Showing posts with label repost. Show all posts
Showing posts with label repost. Show all posts

Thursday, February 23, 2017

Repost: Here's to You, Geological Heroes

My DSL lines and WiFi, provided by Frontier (or not provided, as the case may be), are currently quite lousy with 50%-plus packet loss. For some reason, Google pages and products, including this blog, work at least slowly and sporadically, as does the NWS weather site. So I can find out how many calories I'm eating (or drinking) while checking out the latest atmospheric river that has most likely been one of the culprits in decimating my internet connection. I can also do a little research by asking Google questions and submitting search terms. If the answers show up in the blurb accompanying the resulting list of search results, then I'm good; if not, I'm stuck with a list of websites that won't open. Consequently, I can't quite finish the current post I'm working on: It needs a little more research. So I'm reposting a post from 2010: a submittal to the now defunct Accretionary Wedge blog carnival. Here it is.



The Accretionary Wedge is coming up soon, so my thoughts are naturally turning to Geological Heroes, the topic of this month's Wedge, hosted at Mountain Beltway by Callan Bentley. Callan says,

I invite all participants (geobloggers and geoblog readers alike) to contribute stories of their heroes. It’s time to pay tribute to the extraordinary individuals who helped make your life, your science, and your planet better than they would otherwise have been.
As far as geologic heroes go, I was first thinking that maybe I don't really have any (or maybe I just don't have many personal ones that I feel I can write about on the blog). I thought, therefore, that I'd list two geologists who are heroes to me, although they aren't personal heroes:

  • Tanya Atwater - a leading plate tectonicist, geophysicist, geologist, and oceanographer. She is a hero to me by way of being a leading and famous woman in my field (or a related field), one who "is especially well known for her works on the plate tectonic history of western North America, in general, and of the San Andreas fault system, in particular...."

    I've not yet had the good fortune to meet her, but long ago (and not very far away) I named a dog belonging to my previous partner and me after her. Upon hearing of this dubious honor from an acquaintance of ours, Tanya A. reportedly said, "Ruff ruff," while making a motion like scratching her ear with a paw.
  • Tom Dibblee - a legendary field-mapping man, who mapped "565 quadrangle maps covering over 40,000 square miles, some fourth of the State of California." I first learned of his mapping while working in the Mojave, where his maps cover nearly every square inch of ground and provide the basics and details for every geological map that has come after him. He is known in that region for not having to use a Brunton to take strikes and dips (except when beds were dipping at shallow angles), because his sense of orientation and angle estimation were excellent, such that he was always within a couple degrees. He started mapping when in high school, and never stopped, completing a mapping career of almost 80 years only when he passed away in 2004.
Beyond these two, I was sitting out on the rig one day, and while thinking that I'd just leave this post at a two-person list I realized that the topic "Heroes" was making me think of Waylon and Willie, and I started singing "Mamas Don't Let Your Babies Grow Up To Be Cowboys."

Don't let 'em pick guitars and drive them old trucks...
[technically a road song because it mentions trucks] and then that somehow led me into "All My Heroes Have Always Been Cowboys" followed by "Waylon, Willie, and Me."

Now, not all the lyrics of these three songs are applicable to whatever particular feeling they engendered in me on that recent field day, nor are all of the lyrics particularly applicable to the topic of geological heroes — except that:
When I start thinking about the real geologist heroes I've known over the years — whether male or female — they are rather much like cowboys, or like outlaws: out in the field all day, bouncing around in pickup trucks old and new, doing their own thing, making it on mottos such as "it's easier to get forgiveness than permission" or "it's all changed now," running their own programs, districts, and companies, shooting cans, rolling boulders, and participating in other shenanigans that shall go unmentioned here, some of which have involved various forms of (legal in Nevada) explosives.

These more personal heroes of mine include my thesis advisor(s), my major professor, the professor I T.A.'d for, several former professors and T.A.'s, many geologists from both Northern Exploration Company and Former Mining Company and elsewhere, the two Larry's, the two Nancy's (you *know* who you are), most of my former field assistants — one has or is now running her own company, one patented her Hg-gas sniffing method and has run her own lab, one is now running her own exploration group at a major mine, and some have gone on to other things but are nevertheless heroes to me for making it in the "man's field" of exploration and mining geology.

My heroes, over the years and decades, have also included several FOP/Quat people: JODavis, Bud Burke, Marith Reheis, and anyone who was present for the flying Vee in the middle of the Black Rock Desert in 1987 or who made it to the 1991 FOP down in Fish Lake Valley, Nevada.

