The Lompico Sandstone is a sedimentary rock formation of lower to middle Miocene age. It overlies the Salinian basement rocks of Santa Cruz County, California. It interfingers with and is overlain by the Miocene Monterey Formation. These are in turn overlain by the mid to upper Miocene Santa Margarita Sandstone which is in turn overlain by the upper Miocene Santa Cruz Mudstone.
There are numerous occurrences of this rock strata including coastal mountain ranges from Northern to Southern California. In the coastal range of Santa Cruz County the formation has been documented in the Zayante Creek watershed. The formation is often associated with groundwater recharge areas.
- Garrison, Bob; Moore, Casey; Aiello, Ivano (2003). "Late Miocene Fluid Migration System: Carbonate Seep Structures and Clastic Dikes". CiteSeerX: 10.1.1.150.6791.
- C. Michael Hogan, Leda Patmore, David Crimp et al. 1978
- David C. Estrada, John Ricker, Robert Aston. 1979. San Lorenzo River Watershed management plan: hydrology technical section, Santa Cruz County, California
- C. Michael Hogan, Leda Patmore, David Crimp et al., San Lorenzo Basin Groundwater Recharge and Water Quality Study, Earth Metrics Incorporated, Association of Monterey Bay Area Governments, July 7, 1978
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