Where is Ammonite Fossil found?
Ammonoidea (fossil)
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Open the appAmmonite Fossil 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 Ammonite Fossil
Western Interior Seaway (North America)
Extensive deposits in states like Montana, Wyoming, South Dakota, and Alberta (Canada), particularly known for large and iridescent ammonites (ammolite).
Jurassic Coast (England)
A UNESCO World Heritage Site famous for abundant and well-preserved ammonites from the Jurassic and Cretaceous periods.
Madagascar
Known for beautifully preserved, often iridescent or polished ammonites, particularly from the Cretaceous period.
Germany
Various localities, including Holzmaden, are famous for exceptionally preserved Jurassic ammonites, often with soft tissue impressions.
Russia (Volga Region)
Significant finds of Jurassic and Cretaceous ammonites.
Collecting tips
- Target Sedimentary Rocks. Focus on marine sedimentary rock formations, especially shales, limestones, and marls, which are conducive to fossil preservation. Look for outcrops, road cuts, and coastal cliffs.
- Look for Distinctive Shapes. Search for the characteristic coiled or spiral shapes. Even fragments can be identifiable by their curvature or suture patterns.
- Check for Associated Fossils. Ammonites often occur with other marine fossils like belemnites, bivalves, and brachiopods, indicating a fossiliferous layer.
- Tools and Safety. Bring a geological hammer, chisels, safety glasses, and a sturdy bag. Always prioritize safety, especially near cliffs or unstable rock formations. Obtain permission before collecting on private land.
- Preparation and Preservation. Once found, carefully clean and prepare the fossil. Some fragile specimens may require stabilization with consolidants. Avoid harsh chemicals that could damage the fossil.
Quick Check
- Color:
- Variable (brown, grey, black, white, iridescent)
- Luster:
- Variable (dull, vitreous, pearly, metallic)
- Streak:
- Not applicable for the fossil itself; streak would be of the infilling mineral (e.g., white for calcite, black for pyrite).
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