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Where is Fossiliferous Limestone found?

Limestone with marine fossils (e.g., brachiopods, bivalves)

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Fossiliferous Limestone occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.

Where to find Fossiliferous Limestone

North America

Extensive deposits are found in the Appalachian Basin (e.g., Silurian and Devonian limestones), the Midcontinent region (e.g., Mississippian and Pennsylvanian limestones), and the Western Interior Seaway deposits (Cretaceous). Notable examples include the Burlington Limestone (Mississippian) and the Salem Limestone (Mississippian) in the US.

Europe

Common in the Jurassic and Cretaceous strata of the Paris Basin, the Jurassic limestones of the Swabian Alb (Germany), and the Carboniferous Limestone of the UK and Ireland.

Asia

Significant occurrences in the Tethyan realm, including the Himalayas and Southeast Asia, with various ages represented.

Australia

Found in various Paleozoic and Mesozoic basins, particularly in Western Australia and Queensland.

Collecting tips

  1. Look for Marine Sedimentary Sequences. Fossiliferous limestones are almost exclusively found in sedimentary rock sequences that indicate ancient marine environments. Look for outcrops in areas known for marine sedimentary rocks.
  2. Examine Outcrop Surfaces Closely. The fossils may be weathered out on the surface, making them more prominent. Look for distinct shapes and patterns that suggest skeletal remains.
  3. Perform an Acid Test (with caution). A drop of dilute hydrochloric acid (HCl) will cause calcite to effervesce (fizz), indicating the presence of calcium carbonate. This is a key diagnostic test for limestone. Always wear appropriate safety gear (gloves, eye protection) when handling acids.
  4. Check for Bioclastic Texture. Observe the rock's texture. If it's composed of visible shell fragments, crinoid stems, or other skeletal debris, it's likely a fossiliferous limestone.

Quick Check

Color:
White, gray, tan, or dark gray
Luster:
Dull to earthy
Streak:
White

Explore Fossiliferous Limestone

Overview

Full guide to Fossiliferous Limestone

Identification

Look-alikes

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