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SDAG Events / Announcements


Hello SDAG Members,

Many thanks to everybody that attended last month's meeting! A special thank you to Markles Johnson for his fascinating presentation. Apologies again Markles, and all, for my brief tardiness, but it was great to see everybody's smiling faces after a long day.

As always, a brief reminder to fill out and send in your 2021 memberships and, if you have the reserves, 2021 sponsorships. The sign up for this year's field trip on October 23-24 will be available very soon. As you know, we will be revisiting the Temecula Valley this year with a real field trip complete with camping, dinner, and beer!

For the meeting this month we are gearing up for the field trip and are excited to welcome Larry Busch! For the new edition of the Temecula Valley book, available for sale now, we included two papers authored by Larry and Russell Miller that look at clays in the Albert Hill area that are rich with impact lapilli and could very well be evidence of the K-T meteor impact. Larry was a stop speaker at the end of last year's road rally and we are excited to make his work with Russ a more prominent part of the field trip this year. Please join us!

In-person meetings remain in-flux, apologies. I know we are all eager to get back to that. Keep an eye on your emails!


-Luke Weidman,
2021 SDAG President

One Stop Wonder to Lusardi Formation in Alpine
Dec. 4, 10am.
EXCITING NEWS! The first official SDAG OSW since COVID is scheduled for December 4th to the Lusardi Formation in Alpine led by Dr. Pat Williams. One Stop Wonders (OSW) are the "Geology Bucket List." No reservation is necessary.

Please arrive, park and be at the "meet here" location by 10am, see map link with information above. The attachment includes the meeting time, location and geologic information compiled by Dr. Pat Williams. See you there!
Field Trip 2021 information
Our 2021 Fieldtrip took place October 22-24.
We explored the Alber hill clays:
  • Lu pisoolitic clay deposits
  • Paloma ring complex in the timescale valley

New Online Series with Pat Abbott Explores "Mother Nature in San Diego"

Back by popular demand, Dr. Pat Abbott, geologist, and professor emeritus at SDSU, will present another online lecture series, this one based on his legendary "Natural Disasters" course at SDSU. Last spring, in a series of online talks, Dr. Abbott discussed the geology of Mission Trails, and he will now take on a different subject: natural events that impact our lives, climate, and shape our landscape.

Dr. Pat Abbott taught at SDSU for 40 years, and many of the university's alumni consider his Natural Disasters course the favorite and most memorable of their college years. The Mission Trails Regional Park Foundation is pleased to present some of the course's topics in this four-part series, "Mother Nature in San Diego." These online lectures will be available free of charge thanks to generous underwriting from SDG&E, and additional support from donors to the MTRP Foundation.
Click here to explore and register for these free, upcoming presentations through Eventbrite.

Climate Change 6PM, Thursday, November 11
Since the Last Glacial Maximum, about 20,000 years ago, Earth has undergone global warming. As polar ice sheets melted, global sea level rose more than 400 feet. Climatic changes have forced human civilizations and migrations to adjust. In modern times, the roles have largely reversed--now it is human activities that are changing the climate. Changes in climate are not necessarily smooth and gradual, they can be abrupt after crossing tipping points. Signs that the atmosphere, oceans, and life are approaching tipping points might be recognized from more frequent extreme events, such as floods and wildfires.

Earthquakes 6PM, Thursday, November 18
Big earthquakes are much like pandemics; you know they are coming, you just don't know when. For millions of years, Western North America has been hit by big earthquakes. Much can be learned about earthquake fault behavior from recent seismic events such as Landers in 1992 and Ridgecrest in 2019. The magnitude 6.9 Loma Prieta earthquake in the San Francisco Bay region in 1989 presents an informative example for us, as the updated earthquake-planning scenario for San Diego is based on a magnitude 6.9 earthquake.

