# Ammonite Fossil

An ammonite fossil looks like a spiral shell and comes from a creature that swam in the sea. They are now extinct but were once very common!

- **Category:** [Ancient](https://www.snappit.app/explore/categories/ancient)
- **Rarity:** Common
- **Danger:** 1/5 · Very low
- **Also known as:** Ammonite Shell

![Ammonite Fossil](https://res.cloudinary.com/drieglelr/image/upload/v1771424360/objects/5816.jpg)

## Appearance

The Ammonite Fossil is a prehistoric marine mollusk, typically appearing as a coiled, spiral shell. Often found in shades of grey, brown, or black, its surface can be smooth or intricately ribbed. Its distinct chambered internal structure sets it apart from modern snail or clam shells.

## Taxonomy

- **Kingdom:** Animalia

## Interesting facts

- Ancient people thought ammonite fossils were petrified snakes, called 'snakestones'!
- Some ammonites were tiny as a coin; others grew larger than a car tire!
- Their closest living relatives are squids and octopuses, not snails!
- When cut in half, ammonite shells show beautiful, intricate chamber patterns!

## Special abilities

- **Oceanic Navigator:** Ammonite Fossil can float and sink through ancient seas by using gas-filled chambers that adjust buoyancy.
- **Growth Recorder:** Ammonite Fossil has growth lines on its shell that record its life history and environmental changes.
- **Time Capsule Shell:** Ammonite Fossil has a strong, mineralized shell that protects soft body parts for millions of years.

## Measurements & details

- **Length:** 0.01-1.8 m
- **Weight:** 0.001-150 kg
- **Era:** Mesozoic (Triassic to Cretaceous)
- **Extinct Millions Years Ago:** 66

## Diet & Feeding

Ammonites were ancient ocean predators, munching on tiny fish, crustaceans, and plankton.

- **Primary Foods:** Small fish, Crustaceans, Plankton, Other cephalopods
- **Foraging Method:** Pursuit

## Ecological connections

- **Eaten by:** Mosasaur (*Mosasaurus hoffmannii*) — A fierce marine reptile that commonly preyed on ammonites.
- **Eaten by:** Ichthyosaur (*Ichthyosaurus communis*) — Fast-swimming marine reptiles that hunted cephalopods like ammonites.
- **Eats:** Leptolepis fish (*Leptolepis coryphaenoides*) — Ammonites likely fed on small, schooling fish like Leptolepis.

## Traits

- [Ancient](https://www.snappit.app/explore/traits/ancient): Ancient refers to organisms, objects, or geological formations that have existed for an extremely long period.
- [Artifact](https://www.snappit.app/explore/traits/artifact): An artifact is an object made or modified by human culture, typically of historical or archaeological interest.
- [Fossil](https://www.snappit.app/explore/traits/fossil): A fossil is the preserved remains or traces of an ancient organism embedded in rock or other geological deposits.

## Collections

- [Ancient](https://www.snappit.app/explore/collections/ancient)

## Safety

**Danger:** 1/5 · Very low

Explore with care and ask an adult if you're unsure what to do.

## Frequently Asked Questions

### How to identify Ammonite Fossil?

Compare skull shape, horns, plates, limbs, posture and tail. Museum models and toys can mix features or follow outdated reconstructions. Dinosaur Identifier: upload a photo and compare the visible details.

### How long is Ammonite Fossil?

0.01-1.8 m

### How much does Ammonite Fossil weigh?

0.001-150 kg

### What does Ammonite Fossil eat?

Ammonites were ancient ocean predators, munching on tiny fish, crustaceans, and plankton.

### How does Ammonite Fossil hunt?

Pursuit

### What geologic era did Ammonite Fossil live in?

Mesozoic (Triassic to Cretaceous)

### When did Ammonite Fossil go extinct?

66

## Where to spot

- [California Academy of Sciences](https://www.snappit.app/guides/places/california-academy-of-sciences-california) — California, US · Zoo

## More Ancient

- [Tyrannosaurus rex](https://www.snappit.app/explore/tyrannosaurus-rex) (*Tyrannosaurus rex*)
- [Triceratops](https://www.snappit.app/explore/triceratops) (*Triceratops horridus*)
- [Stegosaurus](https://www.snappit.app/explore/stegosaurus) (*Stegosaurus stenops*)
- [Brachiosaurus](https://www.snappit.app/explore/brachiosaurus) (*Brachiosaurus altithorax*)

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Source: [Ammonite Fossil: Facts & Places to See — Snappit](https://www.snappit.app/explore/ammonite-fossil)