I found this pebble on the Mediterranean shore at Nerja (Andalucia). It has some rows of plant- or coral-like deepenings "eaten into" the stone, about 5 cm long. What may have caused this?

Thank you in advance for your answer.
With kind regards

Guy Kersch

Post's pictures

piedra1.jpg, 146.14 kb, 800 x 600

Hi Guy,

This is a piece of limestone containing a fossil coral. Nice find!