Where is Fossilized Coral found?
Fossilized Coral (Calcium Carbonate)
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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 'Agatized Coral' (Florida's state stone), particularly from the Tampa Bay area and other Miocene-Pliocene deposits. These are often beautifully silicified.
Indonesia
Produces a wide variety of fossilized corals, often with excellent preservation and diverse colors, from various Cenozoic marine deposits.
Morocco
Known for Devonian and Carboniferous fossil corals, often found in limestone formations.
Australia
Various locations yield fossil corals from different geological periods, including the Permian and Mesozoic.
United Kingdom
Carboniferous limestone formations in areas like Derbyshire and Yorkshire contain fossil corals.
Canada
Devonian and Silurian fossil corals are found in various provinces, particularly in Ontario and Alberta.
Collecting tips
- Research Local Geology. Identify areas known for ancient marine sedimentary rocks, especially limestone or shale formations, which are prime locations for fossil corals. Geological maps and local fossil clubs can be excellent resources.
- Look for Outcrops and Road Cuts. Exposed rock faces, riverbeds, and construction sites can reveal fossil-bearing layers. Always obtain permission before collecting on private land.
- Examine Rock Surfaces Carefully. Look for distinctive patterns that resemble honeycomb, radiating lines, or other colonial structures. The texture might be different from the surrounding matrix.
- Check for Hardness. If silicified, it will be harder than steel (Mohs 7). If calcified, it will be softer (Mohs 3). This can help differentiate it from surrounding rock.
- Acid Test (Caution Recommended). A small drop of dilute hydrochloric acid will effervesce on calcified coral (calcite), but not on silicified coral (chalcedony). Use this test sparingly and with caution, as it can damage the specimen.
Quick Check
- Color:
- Variable (white, gray, brown, black, pink, red, yellow), often patterned.
- Luster:
- Vitreous to waxy.
- Streak:
- White (for both calcified and silicified varieties).
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