Floods 6PM, Thursday, December 2
The biggest recorded flood in California history occurred during January 1862 when up to 10 feet of rain fell in some areas, with resultant floods killing about 4,000 people. If it happened in 1862, it can happen again. Overwhelming rainfalls are commonly brought by atmospheric rivers carrying volumes of water as great as 25 Mississippi rivers. Other big floods occurred during hurricanes such as 1858 in San Diego and 1939 in Long Beach.

Floods in 1916 in San Diego wreaked havoc in San Diego valleys. Flood protection locally is uncoordinated, as can be seen in Mission Valley during and after heavy rainfall. Our urbanization brings unintended consequences that commonly increase the heights of floods. In a warming future, marine heat waves may aid more hurricanes to reach San Diego.

Wildfires 6PM, Thursday, December 9
Wildfires have become part of California life. Of the 17 largest wildfires in California history, 16 have occurred since 2003, and nine of the 17 have occurred in 2020 and the first nine months of 2021. Wildfires now are more frequent, larger, and hotter. They feature firenados, heat domes with dry lightning, and wildfires have crossed over the granite wall of the Sierra Nevada to burn the eastern side. Vegetation in California is adapted to wildfire, it will burn. Our preparation to reduce wildfires relies on forest thinning and prescribed burns, but they don't always do the job: The Camp Fire that burned Paradise and killed 85 people moved quickly across a thinned-out forest. Our focus needs to be to home hardening, that is making homes resistant to flames, and discouraging further human encroachment into wilderness areas.


Hi, this is Todd Wirths, I'm doing some geology research and I'm wondering if anyone has these original references. Please contact me at if you can share, thank you!

Kennedy, Michael P., 1969, Preliminary geologic maps of portions of SanDiego City, California, Calif. Div. Mines and Geol., Open File Reports 69-1 (DelMar sheet), 68-10 (Del Mar-La Jolla sheet), 69-13 (La Jolla-Point Loma sheet), 69-14 (Point Loma sheet).

Desert Rats Field Trip


Have an idea for a one-day or half-day field trip?
Want to share your favorite aspect of San Diego geology?
Contact SDAG to schedule your One-Stop Wonder!
Your OSW may be chosen to be included in SDAG's One Stop Wonder Guidebook!

Contact Monte Murbach for scheduling!

In the news ...

Laboratory Equipment for Sale

PHONE: (760) 802-7218

The sum of all the listed items totals $7,745.00. However, we would consider selling everything for $6,000.00 if it was a "packaged deal". If interested please contact Vincent Gaby by phone 760-802-7218, or email
Item Asking Price
Direct Shear Machine - Soil Test Model D-130-B, 110v Motor $800.00
Sieve Shaker - Soil Test Model CL-392-B, 110v Motor $600.00
Oven - Thelco Model 17, 2.9 c.f., 110v $500.00
(2) Ohaus Triple-Beam Scales $100.00 each
(1) Cent-o-gram Balance $200.00
(2) Ohaus "Trooper" Field Scale $200.00 each
(2) Atterberg Limits Set (includes Liquid Limit Machines, Mortars, $100.00 set
Pestles, Drying Tins with Lids and Hand Tools)
(6) Dial Indicators $75.00 each
(4) Dial Indicator Stands $ 6.00 each
(1) Sand Equivalent Test Set (includes 4 Graduated Cylinders, $120.00
Weighted Foot, Cork and Measuring Tin
Large Soil Splitter with 3 Trays $300.00
Small Soil Splitter with 3 Trays $200.00
(21) Sieve Screens (various sizes from 2" to #200) $30.00 each
(3) Sieve Pan with Lids $15.00 each
(2) Proctor Molds - 4" $50.00 each
(1) Proctor Molds - 6" $75.00
Expansion Index Mold $50.00
(2) 10 lb. Drop Hammer $45.00 each
(3) 5 lb. Drop Hammer $35.00 each
(2) Expansion Index Ring (Stainless Steel) $40.00 each
(2) Expansion Index Weight $75.00 each
(2) Brass Water Basin (5-3/4" dia., 1-7/8" height) $10.00 each
Humboldt Sample Extruder (hydraulic jack) $100.00
(3) Hydrometers $12.00 each
Glass Hydrometer Cylinders (5) 1000ml, (2) 500ml, (2) 250ml $500.00
Vase 500ml (sold together)
Hamilton Beach Mixer $60.00
Gilson HM-30 Concrete Pressure Meter $500.00
Forney LA-306 Concrete Roller Meter $350.00
Adam Equipment CPW 75 Scale $150.00
Shrinkage Bar Molds, Steel (1 set of 3) $450.00
(2) Slump Cone with Rod $40.00 each
Soil Sampling Rings (2-3/8" dia., 1" h; 107 brass & 37 stainless) $1.25 each

