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Reconnaissance geologic map of the Loreto and part of the San Janier quadrangles, Baja California Sur, Mexico

Miscellaneous Field Studies Map 2000

Prepared in cooperation with the Consejo de Recursos Minerales de Patrimonia y Fomento Industrial de los Estados Unidos Mexicanos
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Abstract

The Loreto area of Baja California Sur, Mexico, contains a diverse association of igneous, sedimentary, and metasedimentary rocks exposed in the foothills and arroyos between the Sierra La Giganta and Gulf of California. The Loreto area was selected for this study to examine the possible relation of the marine rocks to the opening of the Gulf of California, and to determine the stratigraphic and structural relations between basement rocks composed of granitic and prebatholithic rocks and overlying Tertiary (mainly Miocene) sedimentary and volcanic rocks, and by a sequence of Pliocene marine and nonmarine sedimentary rocks. The Pliocene marine rocks lie in a structural depression informally called here, the Loreto embayment. This geologic map and report stem from a cooperative agreement between the U.S. Geological Survey and the Consejo de Recursos Minerales of Mexico that was initiated in 1982.

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Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Reconnaissance geologic map of the Loreto and part of the San Janier quadrangles, Baja California Sur, Mexico
Series title:
Miscellaneous Field Studies Map
Series number:
2000
Year Published:
1988
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Description:
Document: 10 p.; Plate: 37.85 x 51.15 inches
Country:
Mexico
State:
Baja California Sur
Other Geospatial:
San Janier quadrangles
Scale:
0
Online Only (Y/N):
N
Additional Online Files (Y/N):
N