Geologic map of the Morena Reservoir 7.5-minute quadrangle, San Diego County, California

Open-File Report 95-50
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Introduction

Mapping in the Morena Reservoir 7.5-minute quadrangle began in 1980, when the Hauser Wilderness Area, which straddles the Morena Reservoir and Barrett Lake quadrangles, was mapped for the U.S. Forest Service. Mapping was completed in 1993–1994. The Morena Reservoir quadrangle contains part of a regional-scale Late Jurassic(?) to Early Cretaceous tectonic suture that coincides with the western limit of Jurassic metagranites in this part of the Peninsular Ranges batholith (PRB). This suture, and a nearly coincident map unit consisting of metamorphosed Cretaceous and Jurassic back-arc basinal volcanic and sedimentary rocks (unit KJvs), mark the boundary between western, predominantly metavolcanic rocks, and eastern, mainly metasedimentary, rocks. The suture is intruded and truncated by the western margin of middle to Late Cretaceous Granite Mountain and La Posta plutons of the eastern zone of the batholith.

Suggested Citation

Todd, V.R., 2016, Geologic map of the Morena Reservoir 7.5-minute quadrangle, San Diego County, California: U.S. Geological Survey Open-File Report 95–50, 12 p., scale 1:24,000, http://dx.doi.org/10.3133/ofr9550.

ISSN: 2331-1258 (online)

Study Area

Table of Contents

  • Introduction
  • Rocks Units
  • Faults
  • References Cited
Publication type Report
Publication Subtype USGS Numbered Series
Title Geologic map of the Morena Reservoir 7.5-minute quadrangle, San Diego County, California
Series title Open-File Report
Series number 95-50
DOI 10.3133/ofr9550
Year Published 2016
Publisher U. S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center
Description Pamphlet: iii, 12 p.; Plate: 32.74 x 30.79 inches;Metadata; Read Me; Spatial Data
Country United States
State California
County San Diego County
Other Geospatial Morena Reservoir
Online Only (Y/N) Y
Additional Online Files (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details