Picked this one up the summer before last and took its portrait without recording too much else about it.
There’s a small fault in there towards the bottom too. Sorry I forgot to mention it. My fault…
Happy Friday! A light rock for “black Friday,” eh? Hope you had a happy Thanksgiving.
I really like your Friday fold series- awesome stuff!
However, here with a chert piece, I agree on the fault, but I question the fold!
Particularly without any locale data, this looks to be a common nodule of chert with banded/zoned coloration relative to its diagenesis. Probably from a bedded deposit with a nodular inclusion or zone. You are looking at a partial cross section, freshly cleaved. It’s natural placement would have been horizontal, not vertical. You can see the ‘left’ dark zone coming back ‘in’ to the nodules thinning edge at the ‘bottom’ of your vertical picture.
I never say never, but I strongly doubt you would get a sharp clean angle like that out of a folded chert bed or nodule without brecciation first(and probable reheal apparent from after.) Just curious, take another look and see what you think!?
Best,
JohnO:
Thanks – you may be right, and we would have to reassign this to the “fauxld” series…
Oh Man, now THAT is an extra-added-value of a pun LOL!
Thanks for the good laugh:)
…and as always- looking forward to what you will be sharing-teaching next post!
Thanks!!
I’ve featured “fauxlds” twice before:
https://blogs.agu.org/mountainbeltway/2012/04/09/pliegue-de-viernes/
https://blogs.agu.org/mountainbeltway/2011/07/15/friday-fauxld/
Enjoy!