A grazing trace

Trace fossils are the less glamorous geological finds, but can still reveal something about the distant past:

Us gastropods eat algae,
We graze ’em off the rocks
And leave the surface looking
Like a nasty case of pox.

Our ancestors did likewise,
Leaving tracks and trails behind ’em –
They’re what geologists will call
Trace fossils, if they find ’em.

[Photo of Helminthopsis (that’s the name of the trace fossil, not its maker): Mark A. Wilson/Wikimedia Commons]
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