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ONCOLITES (COLLECTION OF FOUR SPECIMENS) - 330 million years old - Northumberland

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COLLECTION OF CARBONIFEROUS ONCOLITES

Cut and polished to reveal the internal structure

330 million years old
(Carboniferous period)


Spittal, near Berwick-upon-Tweed, Northumberland

Near spherical nodules known as ‘oncolites’ from an algal band in the Carboniferous 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 fragment of shell.

The price is for all four – one large and three small.

 
Click on a picture for a larger image


Size: 7 x 5.5 x 3 centimetres approx. (large nodule)
Weight: 214 grams (all four nodules)

Price for all four:

PRICE: £18.00
Sorry, this item has been sold or is out of stock