz clasts); color is variable based on matrix; dull luster; composed of rounded gravel-sized rock fragments bonded by a finer matrix.
Identified More sedimentary →
Explore 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 clasts); color is variable based on matrix; dull luster; composed of rounded gravel-sized rock fragments bonded by a finer matrix.
Formation & geological history
Formed in high-energy environments like fast-flowing streams or beaches where rounded pebbles accumulate and undergo lithification.
Uses & applications
Used locally as low-grade construction aggregate and crushed stone for road bases.
Geological facts
Often referred to colloquially as 'puddingstone' when the clasts contrast sharply in color with the surrounding matrix.
Field identification & locations
Easily identified in the field by visible rounded pebbles or cobbles embedded in a finer-grained sandstone or mudstone matrix.
More like this
Other sedimentary specimens
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
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary