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Updated March 2026
795+ Fossil Entries
Idaho Ammonite fossil specimen
cephalopodMesozoicUpdated March 2026

Idaho Ammonite

Mesozoic

About Idaho Ammonite

The Idaho Ammonite is a cephalopod fossil dating to the Mesozoic. Ammonite is a realistic Idaho fossil profile built around coiled marine shell with complex sutures from warm Cretaceous seas. In this state, success usually comes from learning dinosaur-bearing mudstones, glacial gravels, and marine shales, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.

“According to TroveRadar, Idaho Ammonite fossils from the Mesozoic are found across Idaho. TroveRadar's field database catalogs 795+ fossil entries for identification and collection guidance.

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Identification Tips

  • planispiral coil
  • suture patterns
  • chambered shell
  • Check dinosaur-bearing mudstones, glacial gravels, and marine shales

Where Found

Idaho

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Related Fossils

North Dakota Ammonite

North Dakota Ammonite

Mesozoic

Ammonite is a realistic North Dakota fossil profile built around coiled marine shell with complex sutures from warm Cretaceous seas. In this state, success usually comes from learning chalk beds, badlands mudstones, and river gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.

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South Dakota Ammonite

South Dakota Ammonite

Mesozoic

Ammonite is a realistic South Dakota fossil profile built around coiled marine shell with complex sutures from warm Cretaceous seas. In this state, success usually comes from learning chalk beds, badlands mudstones, and river gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.

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Nebraska Ammonite

Nebraska Ammonite

Mesozoic

Ammonite is a realistic Nebraska fossil profile built around coiled marine shell with complex sutures from warm Cretaceous seas. In this state, success usually comes from learning chalk beds, badlands mudstones, and river gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.

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Kansas Ammonite

Kansas Ammonite

Mesozoic

Ammonite is a realistic Kansas fossil profile built around coiled marine shell with complex sutures from warm Cretaceous seas. In this state, success usually comes from learning chalk beds, badlands mudstones, and river gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.

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Oklahoma Ammonite

Oklahoma Ammonite

Mesozoic

Ammonite is a realistic Oklahoma fossil profile built around coiled marine shell with complex sutures from warm Cretaceous seas. In this state, success usually comes from learning chalk beds, badlands mudstones, and river gravels, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.

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Montana Ammonite

Montana Ammonite

Mesozoic

Ammonite is a realistic Montana fossil profile built around coiled marine shell with complex sutures from warm Cretaceous seas. In this state, success usually comes from learning dinosaur-bearing mudstones, glacial gravels, and marine shales, then timing runoff, reservoir drawdown, surf cuts, or road work that exposes fresh fossil-bearing rock instead of hunting blindly.

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Explore More

How do I identify a Idaho Ammonite fossil?
Idaho Ammonite fossils from the Mesozoic can be identified by: planispiral coil. suture patterns. chambered shell. Check dinosaur-bearing mudstones, glacial gravels, and marine shales. They are most commonly found in Idaho.
Where are Idaho Ammonite fossils found?
Idaho Ammonite fossils are found in Idaho. Look in sedimentary rock formations dating to the Mesozoic era. The best collecting is typically found in exposed roadcuts, creek banks, and quarry sites.
How old are Idaho Ammonite fossils?
Idaho Ammonite fossils date to the Mesozoic. They are classified as cephalopod fossils in TroveRadar's database, which catalogs 795+ fossil entries across North America.
Is it legal to collect Idaho Ammonite fossils?
Fossil collecting laws vary by state and land ownership. Common invertebrate fossils are generally collectible on some public lands for personal use, but vertebrate fossils and collecting on protected lands may require permits. Always check local regulations before collecting. Use TroveRadar's State Guides for specific rules.