Found in a creekbed in Montana and posted in the whatsthisrock subreddit, where there is a detailed explanation of how such a complex pattern could evolve.
Posted for the delightful image, which as an old rockhound I find fascinating. The explanation about how cracks can form in quartz because of differential strain between hard quartz and soft(er) surroundings is well over my head, and I will never remember that this is "the very first phase of boudinage," but it is a cool image and belongs in the blog.
Addendum: A tip of the blogging cap to a reader who provided two excellent link in their comment: a detailed explanation of the process of boudinage, and a relevant video on the topic. Both are well done academic presentations.
Of course there's a subreddit on this...love that.
ReplyDeleteBeing a Geologist myself, this one is unusual to me. When you use the term boudinage, the ones shown at this site are more typical https://www.alexstrekeisen.it/english/meta/boudinage.php when talking about a ridge layer. The process shown at around 5:45 in this video https://www.youtube.com/watch?v=iIGFPYXsh2I is the one I think of when boudinage (sausage shaped) is used.
ReplyDeleteThank you anon. Both are excellent. I have incorporated those links into the body of the post.
DeleteBetter late than never with this. Like 3 days trying to remember the name of this fossil That has a striking Resemblance To your rock.
ReplyDeletehttps://en.wikipedia.org/wiki/Archimedes_(bryozoan)
An interesting similarity.
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