Hint for first-time use of AmazonSmile: enter "San Diego Geological Society"
because the system will probably default to some other charity


Photo of the month

Stereoscope ad

Stereoscope ad

Free Back Issues of California Geology

Free back issues of California Geology will be brought forth at this month's meeting. Several years are organized in binders, going back as early as 1967! Also, some paleontology texts, yours for the taking. See Todd Wirths at the meeting. Rock on!!

John Minch book

NEW Interactive Fault Map for San Diego

As part of the update for the San DiegoTijuana Earthquake Planning Scenario, Working Group No. 1's "Fault Map Subcommittee" completed the first publicly available bi-national active and potentially active fault map ( This interactive GIS map includes the first publicly available active and potentially fault map locations from the City of San Diego. The map also integrated the faults south of the border for a bi-national cross border view. This map is an on-going project as our knowledge increases about local active and potentially active faults.

You can expand the map legend on the left side to select layers that can be turned on or off for the map view. You can also select from 1 of 12 base maps at the base map icon. You can click on the fault line in your map layer view to see the meta-data source. In addition, the City of San Diego Seismic Safety Study Geologic Hazards & Faults Maps are available in the layer titled "GeoHaz SD City." Please note that the City "Zone 12 Potentially Active" fault layers was not included in this data, therefore you will need to use the City Maps to find Zone 12.

The Fault Map link is available at:

I would like to thank Carolyn Glockhoff for her endless GIS work, Jim Quinn and the City for providing their data and time, Jerry Treiman with CGS for his time preparing the Surface Rupture and providing their new State fault data layer, and Luis Mendoza at CICESE for providing the faults south of the border. Please contact Diane Murbach ( 619-865-4333), Chair for the SDTJ Earthquake Scenario Working Group #1 - Earth Science, if you have any questions, or see any errors on this new fault map.

Diane Murbach
(619) 865-4333
Engineering Geologist, C.E.G.

CALL FOR ARTICLES! SDAG invites members to submit articles on their current research or an interesting project they are working on for publication in the monthly newsletter. The article should be no more than 1 page in length. Photos are welcomed, too! Please submit articles to the SDAG secretary via email.

Absolution by the Sea - Now Open For Business!!
Long time SDAG member and past president, Cari Gomes, has assisted in opening a new brewery-restaurant called Absolution by the Sea, from Absolution Brewing Company. The restaurant is located at 7536 Fay Avenue, La Jolla, CA 92037. Phone 619-202-4152. Come enjoy great craft beer and food with your fellow geologists!

Yosemite Conservancy Outdoor Adventures featuring custom adventures.

Got too many rocks? Are you (or specifically, your spouse...) interested in giving them a good home *away* from your house and garden? Mesa College is looking to collect some rock samples for an inaugural Earth History course. We are specifically looking for sedimentary rocks that include examples of different energy environments (varying grain sizes and shapes) and structures (ripples, cross bedding, planar bedding, graded bedding, etc.). We are also looking to beef up our fossil collection and are looking for all the major phyla: Echinoderms, brachiopods, mollusks (bivalves, cephalopods, gastropods), arthropods (trilobites and more!), corals (Cnidaria), Porifera, Bryozoa, vertebrates (Chordata), etc. Looking for both actual standalone specimens or in the rock still (showing different environments of deposition). We are looking for fossil preservation examples, and also for good trace fossil evidence. Got any sediment grain samples from cool locales? We'll take them! If you have anything else you think provides a good 'story' in the rock, we are willing to check it out! We are collecting ASAP to assess how much needs to be ordered for the fall course. Please contact Jill Krezoski at or Don Barrie at with queries or samples.

