Hello everyone
apologies in advance for my ignorance - I'm a photographer so all this is unknown terrain for me!
I'm currently photographing some shells I found on a beach in Colombia, and I'd like to know what exactly has caused their strange appearance.
To me it looks like something has eaten away at the actual shell and formed deposits on it, but I could be completely wrong. In any case it would be nice to know, so if anybody can shed light on this I would really appreciate it!
Here's a photograph of one of the shells:
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GeologyRocks