Geologic Considerations in Conservation Planning Southern California December 3-5, 2002 JGrim.

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Presentation transcript:

Geologic Considerations in Conservation Planning Southern California December 3-5, 2002 JGrim

Discussion Topics 1.California Geology Southern California Geology (Lunch) 3.Geologic Considerations in Conservation Planning 4.Geologic Hazards 5.Pertinent NRCS Policies & Procedures 6.Available Resources

California Geology 101 P Geologic Time Scale P Rocks P Structure P Plate Tectonics P Process through Time

THE ROCK CYCLE

Rock Types P Igneous P Sedimentary P Metamorphic

Igneous Rocks Intrusive Igneous e.g Granite

Granite Granite Mountains, San Bernardino Co.

Igneous Rocks P Extrusive/Volcanic (e.g. Basalt)

Pillow Basalt P Conejo Volcanics on Kanan Rd, Santa Monica Mtns.

Cindercones P Red Hill, just north of Little Lake near 395, Inyo Co.

Volcaniclastic Rocks Ricardo Group, Red Rock Canyon, Kern Co.

Sedimentary Rocks P Sandstone

Sandstone & Shale Sespe Formation near Casitas Pass, Ventura Co.

Sedimentary Rocks PConglomerate Eocene Llagas Fm, Rambla Pacifico, Santa Monica Mtns.

Sedimentary Rocks P Breccia Blackhawk Slide Breccia derived from Furnace Marble (Rd. 247, San Bernardino Co.)

Metamorphic Rocks Slate (top) vs. Shale

Metamorphic Rocks Schist

Metamorphic Rocks Gneiss (and Skittles)

Serpentenite North Baker Beach, Presidio

Geologic Structure P Folds P Joints & Fractures P Faults

Geologic Structure results when rocks and sediments are subjected to: P Tension P Compression P Shear PUplift

Folds

Ventura Anticline San Miguelito Anticline in Pico Formation beds near Ventura

Oil Accumulations in Anticlinal Crests

Natural Oil Seeps Ojai Road

Barstow Syncline Folded Miocene shales and sandstones in Rainbow Basin (north of Barstow)

Santa Ana Canyon east of Yorba Linda

Joints & Fractures

P Campo Reservation, San Diego Co.

Folding & Faulting P Anaverde Formation in San Andreas Fault Zone, Highway 14 near Palmdale

Brittle vs. Ductile Failure

Blind Thrust Faults

Northridge Earthquake, Jan. 1994

Reverse & Thrust Faults

Hollywood and Vine

Normal Faults

1872 Owens Valley Earthquake

Strike-Slip Faults Left-Lateral Right-Lateral

Highway Kern Co. Quake 1992 Lander Earthquake Hwy 58 west of Hwy 223

California Geology P Telling the story with Plate Tectonics

California Geology

Plate Boundaries

Convergent Boundaries- magmatic intrusions and volcanism

Convergent Boundaries- Magmatic intrusions and volcanism

Convergent Boundaries- Magmatic intrusions and volcanism

California Geology

PRECAMBRIAN (>570 my bp)

California Geology PRE-CENOZOIC (<570 my bp) Metamorphics

California Geology PALEOZOIC ( my bp) Antler Orogeny (approx. 350 my bp)

California Geology PALEOZOIC ( my bp) Sedimentary Volcanics Metamorphics

California Geology EARLY MESOZOIC ( my bp) Sierran Trench

California Geology EARLY MESOZOIC ( my bp) Sedimentary Volcanics Metamorphics

California Geology MESOZOIC ( my bp) Sedimentary Volcanics Metamorphics Granitics

California Geology MID-LATE MESOZOIC (140 my bp) Franciscan Trench

California Geology LATE MESOZOIC ( my bp) Great Valley Sed.

California Geology LATE MESOZOIC ( my bp) Great Valley Sed. Ultramafics (Serpentenite)

California Geology LATE MESOZOIC ( my bp) Great Valley Sed. Ultramafics (Serpentenite) Franciscan

The San Andreas “Zipper” 23my 14.5my 7.5my 3my California Geology MID-LATE TERTIARY (30-2 my bp)

California Geology CENOZOIC [ (40) 17-my bp-Pres.] Volcanics

California Geology CENOZOIC ( my bp) Marine Sedimentary Sierra Nevada Uplift (3-5 my bp)

California Geology LATE CENOZOIC - RECENT Nonmarine Sedimentary

The San Andreas “Zipper”

Geology of Southern California Complexity is thy middle name