Publications

The late Mesozoic Coast Range ophiolite and Great Valley sequence in California were juxtaposed against the Franciscan Complex during a long tectonic history that included imbricate thrust faulting, low‐angle detachment, and high‐angle reverse faulting. Many low‐angle faults previously mapped as thrusts invariably juxtapose younger over older rocks, suggesting a normal sense of offset...

A real-time system for issuing warnings of landslides during major storms is being developed for the San Francisco Bay region, California. The system is based on empirical and theoretical relations between rainfall and landslide initiation, geologic determination of areas susceptible to landslides, real-time monitoring of a regional network of telemetering rain gages, and National...

No abstract available.

No abstract available.

Contemporary in situ tectonic stress indicators along the San Andreas fault system in central California show northeast-directed horizontal compression that is nearly perpendicular to the strike of the fault. Such compression explains recent uplift of the Coast Ranges and the numerous active reverse faults and folds that trend nearly parallel to the San Andreas and that are otherwise...

Study of the variations of direction and intensity of the geomagnetic field as recorded by the Miocene lava flows on Steens Mountain, southeastern Oregon, has resulted in a detailed description of total field behavior during a reversal in polarity. In addition to information about the polarity reversal itself, the detailed paleomagnetic record includes several thousand years of...

Studies of depth-related benthic foraminiferal biofacies permit the construction of paleobathymetric maps of the La Honda and San Joaquin basins of central California. These maps support the hypothesis that the La Honda and San Joaquin basins were contiguous during the late Oligocene and early Miocene and subsequently were separated by about 320–330 km of right-lateral displacement on...

Fox and others (1985) have made an important contribution to our understanding of iihe evolution of the Mendocino triple junction and the San Andreas transform. They have summarized a large amount of data on the ages and distribution of volcanic centers along the central California coast; their summary clearly shows that the locus of volcanism migrated northwestward along the coast...

No abstract available.

Rocks of the Eastern Franciscan belt, northern California, are divided into two tectonostratigraphic terranes metamorphosed to the blueschist facies, both with a distinct lithologic association and deformational history. The easternmost terrane, the Pickett Peak terrane of Early Cretaceous isotopic age, consists of crenulated mica schist and gneissic to schistose metagraywacke, with...

Small fault‐bounded slabs of low‐grade (prehnite‐pumpellyite‐bearing) slate, metagraywacke, and greenstone occur between the Coast Range ophiolite and South Fork Mountain Schist for at least 60 km south of the Klamath Mountains, northern California. The metagraywacke slabs differ from typical Franciscan Complex metagraywacke to the west by the absence of blueschist‐facies minerals and...

Tectonostratigraphic terrances in northwest California and southwest Oregon record a complex history of subduction, collision, and transform faulting. During the late Jurassic Nevadan orogeny, the Elder Creek-Snow Camp and western Klamath terranes were imbricated during collision of an island-arc system with the continental margin. Subsequent collisions are recorded in the Pickett Peak...