Watershed sediment production is expected to increase in a warmer future with more extreme rain, with cascading effects throughout drainage and sediment-transport networks. This study investigated landscape-scale sediment movement in the eastern San Francisco Bay area, California, USA, during the extreme 2016–2017 wet season that brought major rainfall, landslides, and flooding. Mapping 8,928 lan…
The genetic mechanism of the Lower Triassic Dongping carbonate-hosted Mn deposit in South China remains debated, particularly regarding depositional redox conditions and the role of organic matter in Mn carbonate formation. Here we present an integrated sedimentological and geochemical study based on new drill-core materials from the Lower Triassic Mn-bearing succession of the Shipao Formation in…
The depositional architectures of continuous translation point bars (TPBs) in single meandering channel belts are increasingly being identified with modern seismic data imaging, yet they remain poorly characterized. This study uses 3D seismic and well-logging data to assess the spatial distribution patterns of depositional thickness and sand fraction of continuous TPBs, and discusses the factors …
Bedform A bedform is a morphological feature formed by the interaction between a flow and cohesion less sediment on a bed. Ripples in sand in a flowing stream and sand dunes in deserts are both examples of bedforms, the former resulting from flow in water, the latter by airflow. The patterns of ripples and dunes are products of the action of the flow and the formation of bedforms creates distinct…
Sedimentology is the study of processes which are formation, transportation and deposition of sediments of continents as well the marine environments which forms the sedimentary rocks. Sedimentary processes Sedimentary rock natures varies with difference of the grains origin, size, shape and composition. Grains and pebbles particles may be derived from the erosion of existing rocks or from volcan…
This Keck project is an interdisciplinary investigation of biologically mediated precipitation of dolomite and other carbonate minerals in Deep Springs Lake, CA. Elucidating the mechanisms of modern dolomite precipitation is a fundamental and longstanding problem in sedimentology and Earth history. Students and faculty will develop an integrated suite of field and laboratory data utilizing techni…
