Geology Cafe

Geologic Map of Northern San Diego County

Geology of the Oceanside Quadrangle (1:100,000 scale)

Switch to Geographic Index Map

Click on individual 7.5 minute quadrangle maps for a larger view.
Geologic Map index to Oceanside 30 x 60 degree quadrange
This map has been modified from "Geologic map of the Oceanside 30'x 60' Quadrangle, California." California Geological Survey, Regional Geologic Map No. 2, 1:100,000 scale.) The original geologic map has been split into individual 7.5 minute quadranges for easier viewing.
Click on individual 1:24,000 quadangle maps for a larger view. Note that topographic map contours and some roads appear overlain on the geology.

Map Information

Map Units (color and symbol index of geologic formations and features illustrated on the map)
Correlation of Map Units
(names of rock units linked to abbreviated map symbols arranged by geologic age).
Correlation of Map Units (Detailed names of rock units linked to abbreviated map symbols arranged by geologic age).
Age of Marine Terraces (Coastal landform and sedimentary deposits associated with the rise and fall of sea level and regional uplift during the Ice Ages.)
Map Explanation (a general description provided from the original map)
Map Scale reference (1:100,000 scale)
Topographic maps (USGS index to 1:24,000 scale maps)

Click here to see the original source geologic map and explanation pamphlet (large .pdf files).

crustal upwarp of the San Marcos Mountains east of Oceanside California

Figure 1. View looking east from Oceanside Harbor. Four geologic regions are represented.
1) Foreground urban development covers lowland marine terraces along the coast.
2) Mid-foreland show low erosionally dissected plateaus of Tertiary age (uplands below 800 feet, mostly in the Vista, Ca region).
3) Distant gentle upwarp of the San Marcos Mountains (uplands underlain by Mesozoic-age rocks and volcanics up to +1,500 feet).
4) Distant higher peaks of the higher Peninsular Ranges (Mesozoic volcanics) east of Escondido, CA (elevations up to +3,000 feet).
Dana Point Quadrangle Margarita Peak Quadrange Falbrook Quadrangle Temecula Quadrangle Pechenga Quadrangle San Onofree Bluff Las Pulgas Canyon Quadrangle Bonsall Quadrangle Pala Quadrangle Oceanside Quadrangle San Luis Rey Quadrangle San Marcos Quadrangle Valley Center Quadrangle Encinitas Quadrangle Rancho Santa Fe Quadrangle Escondido Quadrangle Morro Hill Quadrangle San Clemente Quadrangle