ROCK DONATIONS NEEDED: Amy Romano, one of our former student members, is looking for rock donations. Amy is currently attending Humboldt State University and majoring in Geology. She is very involved with Humboldt's Geology Club, and every year the club holds a rock auction to support their activities. If you have any rocks to donate, please contact Amy at

Annual Scholarship Awards by the San Diego Association of Geologists, a program of the San Diego Geological Society, Inc.

A primary function of the San Diego Association of Geologists (SDAG) is to support academic opportunities in geology and related sciences. By-laws of the San Diego Geological Society (SDGS) specify the support of academic opportunity ranging from elementary through graduate levels. The SDAG scholarship program has supported academic research in higher education by awarding scholarships annually to students from two-year and four-year undergraduate and master's level programs. Awards are for outstanding research in geology and related sciences. Nominations are solicited from individual faculty and from geology or related science departments at accredited academic institutions. Evaluation of the relative merit of each nominee is based on an abstract describing the objectives and results of the research being conducted by the student and on the letter of recommendation by the student's mentor or nominating committee.

The annual timeline is as follows:
  • Request for nominations occurs in September.
  • Nomination letters and research abstracts are received by the Scholarship Coordinator in mid to late October.
  • Awardees and their nominators are invited to attend the December SDAG dinner meeting. Scholarship awards are distributed to the student during the December meeting.
  • Students accepting awards are required to give a presentation of their research results usually at a spring dinner meeting of SDAG.
For further information contact SDGS Board at through the Contact Us option


A comprehensive listing of all papers published by SDAG, whether as annual field trip guidebooks or special publications, is available on our website. Entries are sorted by primary author, or chronologically by date of publication, from our first guidebook in 1972, up the San Luis Rey River in 2013, from Coast to Cactus in 2014, and finally over the edge to the Coyote Mountains in 2015. These can be accessed or downloaded as .pdf files. They are fully searchable in Adobe Reader or Acrobat, so if you are researching a topic, "tsunami" for example, you can search for that keyword. This listing will be updated as new books are published. Thanks to Greg Peterson and Hargis + Associates, Inc., for making this possible. See the links below:
SDAG publications sorted by senior author.
SDAG publications sorted chronologically.

Request for Sponsors: 2021 SDAG/SDGS and Publication SPONSORS

On behalf of the San Diego Geological Society, Inc. (SDGS), a public benefit 501(c)3 nonprofit educational corporation, we would like to request tax deductible Donations at our San Diego Association of Geologists (SDAG). The list of paid Sponsors and the forms to become a Sponsor are located on the SDAG web site at:

Your donation will further the SDGS mission to promote geology and related fields in the greater San Diego region, operating through the San Diego Association of Geologists (SDAG), a committee of SDGS. To achieve our primary educational objective, we organize frequent field trips and maintain a program of monthly meetings featuring speakers on current geological topics. We also publish field trip guidebooks and other publications related to geology and natural history. We encourage scholarship and research by awarding scholarships from the elementary through graduate levels. With your $100 "EMERALD" donation, your name/business will be listed as a sponsor on the SDAG web site ( and in the monthly SDAG meeting newsletters. With your $500 "RUBY" or $1,000 or more "DIAMOND" level donation, your business card will also be included on the SDAG web site and in the monthly SDAG meeting newsletters. In addition, as a "$1,000 or more DIAMOND" level donation you will be presented with a thank you plaque.

Should you have any questions regarding a Sponsorship, please contact our non-profit SDGS Secretary (Diane Murbach) at 619-865-4333.


