Southern California Geology | Gabbro & Pegmatitic Dikes

[@janicemartin1580]

Had to come watch again, to share copy with a young friend interested in rocks. You are such a fun teacher, Todd. After living in Coachella Valley for 23 years, it is fascinating to finally learn about the terranes I traveled through so often. Many thanks for your videos.

[@quinnmarsh]

I've hiked this hill many times but never knew it was such a geologic treasure!

[@tinymetaltrees]

I spend all day polishing rocks and here I am staying up late watching videos about rocks and wishing I had some of those too. I have a 🪨 problem. 😂

[@glenmorrison8080]

Plant and lichen notes: 4:17 _Encelia farinosa_ (brittlebush) white plant in background, also lots at 14:16. 6:15 _Acarospora socialis_ - green lichen on rock, also lots at 8:06. 8:45 _Xanthoparmelia cumberlandia_ - white lichen on rocks, and lots at 15:04. 10:24 _Salvia mellifera_ (black sage) at left. 13:03 _Eriogonum fasciculatum_ (CA buckwheat) - at center.

[@reldude4445]

The king has returned! Great vid, we've been missing you. Your excitement for geology is contagious

[@herbertmilley911]

Excellent lesson, Sir

[@oscarmedina1303]

What a fantastic episode! I wish I was bit younger so that I could explore more easily. This complex is just a short drive from where I live and I'm looking forward to learning more about the geology of S. California. I've always wanted to learn more about identifying Gabbro. Thank you for taking time from your very busy schedule to bring us along with you on your explorations.

[@michaelsanfilippo7433]

Wow! Great presentation. Only about 15 miles from my house. I'm going to go check that out very soon. Thank you.

[@soaringbob]

That site brought back some memories. Paraglider pilots use that hill just up from where you parked your Jeep as a launch site we call Winchester Bowl. There is somewhat of a weed clearing about halfway up the hill where we would launch and fly for hours, then land down by your Jeep. I do remember finding shorl on that hill, and there were also largish books of mica. That last outcrop you dug around in looked familiar! There is also shorl over in the San Gorgonio Pass near Cabazon, but it is now hard to find specimens. I found a couple of pieces last year, but unless heavy rains wash away the surface, it hides from sight!

[@FelixFoto-c4g]

Thanks, always love these videos, and many times magmatic petrology is more interesting than it seems to be... Merry christmas!

[@SkepticalRaptor]

I love your enthusiasm for the geology of Southern California. Thanks for doing this.

[@Jennifermcintyre]

Very cool!! You’re in the hillsides and the “neck of the woods” where I grew up!! I climbed and hiked the area surrounding Hemet and surrounding areas! Now I’m one of the few people living in Inyo County! I see you’ve done a couple videos up here and on to Mono County. A person with your interests could explore every day up here and never run out of amazing findings!!

[@cewaffles]

I've lived in the IE and have often wondered about the Mountain/Hill ranges around, and their faultlines. The Hills along the 60 freeway (The Jurupa Hills), and the rock lines in them, I've always found interesting.

[@Jennifermcintyre]

The area between Moreno Valley and Beaumont called “the badlands” are a trip too!

[@Djkommode]

I’m still requesting you to do Teneja Falls. The falls have a great diverse rock formations.

[@virginiaevans853]

Watching this late, but the Diamond Valley lake has fantastic geologic features as well as paleontology. All sorts of animals found when they were building the dam. Mastodons, extinct horses, and much more.

[@salfarfan7946]

Dude, unless I’ve missed some notifications, where the heck have you been?!. I really kinda started getting into your channel and then you disappeared all of a sudden. I’m in Northern California, Vacaville to be exact and so wish I was closer to your area of exploration. But I love your travels and videos nonetheless. I see everything ( the minerals) in this video at the Rock Shop in Vacaville, you’re ever in the area stop by the Rock Shop and explore that place, so much fun in there.. Anyway, so happy you’re back!! Sal

[@robertdiehl1281]

Thanks for the geology lesson(finally lol)in an area of SoCal I have been driving through or around for 60 years.

