Microfaunal evidence of age and depositional environments of the Cerro Prieto section (Plio-Pleistocene), Baja California, Mexico

Technical Report · Fri Jan 01 04:00:00 EST 1982

DOI:https://doi.org/10.2172/5139631· OSTI ID:5139631

Ingle, Jr, J C

Microfossils including benthic and planktic foraminifera, ostracodes, calcareous algae, fish skeletal material, and fragments of pelecypods were found in 14 core samples from depths of 185 to 1952 m in the Cerro Prieto geothermal field, providing evidence of both the age and depositional history of sediments comprising the 3000-m-thick Pliocene and Pleistocene section in this area. Ostracodes of brackish water and marine origin constitute the most common microfossils present in this sequence occurring in 8 samples; in situ littoral and neritic species of benthic foraminifera occur in 5 samples with planktic species present in 2 samples. Distributional patterns of ostracodes and foraminifera together with previously analyzed lithofacies (Lyons and van de Kamp, 1980) indicate that the Cerro Prieto section represents an intertonguing complex of alluvial, deltaic, estuarine, and shallow marine environments deposited along the front of the Colorado River delta as it prograded across the Salton Trough during Pliocene and Pleistocene time. Foraminiferal evidence indicates that a sand and shale unit commonly present at depths between 700 and 1100 m represents a significant mid-Pleistocene marine incursion in the Cerro Prieto area. Tentative correlation of the Cerro Prieto section with the well dated Palm Springs Formation of the Imperial Valley, California area suggests that the Pliocene/Pleistocene boundary occurs at a depth of approximately 2000 m in the area of well M-93. Reworked specimens of Cretaceous foraminifera and fragments of the Cretaceous pelecypod Inoceramus were found in five samples further substantiating the Colorado Plateau provenance of a significant portion of the Colorado River deltaic sediments in the Cerro Prieto area.

• Research Organization: Stanford Univ., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5139631
• Report Number(s): LBL-13897; ON: DE82020570
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150202* -- Geology & Hydrology of Geothermal Systems-- Non-USA-- (-1989)
AGE ESTIMATION
CALIFORNIA
CERRO PRIETO GEOTHERMAL FIELD
DRILL CORES
FEDERAL REGION IX
FOSSILS
GEOTHERMAL FIELDS
Geothermal Legacy
IMPERIAL VALLEY
LAKES
NORTH AMERICA
PALEONTOLOGY
SALTON SEA
SURFACE WATERS
USA