As many of you are aware, the San Diego Geological Society (SDGS) was formed in early 2010 as an official non-profit 501(c)3 corporation, and SDAG is now an organization under this corporation. The reasons for doing this were many and they are spelled out in an informational sheet, the Business Plan of SDGS. The officers of SDGS should be very familiar to you, as they are all past presidents of SDAG. For those of you that would like to read more about SDGS and what it means to SDAG, check out the informational page on the website. Also check out the website

GSA meetings

GSA Annual Meeting in Denver, Colorado

Annual Meeting 9-12 October, 2022


If you want to complete your collection, or just see what SDAG was up to in the 1970s, check out our website's publication page, and scroll all the way down: In addition to our very first publication in 1972, a field trip to Otay Mesa, you'll find our 1973 Geology and Hazards of San Diego volume, the first of two guidebooks to the Coronado Islands, in 1978, and our 1987 field guide to the gold mines of Julian. Happy reading!

Short-term rental or long-term lease. Warehouse from 3125 to 6250 sq. ft. Two remodeled offices. Mix and match to meet your needs. Ideal for geotech operations; best possible rates, and we are geology friendly. Contact Lowell Lindsay at Sunbelt Publications 619-258-4911 x110.

SDAG Wear - Monte (Murbach) has a variety of shirts, hats, visors and even a nice vest with the SDAG logo. A small selection is available for purchase at the meetings; all SDAG wear can be ordered from Monte.

DO YOU HAVE AN ANNOUNCEMENT?? Do you have an event, job opening, field trip or other announcement you would like to share with our members?? Just call or email our SDAG Secretary.

San Diego State University

Wednesday seminars, 1 - 2 pm, SDSU in the Chemistry-Geology Building, room CSL-422. Check for details.
Department of Geological Sciences
San Diego State University
San Diego, CA 92182-1020
FAX (619) 594-4372           VOICE (619) 594-6394
*****Parking near campus is limited. There are two lots of meters on the SE side of campus off College, for example and it would be about a 5 minute walk from there. The first lot is meters, and the deeper lot is less expensive ticket machine. *****
The Gordon Gastil Endowed Scholarship Fund continues to seek donations of any amount. Gifts of $ 500.00 or more will be recognized on a plaque to be placed in the remodeled Geology Building. Donations can be sent through SDAG, or contact Pia or Marie, Department of Geological Sciences, SDSU, at (619) 594-5586.

AAPG Student Chapter
American Association of Petroleum Geologists - San Diego State University

Jennifer Luscombe (current student M.S. student at SDSU) and the SDSU-AAPG student chapter officers are beginning the 2016/2017 academic year. Their intention is to support student interest in petroleum and geology related fields. The AAPG student officers are currently organizing an event to stockpile the students with geology supplies and funds to attend the AAPG event in Las Vegas and GSA event in Denver. Details of the event will be forthcoming.

Association for Environmental Health and Sciences

Association of Environmental and Engineering Geologists
AEG San Diego Chapter
AEG Inland Empire Chapter

Coast Geological Society

Inland Geological Society

Los Angeles Basin Geological Society

Meetings are generally held the 4th Thursday of the month at 11:30AM at the Grand at Willow (check their website for their newsletter, for more details, and to make a reservation). Reservations Are Essential.

Society for Mining, Metallurgy, and Exploration, Inc.,
Southern California Mining Section

South Coast Geological Society

The SCGS usually meets on the first Monday of every month, in Orange County. For more SCGS information, visit their website at:

West Coast PTTC

Check the West Coast Petroleum Technology Transfer Council website for workshop date and location.

Our website manager, Carolyn Glockhoff, can create a link from any Corporate Sponsor's listing on the SDAG website to its company website, if one exists. Also, please send the URLs of your favorite geology sites to for listing on the Geologic Links page. These could be data resources, schools, useful government contacts, geologic software, contractors, laboratories, your own company's website, or anything you think would be useful to your colleagues.

DO YOU HAVE AN ANNOUNCEMENT?? Do you have an event, job opening, field trip or other announcement you would like to share with our members?? Just call or email Nadja Scholl - 2020 SDAG Secretary. Any news regarding upcoming events that may be of interest to the Association or news of your business can be submitted.

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