And then there are some true outlaws or aspiring, wanna-be outlaws — hmm... should these names go unmentioned? (You know who you are: R, BS, JS, PG, S+D, et al.)

Really, when it comes right down to it, there are too many geological heroes to list, refer to, or name, including all the consultants and independents attending the hospitality suites and receptions at Northwest every year, going back to the wild S+D bashes in Spokane some thirty-plus years ago.
And so, here's to you (all of you)...
...from a copy of a print from an original slide taken here at a now burned-down hot spring cabin, by JODavis in the fall of 1981, photo credits to JODavis and LLLackey, photo ©2010 Looking for Detachment, all rights reserved, poem written by SH and CR.

The Spencer Hot Springs cabin, with roomy concrete bathtub and piped in hot water, was burned down later that year or the next, reportedly by the same individuals who, in their over-zealous righteousness crossed out in red marker the name "Asshole" (and other cuss words written on the interior of the cabin) — these individuals were apparently disturbed by the existence of such a den of iniquity as a hot spring where people *gasp* sometimes bathed naked. I don't know who these red-marker people were, nor do I really know that they were the arsonists — but that's the way the story goes.

The original from the 1978 album "Waylon and Willie."

April 2010 Accretionary Wedge: Heroes

Friday, March 15, 2013

Repost: Blackhawk landslide, California - from Pathological Geomorphology

This article was originally posted at the soon-to-be-defunct Posterous.com site, Pathological Geomorphology, and was transferred here (thanks Kyle!) to the active Pathological Geomorphology (Tumblr). My original post was a response and addition to Callan's Blackhawk landslide post on Posterous, which is now here on the Tumblr site. I've transferred the original photos, added captions, and added a Google Maps location link at the bottom. I've added the original comments (with soon-to-be-dead links to Posterous) at the bottom. Also see this related post here on LFD.



I'm posting a few additional views of the Blackhawk Landslide in California, to emphasize the truly pathological geomorphology of the area. In the views showing slide toe and slide source, I've moved the source area farther into the mountain from the original given by San Diego State [dead (kmz) link originally sourced here]. I've done this based on prior knowledge and published maps. Basically, the entire steep northern face of Blackhawk Mountain is the slide source area.
Google Earth view showing the slide source and slide toe.
Google Earth view looking from above the toe toward the source.
Google Earth view looking from above the source toward the toe.
Additionally, there are other older landslides in the area, most notably the one sometimes called the Silver Reef landslide, which is just east of the Blackhawk. Also, many additional breccias and possible landslide deposits have been mapped in the area. The geologic maps (Big Bear City quad and Cougar Buttes quad) are really awesome, especially if you know how complex the geology really is. There are numerous thrusts from the south, placing brecciated rocks of multiple ages on usually older rocks. In at least one place, bedrock has been pushed over one of the older breccias. Or is it really bedrock?

Back in the 1980's, I mapped a large area of Blackhawk Mountain and surrounding areas at 1inch = 500 feet. I found, and so have others working in the nearby northern slopes of the San Bernardino Mountains, that if you start at the top, clearly in bedrock, sometimes brecciated, and map down, then you will be tempted to map bedrock until you are clearly in landslide debris. If you start from the top and map up, the opposite is likely to happen.
Google Earth aerial view.
Aerial view with annotated geology.
The reason for northward thrusting is the bend in the San Andreas fault, causing the westward, southward side to be pushed northward, breaking over the steepened San Bernardino Mountains in low-angle faults. The thrusts cause brecciation, and the steepening, brecciation, and low-angle faulting predisposes the area to massive sliding. Stratigraphy is somewhat retained in the slides, and gold has been mined from nicely pre-broken landslid rock of the Blackhawk Slide. Silver occurs in somewhat disturbed veins in the Silver Reef Slide.

In the annotated view, the Younger LS deposits (yellow) are Holocene or late Pleistocene; the Older LS deposists (turquoise and pink) are middle or early Pleistocene; the Moderately Old LS deposits (purple and orange) are middle or early Pleistocene; the very old debris flow fan deposit (purple) is middle or early Pleistocene; and the QT Breccias (blue and red) are Pleistocene or Pliocene.



Lockwood DeWitt responded:
Lockwood DeWitt
Nice! The annotated map/image at the end really help clarify the messyness of interpretation here.
Silver Fox responded:
Silver Fox
And it doesn't even show the really screwed up bedrock!
Katharine North responded:
Great images, Silver Fox! I'm going back and forth between the annotated image and the non-annotated ones, looking at the landscape differently each time, picking out the details. I like your note about the effect of where you start mapping - good to remember!