2014 Pacific Section SEPM Fall Field Trip

PACSEPM Fall Feild TripCONTINENTAL EXTENSION OLD AND NEW AT THE EDGE OF THE MOJAVE

November 8-9, 2014

FIELD TRIP OVERVIEW

This year’s Pacific Section SEPM Fall Field trip will look at an excellently exposed section of the Meso-Neoproterozoic Pahrump Group (pre-Cryogenian Crystal Spring, Horse Thief Springs and Beck Spring Formation, Cryogenian Kingston Peak Formation and Ediacaran Noonday and Ibex Formations) in the Silurian Hills, as well as newly-described Miocene rock avalanche megabreccias in the northern Salt Spring Hills, with the goal of understanding the challenges of how to fit the deposits into a broader basin analysis context. Detailed correlations with regions outside the Mojave are challenged by complex faulting, magmatic overprinting, and a poor understanding of original basin geometry.

The Silurian Hills and Salt Spring Hills are found at the northern border of the Mojave Desert, at the eastern terminus of the Garlock Fault and south of Death Valley. During the Meso-NeoProterozoic, this region shifted from one of intracratonic platform to the leading edge of a new passive continental margin (Laurentia, formed from rifting of the older Rodinian supercontinent) .

North and northeast of the Silurian and Salt Spring Hills, , Neogene extension has exposed large swaths of time-correlative Proterozoic strata in such well-studied locales as the Panamint Range, Saddle Peak Hills, Kingston Range, and Alexander Hills. To the east lies the Shadow Valley, the location of spectacular Neogene extensional basins with thick sedimentary deposits, including enormous megabreccia sheets representing far- traveled rock avalanches. South and southeast, significant exposures of Mesoproterozoic (and rare Paleoproterozoic) basement complexes of the Mojave Province are found in low relief hills. Recent crustal thinning in the area enabled extensive basaltic volcanism and young cinder cones and flows found throughout the area. Directly south and west of the area, late Permian through Cretaceous granitoids formed during the arc magmatism which obliterated the older rock record, although greenschist-grade windows of metasediments are preserved.

In contrast to the extensive normal-faulting within the Basin and Range province, the Mojave Desert is dominated by strike-slip faults and lateral translations which make direct correlations difficult. Similarly, understanding the geologic setting during major Miocene unroofing and extension is challenged by lateral translation, magmatism and uplift, and lack of appreciation for long run-out rock avalanches. . The Salt Spring Hills are the westernmost expression of the megabreccia deposits well-described from the nearby Shadow Valley area and Valjean Hills.

PS-SEPM Fall Field Trip 2014 Announcement (PDF)

PS SEPM activities at 2014 PSAAPG-PSS​EPM-PCSSEG Annual Meeting

The PSAAPG-PSSEPM-PCSSEG Annual Meeting in Bakersfield is rapidly approaching.

Here is an overview of PSSEPM’s technical activities

Field Trips:

FT 1 – Depositional Environments of Oligocene and Miocene Rocks of the Cuyama Basin: A Trip in Commemoration of Dr. Gene Fritsche

Join us for a day in the field to commemorate the life of Gene Fritsche. The Cuyama Basin was a favorite area for Gene and was the site of his PhD dissertation research as well as the location for several of his students’ MS projects. Our trip will focus on the mid-Tertiary transgression that is so prominent in many of California’s coastal basins. Outcrops we plan to examine include the Simmler, Vaqueros, Monterey and Branch Canyon Formations. We’ll discuss sedimentary structures and their depositional significance. We will view outcrops on hikes of moderate difficulty and that are up to 2 miles in length.

FT 3 – Westside Turbidite Systems

Turbidite sandstones are one of the more important reservoir types of the San Joaquin Valley oil province, and for more than a hundred years turbidites have contributed to a significant amount of the production coming from fields in the southern San Joaquin. The westside of the basin provides a unique setting where it is possible to study turbidite outcrops that are located in some cases less than two miles from the very fields where these same rocks produce. This field trip will visit some of the classic westside turbidite outcrops and will include examples from the Miocene Stevens and Carneros sandstones, and the Eocene Point of Rocks. Excellent exposures that include some of the type areas for these units will provide us with opportunities to review terminology, identification, and the mechanics of deposition, and to discuss depositional models, provenance and some of the controversies surrounding these fascinating rocks. The field trip will include a lunch stop at some historic oil seeps and tar pit workings that have been known and exploited since the days of the pioneers.

