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Author: Subject: Somewhere in Baja
mtgoat666
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[*] posted on 7-11-2024 at 02:22 PM


Quote: Originally posted by bajaric  
Ahhhh, the old tonalite intrusion into volcanic agglomerates trick! Ha Ha. Somehow the layers of Oligocene host rocks that appeared to me to be recent alluvial material managed to stay horizontal for about 15-20 million years. Impressive!


Many layered basalts consist of volcanic deposits alternating with sedimentary units. Basicly, sedimentary units are weathered surfaces of volcanic deposits, or sediments deposited by wind or water, derived from locally-eroded volcanics (hence the color similar). In this case, I think the soft eroding material in photo is more likely to be sedimentary deposits than volcanic deposits.




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Maderita
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[*] posted on 7-11-2024 at 02:28 PM


Thanks for inquiring David. Please thank the geologist who explained this mystery dike.
I've never paid much attention to extrusive igneous rock in Baja, mainly because it is caca for rockclimbing! With the exception of the basalt cliffs at La Misión, BC., which is solid for sport climbing routes.
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MontyF
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[*] posted on 7-11-2024 at 07:26 PM


Great thread, everyone!!

thanks for the detail and comments

Monty
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David K
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[*] posted on 7-12-2024 at 09:06 AM


My pleasure, bajarik and Maderita. I will forward your replies to 'Geologist Joe' (not his Facebook name).
Rik, he was one of the first of my Facebook friends to buy your book, fyi.




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