sedimentary

Sandstone Fossil Slab

Quartz arenite with trace fossils

Hardness of 6-7 on Mohs scale, tan to gray color, dull luster, clastic texture, specific gravity around 2.3-2.6.

Identified November 15, 2026More sedimentary →

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Physical properties

Hardness of 6-7 on Mohs scale, tan to gray color, dull luster, clastic texture, specific gravity around 2.3-2.6.

Formed by the compaction and cementation of sand-grained minerals, often in ancient marine or desert environments over millions of years.

Used primarily in construction, architectural paving, and as educational geological specimens for fossil collectors.

Sandstone layers frequently preserve trace fossils like burrows and ripple marks, offering windows into ancient ecosystems.

Identify in the field by visible sand grains and fossil impressions; commonly found in sedimentary basins worldwide.

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

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Shale

Fissile Sedimentary Rock

Sandstone

Arenite

Shale

Clastic sedimentary rock