ONCOLITE (STROMATOLITE CONCRETION) (SMALL CUT HALF) - France
« backONCOLITE
(STROMATOLITE CONCRETION)
55 million years old
55 million years old
Montchenot, Villers-Allerand,
Marne, France
A cut half of a nodule known as an ‘oncolite’ from an algal band in the Tertiary limestone.
Oncolites are spherical structures formed by the growth of cyanobacteria (also known as blue-green algae). They are very similar to stromatolites but instead of being dome-shaped, they form spherical nodules. They usually form around a nucleus such as a gastropod shell.
Click on a picture for a larger image
Size: approx. 8.5 x 8 x 1 centimetres
Weight: 262 grams
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