[@DanaDetterich]

Cool! I truly appreciate your enthusiasm and Jeff Corwinesque presentation style. We travel a lot, and I buy Roadside Geology books to read and narrate the geology we drive through. Found your channel and diggin’ it big time! Thanks again!

[@patrickkillilea5225]

Great Video!

[@raenbow66]

Goodness sakes!! Wow. You've gotta be kidding! Todd, you've found fabulous examples of so many features and explained them all so well! I hope you do more. ("An embarrassment of riches." 😉) Wow. ❤ (+You know reggae is 👌🏼.) 😅 omygosh at every turn. Bucket List!! Thank you so much.

[@alanmohn4146]

I grew up hiking these hills and still live in the area. You gave the best explanation I have heard on the composition of minerals.

[@alpineflauge909]

world class content

[@Rachel.4644]

Oh, yes, here we go again! Fascinating, interesting, cool rocks... and it's a place to hike to. I love that you included a paper, too. Thank you for taking us along, it's helpful to see through your eyes. Garnets! Is schorl more usually used to describe tourmaline? I've been to that area pre-geology; who knew such crazy diversity was just waiting there! Wow! (🎶🎶👌🏼)

[@BjarneLinetsky]

I like to think of SoCal as an area of crustal thinning, with magma oozing up through cracks in the crust. If you look at Panamint valley which is a long thin crack, you can see black mounds of basalt all along the length.

[@centralcoastbound]

Good to see you back on KZbin!

[@stevengeorge5605]

Gnarly-a new Geologically Speaking video! You gotta love it! Thank you, Todd!

[@catherineromero1862]

I’ve just stumbled across your channel today. I’ve been spending a lot of time up at Mill Creek /Forest Falls and the rock there is fascinating. Here’s a hint that a video on that area would be much appreciated! 🪨

[@FlagPony]

Great job! loved watching this video. Many blessings from the “Little Three Mine”Ramona, California. ⛏️

[@larrywynn9092]

Some of the best geology stuff on the whole internet. Merry Christmas from Germany.

[@amariebeaubien]

those were some huge hornblende crystals! Amazing. and then the beautiful schorl after in the pegmatite! Very nice!

[@lauram9478]

❤❤❤ great video! Interesting to tag along!! Thank you!

[@bakhtar123]

I learned a lot from your geology hikes. Thank you

[@jennasyseng]

Great video, and right in my backyard too! I appreciate your enthusiasm about what you find and for sharing your knowledge about the local geology.

[@cynthiaberman3798]

Wonderful video! Thank you so much. I hope you continue to film in 2024. Happy new year!

[@karlbarros2849]

I know those hills. Too damn many big rattlesnakes. Went for some rose quartz. Came home with a hat band. Thanks for the video.

[@PlayNowWorkLater]

That gabro looks a heck of a lot like a granite.

[@oconnordd2007]

great episode, educational

[@nitahill6951]

Thank you so much. An extraordinary outcrop of rocks!

[@hiker1658]

Thanks for the new video. Love it!

[@the_quaint_gypsy]

I live right by there and used to hike that hill everyday. I bet had I known you were there, I could have seen you out my front window if I used my binoculars. LOL there used to be a "road" there that is pure rock. The off-roaders would try to make it up and down and there were black skidding tire marks from the vehicles trying to make it up to the top as well as from them sliding down it. It's sad to know that the Western side of the hill will be gone once the highway 79 realignment project is started and completed. They plan to use the hill to grind down and use as filler for low laying areas.

[@benused734]

Excellent work

[@appliedstratigraphix6844]

Fantastic video!