Short Courses:

SC 3 – Sequence Stratigraphy for Students

This two day short course, for students only, provides a historical perspective on the development of stratigraphy in general and focuses on the development of sequence stratigraphy in particular. Sequence stratigraphy is a methodology that uses stratal surfaces to subdivide the stratigraphic record. This methodology allows the identification of coeval facies, documents the timetransgressive nature of classic lithostratigraphic units, and provides geoscientists with an additional way to analyze and subdivide the stratigraphic record. We provide a mix of lectures and hands-on exercises utilizing datasets that were instrumental in formulating concepts of sequence stratigraphy.

SC 5 – San Joaquin Siliciclastic Reservoirs Core Workshop

In this interactive workshop, cores from several different formations encountered in San Joaquin basin oilfields will be presented and discussed. These discussions will focus on facies and reservoir quality signatures, in the context of clastic depositional systems analysis. Logs will be provided, in order to calibrate facies and vertical profiles to downhole data. This workshop will take place at CoreLab in Bakersfield.

Technical Sessions:

Special Session: Fine-Grained Biosiliceous Rocks; the Monterey and Beyond – Chico Martinez

Session No. 8 – Cenozoic Geologic History of Southern California – Dedicated to the Memory of A. Eugene Fritsche

SEPM Reception – Follows the special session

Download PDF Convention Information Booklet

Fritsche Session Call For Abstracts

2014 Combined Meeting
April 27-30, 2014  Bakersfield, California

Pacific Section American Association of Petroleum Geologists
Pacific Section SEPM (Society for Sedimentary Geology)
Pacific Coast Section Society of Exploration Geophysicists

Special Session of the Pacific Section SEPM:
“Cenozoic Geologic History of Southern California – Dedicated to the Memory of A. Eugene Fritsche”

Organizers & Session Co-chairs:

Tony Reid
Occidental of Elk Hills
Bakersfield, California
Mario V. Caputo
Department of Geological Sciences
San Diego State University &
California Polytechnic University, Pomona

This Special Oral Session of the Pacific Section SEPM (Society for Sedimentary Geology) will honor the career achievements of Gene Fritsche, emeritus professor CSU Northridge: sedimentologist, field geologist, field trip leader, mentor, and a prominent institution in the Pacific Sections AAPG and SEPM. The session will showcase recent work of student and professional geologists on Paleogene and Neogene paleogeography, sedimentology, stratigraphy, and tectonism of the Santa Ynez Range, Santa Monica Mountains, San Joaquin Hills, Santa Ana Mountains, White-Inyo Mountains, Cuyama Basin, among other locations in greater southern California to which Gene passionately dedicated his field research.

SUBMITTAL DEADLINE FOR THIS SESSION ONLY: February 28, 2014
SUBMIT ABSTRACT FOR THIS SESSION TO: Jon Allen Jonathan.Allen@chevron.com 

Indicate below the abstract title that the abstract is being submitted for the A. Eugene Fritsche Special Session

Please review PS-AAPG website for information regarding Abstract submittal: http://psaapg.org/2014-convention/

Fritsche Session Call For Abstracts (PDF)

2014 PS-AAPG/PS​-SEPM/PCS-​SEG Meeting- Call for Abstracts

The Call For Abstracts for the 2014 joint Pacific Section AAPG / Pacific Section SEPM / Pacific Coast Section SEG meeting in Bakersfield is now OPEN!  Please find more information and submit your abstract by clicking here:  http://psaapg.org/2014-call-for-papers/

Be sure to include all the required fields.  Once you submit your abstract, you’ll receive an automated confirmation email from the server.  For any technical issues, email psaapg2014@gmail.com

PSAAPG_2014_Call4Abstracts_Page_1

Register Now for the PS SEPM Fall Field Trip

Devonian Carbonate Platform of Eastern Nevada: Facies, Surfaces, Cycles, Sequences, Reefs, and the Cataclysmic Alamo Impact Breccia.

