Where is Fossilized Coral found?
Rugose Coral (horn coral) or Tabulate Coral
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Open the appFossilized 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 Fossilized Coral
Florida, USA
Known for its agatized coral, particularly the 'Florida Agatized Coral' which is the state stone. Found in Miocene-Pliocene age deposits.
Indonesia (Sumatra)
Produces large quantities of beautifully agatized fossil coral, often with vibrant colors and intricate patterns, from various Cenozoic marine deposits.
Morocco
Abundant in Paleozoic (Devonian) rugose and tabulate corals, often preserved in limestone or as silicified specimens.
United Kingdom (e.g., Devon, Yorkshire)
Rich in Paleozoic (Devonian, Carboniferous) rugose and tabulate corals, often found in limestone formations.
USA (various states including Michigan, Indiana, Kentucky, New York)
Numerous Paleozoic marine deposits yield rugose and tabulate corals, often preserved in limestone or shale. Michigan is known for its 'Petoskey Stone' (Hexagonaria percarinata, a colonial rugose coral).
Australia
Various locations yield fossil corals from different geological periods, including Paleozoic and Mesozoic marine sediments.
Collecting tips
- Target Sedimentary Rocks. Focus your search on marine sedimentary rock outcrops, especially limestones, shales, and sandstones that are known to be fossiliferous. Ancient reef complexes are prime locations.
- Look for Distinctive Patterns. Even if the external shape is not obvious, look for the characteristic internal structures of coral, such as radiating septa (rugose) or honeycomb/chain-like patterns (tabulate) on weathered surfaces or broken fragments.
- Check Riverbeds and Gravel Pits. Erosion can expose and transport fossilized coral. Riverbeds, gravel pits, and glacial till deposits can be good places to find weathered specimens.
- Consult Geological Maps and Local Experts. Geological maps can pinpoint formations known to contain marine fossils. Local rockhounding clubs or geological societies can provide valuable information on specific collecting sites.
- Safety Precautions. Always obtain permission before collecting on private land. Be aware of your surroundings, especially near cliffs or unstable rock formations. Wear appropriate safety gear, including sturdy footwear and eye protection if breaking rocks. While fossilized coral itself is not hazardous, the surrounding rock matrix might contain silica dust if cut or ground, so proper ventilation and respiratory protection are advised during processing.
Quick Check
- Color:
- Variable (grays, browns, whites, reds, yellows, blacks), often patterned.
- Luster:
- Vitreous to waxy (if agatized), dull (if unpolished or calcitic).
- Streak:
- White (if silicified or calcitic).
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