sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
AI-generated identification · may be incorrectHardness: 3 (Mohs scale); Color: Tan, beige, or gray; Luster: Dull/earthy; Structure: Clastic or organic; Cleavage: None; Specific Gravity: 2.3–2.7
- Hardness
- 3 (Mohs scale)
- Color
- Tan, beige, or gray
- Luster
- Dull/earthy
Identified More sedimentary →
Explore Fossiliferous Limestone in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3 (Mohs scale); Color: Tan, beige, or gray; Luster: Dull/earthy; Structure: Clastic or organic; Cleavage: None; Specific Gravity: 2.3–2.7
Formation & geological history
Formed in marine environments from the accumulation of calcium carbonate and organic remains (shells and coral). This specimen likely dates from the Paleozoic or Mesozoic era.
Uses & applications
Used in construction, cement production, architectural stone, and as a soil conditioner in agriculture.
Geological facts
This rock acts as a natural record of prehistoric oceans. It contains 'trace fossils' or mold/cast impressions of ancient marine life like brachiopods or crinoids.
Field identification & locations
Identify in the field by looking for visible shell fragments or pits where fossils once were; it will also bubble (effervesce) if it comes into contact with dilute hydrochloric acid.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary