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found a rock and picked it up and throw it on some concrete and broke it and saw this inside, could anyone tell me what it is, its about 3 inches long,
How about a fossil of a sea urchin?
Its impressions on flint of the test & spines of Prionocidaris vendocinensis, a cidaroid type of sea urchin that had very long & slender spines.
One species of Prionocidaris is still found in todays seas but yours
is from the late Cretaceous & around 85 million years old, its fairly common to find broken parts of these in some of the upper chalk but its not very common to find one as nice yours.