South Coast Geological Society



South Coast Geological Society Newsletter

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Meeting Date: Monday , October 2nd, 2017
New Location: Dave & Buster’s, 20 City Blvd West, Orange CA

Guest Speaker:  

Sean Loyd, Ph.D., Associate Professor
Cal State University, Fullerton


Salt dome cap rock calcite formation
by the anaerobic oxidation of methane
Significant hydrocarbon deposits accumulate in traps associated with salt domes. Whereas some of this hydrocarbon is extracted for economic uses, a significant amount is degraded in the subsurface as a result of microbial processes that yield mineral precipitates as byproducts. Salt domes of the Gulf of Mexico Basin typically exhibit extensive deposits of calcite that form atop the salt structure as cap rock. Current cap rock formation models invoke salt-hosted evaporite mineral dissolution as a source of sulfate, which microbes utilize to degrade hydrocarbon. Despite model inferences, the specific natures of these microbial reactions remain largely uncharacterized. We find carbonate-associated sulfate sulfur isotope compositions (δ34SCAS) that exceed those of salt-hosted sulfate minerals, implying cap rock carbonate generation via microbial sulfate reduction under closed-system conditions. The widespread co-occurrence of low carbonate carbon isotope compositions (δ13Ccarb) and high δ34SCAS values indicate that sulfate-dependent anaerobic oxidation of methane (AOM) led to calcite formation. Therefore AOM may serve as an important, unrecognized methane sink that reduces methane emissions from the subsurface in salt dome settings. 

Click Here to RSVP for the Meeting!

In this edition:

  • Meeting Information
  • Presidents Corner
  • 2017 Membership
  • Corporate Sponsors
  • Annual Field Trip
  • Poster Session and Holiday Party
  • September Meeting Highlights
  • Geology Fun

Meeting Information
6PM – Social Hour
7PM – Dinner
7:45PM- Presentation
NEW Location:

Dave & Buster’s
20 City Blvd West, Orange CA

Member $30
Non-Member $35

Student/Professor $15

RSVP by Friday, September 29th to avoid the $5 late RSVP fee. 

Sean Loyd, Ph.D., Associate Professor
Cal State University, Fullerton

Speaker Biography:

Sean Loyd, Ph.D. received his B.Sc. in Geology at University of California, Santa Barbara in 2005. In 2010, he obtained his Ph.D. in Geological Sciences at the University of Southern California. From 2010-2013, Dr. Loyd was a UCLA postdoctoral scholar in geobiology through a fellowship funded by the Agouron Institute. Dr. Loyd is currently an Assistant Professor in the Department of Geological Sciences at CSU, Fullerton. His research primarily focuses on the geochemistry of carbonate minerals with particular emphasis on microbial mediation. To explore carbonate mineral precipitation (authigenesis) his lab utilizes a broad spectrum of analyses including sulfur phase (carbonate-associated sulfate and pyrite) and sulfur isotope compositions, trace metal contents, carbon, oxygen and clumped isotope compositions. Specific projects that he currently works on include: Paragenetic evolution and precipitation mechanisms of salt dome cap rocks; Constraining formation temperatures of cold seep carbonates and concretions through clumped isotope analyses; Identification of microbial processes that mediate mineralization of carbonate concretions and their modern analogs in marine sediments; Evaluation of the chemistry of the Neoproterozoic and Paleozoic oceans; and Drivers of hot spring and alkaline lake carbonate mineral formation.

Presidents Corner  

South Coast Geological Society Members and Supporters,

On behalf of the SCGS, I would like to thank Thomas L. Davis for his time and presentation as our September meeting keynote speaker.  Licensed Geologist, Thomas Davis, discussed some of his research on the seismic hazards at the Aliso Canyon and Honor Rancho natural gas storage facilities. The Doubletree Club hotel provided a terrific buffet meal and we had over 50 people in attendance.  We were also able to wish Honorary Member Joan Baldwin a Happy Birthday.  Thank you, Joan, for all your continuing contributions to the society, it doesn’t go unnoticed.  Meeting highlights can be found in our newsletter.

