sedimentary

Fossiliferous Limestone

Carbonate sedimentary rock (CaCO3) with bioclasts

AI-generated identification · may be incorrect

Hardness: 3-4 (Mohs scale); Color: White, cream, or light tan; Luster: Dull to earthy; Texture: Fine-grained matrix containing visible fossil fragments; Composition: Primarily calcite.

Hardness: 3-4 (Mohs scale)
Color: White, cream, or light tan
Luster: Dull to earthy

Identified July 6, 2026More sedimentary →

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Physical properties

Hardness: 3-4 (Mohs scale); Color: White, cream, or light tan; Luster: Dull to earthy; Texture: Fine-grained matrix containing visible fossil fragments; Composition: Primarily calcite.

Formation & geological history

Formed in shallow, calm, warm marine waters from the accumulation of shell, coral, algal, and fecal debris. Over millions of years, these organic remains are lithified into solid rock.

Uses & applications

Used in construction as a building material, in the production of cement and lime, as road base, and as a collector's specimen for paleontology enthusiasts.

Geological facts

Limestone makes up about 10% of the total volume of all sedimentary rocks. It is essential for the formation of cave systems through the process of chemical weathering.

Field identification & locations

Identified by visible fossil fragments and its reaction to dilute hydrochloric acid (it will fizz). Commonly found in areas that were formerly ancient seabeds, such as the Midwestern United States or parts of Europe.