The white stuff is some sort of algae. The short dark markings are where snails or limpets have grazed on the algae leaving the dark rock surface. Interesting in itself but not as exciting as finding a fossil.
Can anyone help identify the cause of the markings I noticed on the rocks at Thurso beach?
Photos posted in photography section at http://forum.caithness.org/showthread.php?t=44741
The white stuff is some sort of algae. The short dark markings are where snails or limpets have grazed on the algae leaving the dark rock surface. Interesting in itself but not as exciting as finding a fossil.
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