The meaning of life

If you find this little shell anywhere in the Chalk, you know you’re in a time-specific layer – it’s a zone marker fossil.


Offaster pilula, half an inch on the ruler,
But size is not all, it is said.
You’re a fossilised marker helping sort out the strata,
So your best work is done when you’re dead.

[Photo: nhm.ac.uk]
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