Geology of Laguna Beach: Caves, Coves and Cliffs
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- เผยแพร่เมื่อ 21 ต.ค. 2024
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Take a virtual field trip of the geology of Laguna Beach to learn how sea caves, coves and tide pools relate to faults, dikes, and breccia - or try it out yourself! Here are the stops:
Stop 1: Three Arch Bay (private access or be a really good swimmer) - Check out the arches and sea caves on the north side and see if you can spot the faults
Stop 2: Thousand Steps - Take a look at the San Onofre Breccia up close
Stop 3: Table Rock - Perhaps the most picturesque erosional feature in Orange County
Stop 4: Treasure Island - Arr! There be tide pools and faults beneath the Montage
Stop 5: Victoria Beach - There’s some breccia and a few small faults, but mostly just pretty
Stop 6: Cress Street - The geologic boundary between North and South Laguna
Stop 7: Crescent Bay Beach - The southeastern point is breccia but the northwestern point is a andesitic dike. Pay close attention to the contact between the dike and the shale - the shale has been folded into a syncline from intrusion of the dike
Sources:
Atwater, Tanya. Tectonic History of Western North America and Southern California • Tectonic History of We...
Fritsche, A. E., Weigand, P. W., Colburn, I. P., and Harma, R. L., 2001, Transverse/Peninsular Ranges connections - evidence for the incredible Miocene rotation, in Dunne, G., and Cooper, J., compilers, Geologic excursions in southwestern California: SEPM (Society for Sedimentary Geology), Pacific Section, book 89, p. 101-146.
Morton, Douglas M., Fred K. Miller, Pamela M. Cossette, and Kelly R. Bovard. Geologic Map of the San Bernardino and Santa Ana 30ʹ X 60ʹ Quadrangles, California. US Geological Survey, 2006.
Stuart, Chalres J. "Lithofacies in the San Onofre Breccia, Laguna Beach to Dana Point, Orange County, California: a preliminary report." (1973): 55-58.
www.crystalcov...
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Im a college student and this was so helpful for my oceanology class, Thank YOU!!
Dude thank you !!!! Working in laguna beach right now on my break and wanted to learn about the city and wow . Thank you 🙏🏽 I always love coming here to chill on the beach I’m definitely a laguna beach south guy now 🤣
Ahhh, starting with Three Arch Bay was excellent. Great job AJ..
Thanks man!
Great job summarizing our TAB faults and Laguna! Let’s go and Geo! A shout-out to Chris!
This is fantastic. Amazing job!!!! I really enjoyed learning about my favorite places.
Thanks so much, glad you enjoyed it!
Glad we saw your video! Very interesting and informative...
(Someone told us we were in it so we found this.)
I'm glad you liked it and that you got a cameo!
Thanks AJ! Super interesting... I’ll never take breccia for granted again.
Thank you Lindsey!
I love this video. Laguna beach was my first beach so it is nice learning more about it.
Thanks!
Fantastic!
another outstanding reveal about Laguna Beach; amazing stuff! faults give rise to all the sea caves, I never knew that! Love that San Onofre Breccia! Thank you AJ. I noticed you are missing your camerawoman.......
Thanks Woody, she's temporarily unavailable :)
Thank you so much! So helpful for my Pomona College Geology class. Since we are on zoom this year my professor wanted us to explore the geology of our city and I had no clue Laguna Beach has it beauty because of Geology.
Of course! Once you learn about geology you can't ever go back to seeing your surroundings quite the same way. Best of luck in your geology class and I'm glad this video was helpful!
@@PoopyArchaeology That does help. At some point I'm definitely going to swim over to the other side and check it out with my new geology eyes. If I take some photos would you be interested to see them?
Yeah, that would be swell!
Super interesting. Thanks for sharing!
Glad you liked it dude! And hope you're doing well, it's been forever!
Omg thank you!! I drove throught this area and went to see the sunset on the park above crescent bay, I am fascinated by geology and had a bunch the rocks were volcanic but didn't know. Thank you for confirming. Definitely going back to check it out with more time. Appreciate your explanations ❤️🙏
I've been looking for a good geology channel for a bit now! Glad I stumbled along you, great content!
Great to hear, thanks!
Thank you... quite informative.
Speaking of volcanic rock, isn't Abalone Knoll above Irvine Cove the remains of a volcano?
I love you AJ, this is absolutely great content!
Thanks my man
Melted bricks dawg
lol not sure if you're being facetious about the "never went to Victoria Beach" comment, but I agree, it WAS the cool kid spot and I think I went maybe twice in high school *face palm*. Another great geo video!!
Thanks Emily, glad that at least one person got that joke!
This is absolutely amazing! I live for this type of information! Thank you so much!
You are so welcome!
Awesome video!
Thanks!
Was stationed at old MCAS Tustin, went to Laguna beach quite often in early 90s.
Seemed like it was pelican something
more more more, one thing about geology and biology. Did you know geology drives evolution? California is a perfect place to see this in action since many wild native plants which have evolved over hundreds of thousands of years can grow on the toxic soils of our State, like serpentine, which. non natives have a tough time on. This allows the native plants to evolve, which is why we have so many unique species here in California which are not seen elsewhere. WHOOOOOT
Great point!
Where do you think the rocks in the breccia originated? You can see very large piece of quartz in it.
Hi Jerry, you can find the parent rock of many of the clasts in the San Onofre Breccia on Catalina Island - I get into this a little bit in another video (the link begins at the part I'm describing) th-cam.com/video/qQYSIm3l_Zc/w-d-xo.html
Where did you learn all this?
Hi Jerry - one of the best ways to learn about local geology is to find a geologic map. They tell you what type of rock is present in an area as well as its age. From that and with some background knowledge in geology you can put together what happened to create almost any landscape. Check out the National Geologic Map Database, it has geo maps for nearly every inch of the country: ngmdb.usgs.gov/ngmdb/ngmdb_home.html
Yo Poopy, I really wanted to hear you talk about the cave at Thousand Steps... Hit me up? 😉
Yeah I wanted to get some shots there but there was a couple taking their wedding photos and I didn't think it was worth interrupting their moment to talk about some rocks so...
@@PoopyArchaeology poopy you're too kind 😉
I'm still thirsty for your take! In the summer I lifeguard down there and people are always asking about it. What can I tell them...? 😏
I'm working off just a few google maps photos so take this with a grain of salt, but there's no obvious big fault on the side of the cave facing the beach. However, if you go through the tunnel to the other end it looks like there is breccia on the landward side and sandstone on the seaward side, so there might be a fault there. My guess is that the cave started on that side since it faces the waves and the weaker rock along the fault (that may or may not be there, again just what I'm seeing from bad photos) was preferentially eroded. With time the cave kept getting bigger through wave erosion until it worked its way through to the beach side and created a tunnel. Hope that helps for this summer!
A geologist never takes breccia for granite!!!