Ontogeny of a flood plain

Article Abstract:

The evolution of five flood plains on the Powder River in southeast Montana after the major flood in 1978 was studied and determined. The flood plain growth developed on elevated gravel and sand deposited by the flood in 1978. The sedimentation similar to a bench was layered and suggested frequent erosion. Further growth of the flood plain was significantly aided by the subsequent growth of vegetation in the area. Results also showed that the formation of flood plains on winding rivers could occur by vertical accretion along the boundaries of an expanded channel.

Environmental aspects, Rivers, Floodplains, Powder River Basin

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Reply

Article Abstract:

A response to M. Curtis' comment on a paper entitled 'Evidence for Cambrian deformation in the Ellsworth-Whitmore Mountains terrane, Antarctica: stratigraphic and tectonic implications' is presented. Curtis argues 'that there is no evidence for Cambrian contractional deformation.' However, the evidence of angular unconformity in the Webers Peaks location, the cleaved slate clasts within the basal Crashite, and the data on D1 deformation in the Heritage Group indicate the existence of a tectonic setting in the region during the Cambrian.

Geology, Stratigraphic, Stratigraphy, Cambrian period, Antarctic regions

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Kinematics and timing of tertiary extension in the western Lake Mead region, Nevada: discussion and reply

Article Abstract:

A study on the origin and kinematics of extensional tectonic structures in the western Lake Mead region was analyzed using previous studies on the Las Vegas, NV, shear zone. The study was criticized for misrepresenting previous models, using a kinematic method that cannot be applied to the region, providing a viscous model that contradicts with field observations and failing to consider the age relations of the structures studied. A reply to the criticisms by the study's authors is also presented.

Las Vegas, Nevada, Lake Mead

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