BCC ExperTalk: "The Geologic History of Southern California" with Eric Cathcart, M.S. (1/30/2021)

[@kathleenbaker2167]

Wonderful presentation! Should have thousands of views. Good visuals, good explanations, clear explanations.

[@geologicallyspeaking]

As a SoCal native I really enjoyed this. Where can I see the rest of your lecture! I saw the next slide was going to cover the Santiago Peak Volcanics!

[@BCConservancy]

This is the entirety of the presentation!

[@MrMartinWebVideos]

Wonderful presentation! Your instruction is very clear. Thank you very much.

[@michaelmiller7371]

Absolutely wonderful presentation.Thank you so much.Your enthusiasm is infectious and left me with a thousand more questions.

[@mrpieceofwork]

TY for this presentation... I just passed half a century of being here on Earth, and have been studying geology ever since I took a few geo classes way back in the 90s. What I NEVER knew up until now, after watching this, is that CA used to be a volcanic island arc. That's wild! Also, I grew up in IB, and saw those Coronados nearly every day, with the most striking one aptly named "Mummy island" for it's shape from that northern perspective. Now I now how they formed, and aren't just really big rocks.

[@Rascilon25]

Thank you for posting this lecture. I learned a lot!

[@MostlyIC]

yes, around minute 35, I do have a question, it seems you're saying the Sierra Nevada and the Coastal/Baja Range are volcanic, but I think of volcanic as being dark-ish basalt-ish, not being white-ish granite-ish, so I'm very confused. I did like hearing about volcanic cores turning into plutons and batholiths, but am confused about their composition as compared to the stuff that did make it to the surface. When I look around in the Owens Valley east of the Sierra I see lots of ancient volcanoes and volcanic flows that are visually very distinct, reds and dark browns, from the white-ish granite of the Sierra. If a volcano can have a granitic core what does the eruption of such a volcano look like ?

[@dereklopez9534]

I'm in rancho Cucamonga California Not far from Mt. BALDY Your 🔥 🙂 Great work Hope you the best

[@noneofyourbusines9976]

Salton butte volcanoes are a couple thousand years old.not a couple hundred.

[@mrpieceofwork]

The oceans are also referred to as "basins"... just need to point that out lol

[@mostlyguesses8385]

Til 100mya wasn't it reverse polarity subduction, off west coast?...