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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Antelope Valley (1)
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Asia
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Far East
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Japan
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Honshu
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Niigata Japan (1)
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Canada
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California
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elements, isotopes
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hydrogen
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isotopes
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stable isotopes
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deuterium (1)
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metals
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gold (1)
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rare earths (1)
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oxygen
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O-18/O-16 (1)
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fossils
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Invertebrata
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Protista
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microfossils (2)
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thallophytes (1)
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geochronology methods
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geologic age
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Primary terms
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Asia
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Far East
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Japan
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Honshu
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Canada
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carbon
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organic carbon (1)
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Tertiary
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volcanic rocks
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basalts
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tholeiitic basalt (1)
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Invertebrata
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Mollusca
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Bivalvia
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Glycymeris (1)
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Cephalopoda
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Ammonoidea (1)
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Protista
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Foraminifera (1)
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isotopes
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stable isotopes
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D/H (1)
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deuterium (1)
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O-18/O-16 (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous (3)
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Franciscan Complex (2)
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Great Valley Sequence (6)
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Jurassic
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Coast Range Ophiolite (1)
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Upper Jurassic
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Portlandian (1)
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Tithonian (1)
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metal ores
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gold ores (2)
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metals
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gold (1)
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rare earths (1)
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metamorphic rocks
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amphibolites (1)
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metaigneous rocks
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metabasalt (1)
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serpentinite (2)
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metasomatic rocks
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serpentinite (2)
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schists
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blueschist (1)
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metasomatism (1)
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Mexico
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Baja California Mexico (1)
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mineral deposits, genesis (2)
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oil and gas fields (2)
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oxygen
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O-18/O-16 (1)
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Pacific Ocean
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paleogeography (3)
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Plantae
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plate tectonics (4)
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sandstone (3)
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shale (1)
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sedimentary structures
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soft sediment deformation
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olistostromes (2)
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sedimentation (6)
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sediments
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clastic sediments
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clay (2)
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sand (1)
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silt (1)
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seismology (3)
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springs (1)
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thallophytes (1)
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United States
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California
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Central California (3)
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Humboldt County California (2)
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Kern County California (1)
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Lake County California (2)
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Los Angeles Basin (1)
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Mendocino County California (1)
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Napa County California (19)
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Northern California (8)
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San Francisco Bay (2)
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San Francisco Bay region (1)
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The Geysers (1)
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Delaware (1)
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waste disposal (1)
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weathering (1)
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well-logging (1)
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sedimentary rocks
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sedimentary rocks
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clastic rocks
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conglomerate (1)
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sandstone (3)
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shale (1)
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-
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sedimentary structures
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sedimentary structures
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soft sediment deformation
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olistostromes (2)
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-
-
-
sediments
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sediments
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clastic sediments
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clay (2)
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sand (1)
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silt (1)
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-
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soils
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soils
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Luvisols (1)
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Site Response in the Walnut Creek–Concord Region of San Francisco Bay, California: Ground‐Motion Amplification in a Fault‐Bounded Basin
Nanoscale Distribution of Elements in Gold: Examples from Contrasting Deposit Types
1. ABSTRACT The geology of the northern Sierra Nevada of California records >400 million years of active plate margin tectonic events as a part of the North American Cordilleran orogenic belt. This field-trip guide provides geologic background and description of field-trip stops for a two-day field trip of the 2023 Geological Society of America Cordilleran Section Meeting based in Reno, Nevada. In two days, we cannot sample the complete geologic record of the northern Sierra Nevada, so this guide does not provide an exhaustive review of this geology. We will focus on certain aspects of the geology that have been the subject of recent research and present some previously unpublished observations and interpretations including: (1) distinguishing between subduction complexes and deformed assemblages that overlay subduction zones; (2) evidence for subduction initiation, recorded in high-pressure ( P ), high-temperature ( T ) amphibolites and possibly greenschist facies rocks structurally beneath them; (3) finding of high- P , high- T amphibolite blocks in mélange zones in subduction complex units accreted structurally beneath intact high- P , high- T amphibolite horizons; (4) differences in stream profiles between southern Cascade and northern Sierra drainages, suggesting different forcing mechanisms for stream erosion in those regions; and (5) complex relationships between stream incision, volcanic deposition, and Late Cenozoic faulting. • DEDICATION • This field–trip guide is dedicated to Eldridge Moores (1938–2018) and Jason Saleeby (1948–2023) who were giants in Sierra Nevada geologic research. Eldridge passed away in October 2018 while leading a field trip in this area on which the leaders of the current field trip (JW, DS) were participants. Jason passed away during the writing of this guide. As will be clear from reading this guide, the saying “standing on the shoulders of giants” applies.