Pacific Section SEPM Fall Field Trip, October 4-­‐6 2013

Field Trip Leaders: John E. Warme (Professor Emeritus, Colorado School of Mines) and Mara E. Brady (Assistant Professor, Fresno State, mebrady@csufresno.edu)

REGISTRATION & LODGING RESERVATION DEADLINE: SEPTEMBER 20

FIELD TRIP LIMIT: 50
Participants PLEASE NOTE that student registration is limited to 8 students per college/university

Mail in the Registration Form Below

Download PDF Image

REGISTRATION FORM

Fall 2013 Field Trip Announcement!

FIELD TRIP OVERVIEW

PS-SEPM Fall Field Trip: October 4-6, 2013

DEVONIAN CARBONATE PLATFORM OF EASTERN NEVADA: FACIES, SURFACES, CYCLES, SEQUENCES, REEFS, AND THE CATACLYSMIC ALAMO IMPACT BRECCIA.

Trip Leaders: John E. Warme (Evergreen, Colorado) and Mara E. Brady (Fresno State, mebrady@csufresno.edu)

Stratigraphic column

Stratigraphic column showing ~250 m of carbonate platform mostly cyclic limestones and dolostones from the upper part of the newly named Fox Mountain Formation, the informal yellow slope-forming member and shallow carbonate platform facies of the lower Guilmette Formation, the newly named Alamo Breccia Member of the middle Guilmette, and the lower beds of post-Breccia limestones and sandstones of the informal upper Guilmette (from Jared R. Morrow, after Sandberg, Morrow and Warme, 1997).

Devonian limestone and dolostone formations are superbly exposed in numerous mountain ranges of southeastern Nevada. The Devonian is as thick as 1500 m there and reveals continuous exposures of a classic, long-lived, shallow-water carbonate platform. Our two-day field excursion will be to Devonian outcrops easily reached from the settlement of Alamo, Nevada, ~100 mi (~160 km) north of Las Vegas. Emphasis will be on carbonate-platform lithostratigraphy, but includes overviews of the conodont biochronology that is crucial for regional and global correlations. These formations are mainly composed of hundreds of partial to complete shallowing-upward Milankovitch-scale cycles and are grouped into sequences bounded by regionally significant surfaces. Dolomitization in the Lower Devonian Sevy Dolostone and Middle Devonian Simonson Dolostone appears to be linked to exposure surfaces and related underlying karst intervals. The less-altered Upper Devonian Guilmette Formation exhibits characteristic shallowing-upward limestone-to-dolostone cycles that contain typical carbonate-platform fossil- and ichnofossil-assemblages, displays stacked biostromes and bioherms of flourishing stromatoporoid sponges and sparse corals, and is punctuated by channeled quartzose sandstones. The Guilmette Formation also contains a completely exposed ~50-m-thick buildup that is constructed mainly of stromatoporoids, with an exposed and karstified crest. This buildup exemplifies such Devonian structures known from surface and hydrocarbon-bearing subsurface locations worldwide.

Of special interest is the stratigraphically anomalous Alamo Breccia that represents the Middle Member of the Guilmette. This spectacular cataclysmic megabreccia, produced by a bolide strike ~382 million years ago, is as thick as 100 m where we will study it. The Breccia may be the best exposed proven impact debris field on Earth. It contains widespread intervals created by the seismic shock, ejecta curtain, tsunami surge, runoff and probable continental margin collapse generated by a major marine impact.

Travel & Logistics: Participants should plan to arrive Friday night for a Saturday 8am start of the two-day field excursion. Registration (details to be posted shortly) will include a complete printed field guide.

On Saturday, the group will visit Hancock Summit, where participants can observe and discuss (1) carbonate facies, cycles, and surfaces and (2) the Alamo Breccia and its bolide impact signatures.

On Sunday, we will visit Silver Canyon, where participants will investigate (1) the upper interval of the Alamo Breccia, which contains large clasts of platform carbonates and clasts of impact lapillistone; and (2) exceptional exposure of a carbonate buildup (Reso’s Reef), lithologies that interfinger with the buildup, and the karstified crest at the top of the buildup.