Where is Fossilized Coral (Rugose or Tabulate Coral) found?
Rugose or Tabulate Coral (fossil)
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Open the appFossilized Coral (Rugose or Tabulate 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 (Rugose or Tabulate Coral)
Florida, USA
Known for its agatized coral, particularly the 'Florida Agatized Coral' which is the state stone. Found in Miocene-Pliocene deposits.
Indonesia (Sumatra)
Produces large quantities of beautifully patterned fossilized coral, often with vibrant colors.
Morocco
Known for Devonian-age rugose and tabulate corals, often preserved in limestone.
United Kingdom (e.g., Wenlock Edge, Shropshire)
Silurian-age tabulate and rugose corals are abundant in limestone formations.
Australia (e.g., Queensland)
Various localities yield fossilized corals from different geological periods.
USA (various states)
Found in numerous states with ancient marine sedimentary rocks, including Michigan (Petoskey Stone - a colonial rugose coral, Hexagonaria percarinata), Indiana, Kentucky, and New York.
Collecting tips
- Research Local Geology. Identify areas known for marine sedimentary rocks from the Ordovician to Permian periods. Geological maps and local fossil clubs are excellent resources.
- Look in Riverbeds and Gravel Pits. Erosion can expose fossilized coral in riverbeds, stream banks, and gravel pits, especially in regions with underlying marine sedimentary bedrock.
- Examine Limestone Outcrops. Many fossil corals are preserved within limestone. Look for weathered surfaces where the coral structure might be more visible.
- Check for Distinctive Patterns. Look for the characteristic radial septa (rugose) or honeycomb/chain-like patterns (tabulate) on weathered rock surfaces. Polished specimens will show these patterns more clearly.
- Acid Test (Caution). A small drop of dilute hydrochloric acid (HCl) will not react with silicified coral, distinguishing it from un-silicified calcium carbonate coral which will effervesce. Use extreme caution with acids and wear appropriate safety gear.
Quick Check
- Color:
- Variable (white, gray, brown, black, pink, red, yellow, blue), often patterned.
- Luster:
- Vitreous to waxy.
- Streak:
- White (characteristic of chalcedony/quartz).
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