Our next meeting will be October 2nd at the Dave & Busters at the Block at Orange.  Jenifer Leidelmeijer, our secretary, will post links and maps in the newsletter with directions to the venue. If you would feel more comfortable emailing us for assistance, please email us at  We are very excited to try out this new venue.  There should be ample room and a very comfortable environment for our group to conduct our meeting.  We are excited to be hosting Professor Sean Loyd, from Cal State University, Fullerton.  His talk is titled, “Salt Dome Cap Rock Calcite Formation by Anaerobic Oxidation of Methane.”  This is going to be a great meeting and I’m looking forward to seeing all of you there.

On December 4th, we will be hosting our 23rd Annual Poster Session conjoined with our Annual Holiday Party. Student monetary awards and bragging rights will be distributed to the most Outstanding Poster Presenters.  SCGS will award a total of $1000 to awardees.  The Poster Session and Holiday Party will be held at the Dave & Busters in Orange.  Please look for the attached flyer or log on to our website, for more information.  The deadline to submit your abstract and poster title is on Monday, November 27th at 5PM. Please complete your submission early to guarantee a spot. We will also be having our typical Holiday Party Raffle and Silent Auction! Get your festive sweaters ready and for our ugly sweater contest.  Gifts will be awarded to category winners regarding their fun and festive attire.  Donations for our raffle and silent auction are greatly appreciated!

Our Annual Field Trip is scheduled for November 3-5, 2017 and we are very excited to be going to some areas easily classified as “World-Class Geological Sites”.  The trip will commence at the Coachella Valley/1000 palms preserve between 10:00 to 11:30 am on Friday.  I highly recommend that you get there early and allow yourself some time to explore this amazing place. Other trip highlights include a guided tour through Ormat Geothermal plant in Brawley on Friday as well as hiking in the Painted Canyon and Box Canyon, led by Dr. Art Sylvester. Professor Emeritus, UCSB, on Saturday.  Over the past 30 years, Dr. Sylvester has led many tours to and published multiple papers regarding the geology in this area.  Sunday will consist of a half day that includes making short stops at some to the many awesome geologic features around the Salton Sea.  The field trip will officially conclude at approximately 2pm on Sunday.  I’m hoping a few of you will join me at Coachella Valley Brewing for one last responsibly consumed beverage to properly close out the weekend.  The costs have been determined at $175.00 for members and $195 for non-members.  This cost includes BLM camp site costs, food from Friday dinner to lunch on Sunday (6 meals), as well as 5 port-a-potty’s and cost of Guide Book publication.  Fires will be allowed and we are expecting a Tri-tip BBQ Saturday night.  Sign up costs include a printed Road Log book when finalized.  Please Register Online at and pay fees: 1) mail-in check, 2) Eventbrite page 3) PayPal invoice or 4) at our October meeting. 

Student sponsorships are being requested to assist with the cost for students.  Corporate sponsor donations supporting the fieldtrip are also welcomed.  We operate as a non-profit organization and 100% of your tax-deductible donations go directly to the society.  Because of our members generosity we can provide quality meetings, events and fieldtrips.   Please take note of our sponsors in this newsletter or on our website.  Please consider these companies when in need of their offered services.

If you are not already a member of South Coast Geological Society, we would love to have you sign up.  Members receive discounts on meetings, merchandise, fieldtrips and outings.  Student membership is still highly discounted at the unbeatable price of free.  Regular membership remains at 20 dollars for the calendar year.  With fieldtrip sign-ups around the corner its best to get your membership in soon.

Lastly, I’d like to thank all our Corporate Sponsors, devoted Honorary Members, officers, volunteers & members who help make the SCGS function and grow.  Without your contributions and support we wouldn’t be able to accomplish all that we do. 

Greg Shagam
President 2017

Greg Shagam, SCGS President

 SCGS Membership Drive 

We welcome you to join SCGS, one of the largest, most active Geological Societies in Southern California. A membership to South Coast Geological Society has many benefits including discounted meeting, field trip costs, subscription to monthly newsletters, announcements for exclusive field trips, events, job postings and more!

Membership Costs:
Professionals: $20 / year
Students: Free

Membership can be paid online via pay-pal, check by mail, or in person at a SCGS Meeting/Event where we accept cash, checks, and cards. Please visit our membership page for the Online Membership Application and Pay-Pal Payment Link.

