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Graptolithina were a sort of worm that lived in the Cambrian and Carboniferous. You can find their fossils all over the place apparently, including in the Lake District. They have often been mistaken for pictures of some kind.

Crossposts: http://louisedennis.livejournal.com/347158.html

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From:

angelofthenorth

Wow.

From:

liadt

They do have a nice modern interior design look. Also like the fossilised maltesers;p

From:

purplecat

Some of the fossils have a kind of spiral design which looks remarkably artificial!

From:

fififolle

Worms? Ew :D I shall have to keep my eye out!

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Fossil Friday: Graptolithina

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