What sort of white rock with lots of small holes is this?
This interesting pebble caught my eye the other day when I was wandering around on an Anglesey beach in Wales, UK but I haven't a clue what sort of rock it is and what has caused the little holes in it.
Parts of it are smooth while others are covered in holes (see below)
Any suggestions would be greatly appreciated - I am just really curious :)
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That looks like fossilised coral (possibly a sponge?), the outside is smooth because it's been worn down by the erosion of the sea.
There is quite a lot of fossilised corral on the north Wales coast, it was once a shallow, tranquil, tropical Carboniferous sea
The Carboniferous period from wiki:
The Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 358.9 ± 0.4 million years ago, to the beginning of the Permian Period, about 298.9 ± 0.15 Ma
Making it about 300,000,000 years old!
It's a very nice specimen BTW
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