Where is Fossiliferous Limestone found?
Limestone with Bivalve Fossil
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Open the appFossiliferous 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
United States
Extensive deposits across the Midwest (e.g., Indiana, Illinois, Kentucky, Ohio), Texas, Florida, and the Appalachian Basin. Notable for Paleozoic and Mesozoic occurrences.
Europe
Widespread in the Jurassic and Cretaceous formations of England (e.g., Portland Stone), France, Germany, and Italy. Mediterranean regions also have significant deposits.
North Africa and Middle East
Common in Cretaceous and Tertiary marine sequences, particularly in Egypt, Jordan, and Saudi Arabia.
Australia
Found in various sedimentary basins, including the Nullarbor Plain (Miocene) and parts of Queensland.
Collecting tips
- Look for Outcrops. Examine road cuts, quarries, riverbeds, and coastal cliffs where sedimentary rock layers are exposed. Fossiliferous limestone often forms distinct, resistant beds.
- Identify Marine Environments. Focus on areas that were historically covered by shallow seas. Geological maps can indicate the presence of marine sedimentary formations.
- Acid Test. A drop of dilute hydrochloric acid (HCl) will cause calcite (and thus limestone) to effervesce (fizz) due to the release of carbon dioxide. This is a key diagnostic test.
- Examine for Fossils. Carefully inspect rock surfaces for visible shells, shell fragments, or impressions of marine organisms. Bivalve shells are often easily recognizable.
Quick Check
- Color:
- Light colors (white, gray, tan)
- Luster:
- Dull to earthy
- Streak:
- White
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