sedimentary

Weathered fossiliferous limestone pebble

Calcite-rich limestone (primarily CaCO₃); exact fossil content is unclear from the image

AI-generated identification · may be incorrect

Tan to gray-brown, rounded, dull and rough, with pale fossil-like fragments or calcite patches. Calcite is Mohs 3, trigonal, and fizzes in dilute acid; hardness and texture vary with impurities and cementation.

Identified October 10, 2026More sedimentary →

Explore Weathered fossiliferous limestone pebble in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Likely formed from carbonate shells and sediment deposited in a marine setting, then lithified and rounded by transport. The image cannot determine its geological age.

Uses & applications

Limestone is used for cement, aggregate, building stone, and agricultural lime; this small pebble is mainly a collecting specimen.

Geological facts

Limestone can preserve abundant marine fossils, though the visible markings here are not sufficient to identify a particular fossil.

Field identification & locations

Look for carbonate-rich texture and shell fragments; a drop of dilute acid may fizz, especially on a freshly exposed surface. Limestone occurs widely in ancient marine sedimentary basins worldwide.