Award Date

1-1-1989

Degree Type

Thesis

Degree Name

Master of Science (MS)

First Committee Member

Frederick W. Bachhuber

Number of Pages

112

Abstract

Late-middle to late Holocene dune sediment that overlies Pleistocene lacustrine sediment marks the onset of xeric conditions in the Estancia Valley, central New Mexico. Incised into the underlying lacustrine sediments, the modern deflation basins are enclosed by parabolic dunes composed of clay and gypsum derived from the underlying sediment; Located on the in-facing duneslopes of the deflation basins, the most striking geomorphic feature of this dune complex are numerous elongated scars. These relict scars document a geomorphically distinct earthflow event. Arroyos that cut into flow scars expose eolian earthflow sediment overlying lacustrine deposits. In the zone of depletion, erosional-flow evidence reveals flamed-load structures, channels, and rip-up clasts of lacustrine sediments. In the zone of accumulation, depositional flow evidence reveals laminations and lithic-rich horizons derived from the underlying lacustrine section; The large number of geomorphically similar earthflow scars are believed to represent a mesic climatic fluctuation within the late Holocene of the Estancia Valley.

Keywords

Climate change; Climatic; Complex; Dune; Earthflows; Estancia Valley; Geomorphic; Holocene; Late Holocene; Willard; New Mexico

Controlled Subject

Geology; Hydrology; Physical geography

File Format

pdf

File Size

6.32 MB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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