[@yakaronielyak8299]

Quality educational geology video for Socal

[@berthaduniverse]

Well, I had to stop by and say thanks for expanding my understanding of "pegmatitic" rock. Here I thought it had to do with a secondary injection of hot/high pressure material into a hot solidifying rock body, and that the insulation in that rock body allowed slow cooling and differential crystallization to occur... Any recommendations for further reading?

[@glenmorrison8080]

As a botanist, people are always humored when I casually use the word "botanize". But it's a common and long-used word. Didn't know the geologists did the same grammatically!

[@glenmorrison8080]

Lol, I've also botanized very close to there. Did a project on Double Butte and on the south edge of the Lakeviews. Haha. This will be fun to watch.

[@charlesward8196]

As a botanist are you digging on the Encilia farinosa, aka Brittlebush? Sadly, not in bloom.

[@glenmorrison8080]

@@charlesward8196 Yup. Noted it in another comment in fact!

[@Bloodknok]

Very interesting - thanks for making this. Those gabbros are excellent.

[@jaym8257]

You described pegmatite as a crystal size term of over 1 cm. You showed hornblend crystals over that size but did not describe them as pegmatitic. Now I learned that there could be mafic pegmatites but those you showed were silicic as pegmatites commonly are. These I suspect were late stage injection of a differentiated magma that was enriched in silica?? That is an interesting process in its' own right. Gabbro and silicious pegmatite seem as incompatible as basalt and rhyolite. But those exist in proximity in Iceland in certain areas for particular reasons. There is a lot going on in a magma body deep underground.

[@jamescuratalo2609]

Fantastic video. Thank you. I can’t believe you didn’t run into a rattlesnake or two!😬

[@johnlord8337]

If you bring along one of those 8 1/2 x 12 inch plastic wafer fresnel lens - then you can magnify the rock structure to the viewers - and give a greater clarity to what is being talked about.

[@madmaddie4956]

Wonderful wonderful!I that final pegmatite with schorl and garnets was fascinating. Makes me want to check it out! Hope you have posted your spot or area at least to look!! Love you enthusiasm and sharing of knowledge.

[@MrKapeji]

Super video, watching from Pembs UK, a very varied geological region.

[@mikeward7290]

Nice to know that garnets are in the area. I have drove past that hillside many times.

[@calvinhobbs1761]

I know exactly where your standing, lived in Hemet for 12 years. That whole mountain range (San Jacinto and south to the border) is amazing. Question, your book in the video, can you tell us the title and where we can pick one up? Thanks.

[@swatchgirl2]

great video, awesome gabbro!

[@dancooper8551]

Excellent Todd!

[@chakatrain]

Great video, thanks for pointing out the different kind of rocks and taking the time to observe. I love learning things from 😊your videos.

[@ninabjrnersvareid8205]

@ninainorway Yes THANK YOU, amazing what you found for us there, i loved it so much! I must look through all the pieces in my collection to see if I can find some gabbro! Or bits of pegmatites that contain schorl ! Your enthusiasm and finds and your fabulous way of explaining are a Christmas gift ! Thanks! Happy Holiday!

[@bo6938]

Todd, ur back! Greeeat! Merry Christmas!

[@rogercotman1314]

Thanks for your educational video and the hike up the hill. I'm beginning to think my specimen of Gabbro may be something else. Much for me to learn. 9 like .......

[@345DF]

Good videos. Keep up the good work. In many of your videos (including this one) you refer to a book with some geologic maps of the area. What is the title and author of the book?

[@majornature7878]

Wow, that's great. Here in Germany we very rarely have such large crystals.

[@davidkaplan2745]

The garnets are interesting. They usually indicate metamorphism at a depth of at least 10 miles. Don't know if that is the case here. Great video BTW.

[@StereoSpace]

Is the banding caused by fractional crystallization of the pluton and then separation by density, or are we seeing multiple pulses of magma with different chemistries intruding a partially solidified pluton? Awesome video, BTW. I loved the exploration of this complex.

