Where is Fossil Coral found?
Fossilized Anthozoa (Coral)
Got a photo? Identify rocks instantly with the Rockby app
Open the appFossil Coral 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 Fossil Coral
Florida, USA
Known for its agatized coral, particularly the 'Florida Agatized Coral' which is the state stone. Found in Miocene-Pliocene age deposits, often in riverbeds and coastal areas.
Indonesia (Sumatra)
Produces a wide variety of fossil corals, often with vibrant colors and intricate patterns, from Cenozoic age deposits.
Morocco
Known for Paleozoic (Devonian) fossil corals, often preserved in limestone, showcasing diverse rugose and tabulate coral forms.
Utah, USA
Various locations yield fossil corals, particularly from Paleozoic marine formations.
Australia
Diverse occurrences across different states, including Western Australia and Queensland, with various ages of coral fossils.
United Kingdom
Devonian and Carboniferous fossil corals are found in areas like Devon and the Pennines.
Collecting tips
- Geological Maps. Consult geological maps to identify areas with known marine sedimentary formations, especially those from periods known for extensive coral reef development (e.g., Devonian, Carboniferous, Triassic, Jurassic, Cretaceous, Cenozoic).
- Coastal and Riverine Environments. In areas where fossil corals are known to occur, search along coastlines, riverbeds, and gravel pits where erosion may expose specimens. Florida's agatized coral is often found in these settings.
- Limestone Quarries and Road Cuts. Exposed rock faces in quarries and road cuts can reveal fossiliferous layers containing coral remains. Always obtain permission before collecting on private land or in active quarries.
- Look for Distinctive Patterns. Fossil coral is identified by its characteristic internal structures, such as the radial septa, concentric growth rings, or honeycomb-like patterns of individual polyps. These patterns are often visible on weathered surfaces or when the rock is broken.
- Hardness Test. If silicified, fossil coral will be hard (Mohs 6.5-7) and will scratch glass. This distinguishes it from un-silicified calcium carbonate coral fossils, which are softer (Mohs 3).
Quick Check
- Color:
- Variable (white, gray, brown, black, pink, red, yellow, blue)
- Luster:
- Vitreous to waxy
- Streak:
- White
Explore Fossil Coral
Identify rocks anywhere
Free on iOS, Android, and Web. Photo identification, full database, and your personal collection.