sedimentary

Fossiliferous conglomeratic sandstone

Clastic sedimentary rock, likely quartz–feldspar sandstone with lithic granules and shell/bioclastic fragments

AI-generated identification · may be incorrect

Fine-to-medium gray, poorly sorted, clastic texture with rounded tan grains or shell fragments; likely Mohs hardness 5–7, earthy to dull luster, no consistent cleavage, and moderate porosity. The visible inclusions may be carbonate fossils or weathered lithic clasts.

Identified August 25, 2026More sedimentary →

Explore Fossiliferous conglomeratic sandstone in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Fossiliferous conglomeratic sandstone
Scientific name: Clastic sedimentary rock, likely quartz–feldspar sandstone with lithic granules and shell/bioclastic fragments
Category: sedimentary
Identified: August 25, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a common hand specimen; $30–$100+ if fossils are well preserved, identifiable, and from a documented locality.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Formed when sand, gravel, and biological debris accumulated in a river, beach, or shallow-marine setting and were compacted and cemented, probably by silica or carbonate. Its precise geological age cannot be determined from the photograph.

Uses & applications

Used locally as building or landscaping stone and mainly collected for its fossil-bearing texture; uncommon attractive pieces may be used as decorative specimens.

Geological facts

The rounded inclusions suggest transport before burial, while pale porous pieces may be shell fragments rather than true mineral crystals. Acid testing can distinguish carbonate cement or fossils: dilute hydrochloric acid causes effervescence.

Field identification & locations

Common in sedimentary basins worldwide; identify it by visible grains, bedding or clast sorting, and possible fossil fragments rather than interlocking crystals. A hand lens and streak/acid tests are useful; avoid confusing shell debris with quartz pebbles.