The gravity field, shown below as isostatic anomalies, reflects density variations of the Earth's upper and middle crust. Gravity highs occur over crystalline bedrock. Gravity lows occur over Cenozoic (younger) sedimentary rocks.

Gravity gradients commonly occur where faults have juxtaposed rocks of different densities. However, faults are not always marked by gravity gradients, as rocks of similar densities may be juxtaposed along a fault.

Isostatic residual gravity map of the eastern half of the Big Bear Lake 100,000 quadrangle. Click on Gravity Map button for additional versions.

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This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes and does not imply endorsement by the U.S. Government.