[@amacuro]

Hi Todd, thanks for the video! Gorgeous gabbros! At 4:27 the chart you show seems to have the amphiboles and pyroxenes mixed up?? I'm pretty sure pyroxenes are more mafic than amphiboles. Just looked up another similar chart in google and it was different from this one. Curious! :)

[@charleskijek5438]

Thank you for a great video. I am moving to the area and am looking forward to exploring. I was wondering what book you have those geologic maps in?

[@bjnslc]

TIL that mafic is a portmanteau of magnesium and ferrous (iron).

[@bee4pcgoldrule.007]

You can tell miners 100 years ago used dynamite there looking for gem pockets.There is Muscovite mica that looks like stacks of silver dollars in san diego. back country, Orange garnet the size of marbles .

[@LanceHall]

I think shawn wilsey also visited that tourmaline site.

[@santinamarie4699]

I live in Southern California and have all the same kind of stones you're talking about. Next to Granite Mountain. We have a lot of intrusive dykes 100 of them at least one of them is quite chubby

[@jlr3636]

When you say "cools slowly" what does that mean? Is slowly one year, ten years, 100, 1000? How long does it take a quarts crystal to form? Enjoying your talks.

[@xinawalsh4294]

A great video but where is Green acres?

[@loriazevedo5994]

Love those rocks

[@charlesward8196]

Is black gabbro with massive hornblende crystals the same rock that is sold as “black granite” counter tops?

[@MarcRasp]

first off, thank you for these great videos. As a non geology professional but with an interest, I really enjoy and appreciate them and others. I have a question, why is there a difference in color between gabbro and basalt. basalt being very dark, I would think as it cooled slowly, there would be still be more dark area with the feldspar and other lighter crystals becoming more visible but still remaining less prominent than the darker ones?

[@MellnikMary]

Why didn😢the garnets grow big crystals when the other - black- crystals were so distinctive?

[@madmaddie4956]

PS do you lead field trips for the public??? Some of want to keep learning after college…

[@bmargolas]

Where can I get the map book you show in the videos?

[@goondoit2989]

Are the hornblend dikes actually all the way through the rocks or are some just on the surface as if it flowed over the rock? Your videos are awesome! Very passionate!

[@geologicallyspeaking]

Thanks! These dikes definitely go through the rock, picture them like sheets within the rock; we just see the edge at the surface.

[@johnlord8337]

Whoa, how long have you been taking a cosmic voyage .... ?

[@vincentklotz5849]

Why do you not explain the different temperatures that each rock melts and freezes?

[@Crowdog1234]

Come on up and check out the Conejo Volcanics. Your video was informative, thank you.

[@bobsteneck8502]

Hey if you ever Near las vegas crystal nevada Mining district. You couldn't write down all the varieties. You find in 1 day. And it all looks volcanic coated With glass underneath

[@internetizmyhome]

23:08 Uh ... phrasing?

[@Gavfool]

awesome video! i cant seem to find much info about hiking here, do i need to get permission from a land owner or can anyone hike it?

[@geologicallyspeaking]

@@Gavfool It’s public and accessible from public streets. There are some dirt roads you can park on and hike in.

[@residentpotato6023]

The hill you are on is known locally as Mean Green. You are not very far from the old Hemet Magnesite Mine and the andalusite/corundum pegmatite.

[@aaronosb7787]

I live next to that hill

[@peterwaroblak166]

Green Acres is the place to be...

[@aaronosb7787]

There is a crystal mine up there

[@aaronmiles2030]

Stick figures dope

[@robtippin9111]

😎

[@rtdgk6439]

You're a beautiful outcrop...

[@bradmaxkristie]

for me, it would make it more enjoyable, for those of us who live by here, to not give away the locations of such finds , they will now be striped and trash left behind, we have so many locations out this way, roc hounds know where to look, just my 2 cents been around these hills along time and seen the scale of the intrusion of more people, just dont give away exact locations,, love the roc formation info, it is addictive