Fossiliferous Limestone

Physical Properties

Hardness: 3 on Mohs scale; Color: Gray to tan; Luster: Dull or earthy; Structure: Clastic or Biogenic; Specific Gravity: 2.5-2.7. It contains visible shell fragments and marine fossils.

Formation & Geological History

Formed in warm, shallow marine environments through the accumulation of calcium carbonate and organic remains (shells and skeletons of marine organisms) over millions of years.

Uses & Applications

Used in the production of cement, as a building stone, in road construction, and highly valued by fossil collectors for educational purposes.

Geological Facts

This specimen likely contains fragments of brachiopods or crinoids. Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth.

Field Identification & Locations

Identified by the presence of visible fossils and its reaction to dilute hydrochloric acid (it will fizz). Commonly found in areas that were once prehistoric seafloors.

Identified on: 5/2/2026

Mode: Standard