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Model Deinotherium extra large
A bulla is the hearing bone of a marine mammal. Dolphins and whales for example possess this type of bones. These bones can be recognized by their irregular shape. In whales, the can reach sizes up to 10 cm or more. This type of fossil is rather common on Neogene as well as Paleogene deposits worldwide.
Example of a fossilized whale bulla.
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