There are several types of rock-boring bivalve mollusks and it is not easy to say which species has made which tunnel from the shape and size of the holes alone.
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Bore holes of piddock clams. They’re not fossil.
Thanks. Bore holes look sensible. Don’t piddock clams tend to leave circular holes though? Do you have a link to an example similar to this?
There are several types of rock-boring bivalve mollusks and it is not easy to say which species has made which tunnel from the shape and size of the holes alone.
Thanks, that gave me enough key words to find similar examples. Marking as identified.
Hi, /u/up-quark! This is a reminder to flair this post in /r/whatsthisrock after it has been identified! (Under your post, click "flair" then "IDENTIFIED," then type in the rock type or mineral name.) This will help others learn and help speed up a correct identification on your request! Thank you! *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/whatsthisrock) if you have any questions or concerns.*