Our mailing address is:
South Coast Geological Society
P.O. Box 10244
Santa Ana, CA, 92711-0244
*Membership rates will increase to $35/year, effective in 2018

SCSG Membership Application

South Coast Geological Society Corporate Sponsorship

SCGS greatly appreciates our Corporate Sponsors! Corporate sponsorship allows SCGS to host stellar field trips, provide annual scholarships, and publish guidebooks. 

There are three Corporate Sponsorship Levels,
GOLD – $500 
SILVER – $250
BRONZE – $100

Click HERE for Corporate Sponsor Webpage

 2017 Corporate Sponsors 

Upcoming Events!

RSVP Here!

Dave & Buster’s

Dave & Buster’s is located in the Block of Orange; Address: 20 City Way Blvd West, Building G #1, Orange, CA 92868. It is accessible from the 5, 57, and 22 freeways. 

Directions via Google Maps

Please complete the ONLINE registration, link below. The form will requires participant information, fee information and agreement, field trip WAIVER, emergency contact information, and miscellaneous information (days attending, dietary restrictions, transportation, etc). 

There are 4 modes of payment:
Pay In Person: At a the SCGS October Meeting (cash, check, card)
Pay Online: Please use the Eventbrite website located on the bottom of the Field Trip webpage. Use Eventbrite only if you are paying ONLINE.
Request a PayPal Invoice: Email indicating the amount you want invoiced and we will send a payment request. 
Check by Mail: Make Checks Payable to South Coast Geological Society and mail to:
South Coast Geological Society
P.O. Box 10244
Santa Ana, CA 92711

ONLINE Registration
ONLINE Payment via Eventbrite

Student Sponsorship
South Coast Geological Society encourages student participation in all of our events. However, SCGS cannot do this without the help of our dedicated members and corporate sponsors. Your sponsorship helps SCGS provide discounted student rates for our annual field trip. 

Please contact SCGS if you or your company would like to sponsor a student attendee.

Student Sponsorship Encouraged Donation: $75

Email us about Student Sponsorship

Call for Abstracts: The deadline to submit your abstract and poster title is on Monday, November 27th at 5PM. Please complete your submission early to guarantee a spot. Submit online at OR use button below. 

Student Poster Awards:
SCGS will be awarding up to $1,000 for the most Outstanding Student Poster Presentations!
Qualifications for an award: 1) Present their poster in person 2) Be currently enrolled as a student at any southern California University/College.

Ugly Holiday Sweater Contest: ’tis the season to rock ho-ho-horrible holiday sweaters! There will be a prize for the Best/Worst Holiday Sweater! 

Raffle and Silent Auction: We have an amazing collection of fossils and rocks for our raffle and silent auction, including geodes, minerals, fossils, beer, wine, and more! 

Merchandise and Publications SALE: Selected SCGS merchandise will be 30-50% off! We will also have special deals on our publications! Stop by the pubs table and grab some great stocking stuffers or a great geological book for yourself and a friend!

Call for Donations: South Coast Geological Society is welcoming donations for our raffle & silent auction. If you have any minerals, rocks, fossils, books, maps, crafts, bottled brews or wines you wish to donate we will gladly include them in the raffle and silent auction. We greatly appreciate your donations!

Submit your abstracts now to share your recent work (including completed, active, or proposed theses and projects). Industry professionals, academics, and students are invited to submit abstracts. This is a casual forum for students and professional geologists to share knowledge, experience, and ideas.

Submit Abstract HERE

September Meeting Highlights

Thank you to our members who joined SCGS for another gneiss meeting! There were many familiar and new faces! We hope that you all enjoyed it! And a special thank you to Thomas L. Davis, PG.for your rockin’ presentation on “Fault displacement hazards at Aliso Canyon and Honor Rancho natural gas storage fields, southern California.” It was an interesting and informative talk!

Geology Fun






Copyright © 2017 South Coast Geological Society, All rights reserved.
Our mailing address is:
South Coast Geological Society
P.O. Box 10244
Santa Ana, CA, 92711-0244

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