![Optical and radiocarbon ages of stacked paleosols and dune sands in the Nebraska Sand Hills, USA [An article from: Quaternary Science Reviews]](https://www.ebooknetworking.net/books/B00/0RR/bigB000RR0HZY.jpg)
Optical and radiocarbon ages of stacked paleosols and dune sands in the Nebraska Sand Hills, USA [An article from: Quaternary Science Reviews]
Book Details
PublisherElsevier
ISBN / ASINB000RR0HZY
ISBN-13978B000RR0HZ2
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Description
This digital document is a journal article from Quaternary Science Reviews, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Optical ages for eolian sands from the Nebraska Sand Hills indicate periods of extensive eolian activity at ca 115+/-25, 840+/-70, 2300+/-240, and 3560+/-340a. Activity was also noted at single sampling locations at ca 6180+/-370, 8430+/-510 and 13110+/-800a. Many of these ages are similar to those noted by earlier authors. Optical ages from samples collected within paleosols indicate shorter and possibly less extensive periods of eolian activity at approximately 1220+/-150, 1590+/-110, and possibly 1950+/-150a, during which the paleosol sands accumulated. What was originally interpreted as a single 1.2m thick paleosol is shown by optical dating to consist of three or more welded soils developed within eolian sands with optical ages of ca 3800+/-240, 2740+/-240, 1560+/-110, and possibly 1930+/-140a, each of which match eolian pulses recognized elsewhere. Scatter in some optical ages is attributable to intersection of sand-filled rodent burrows extending in outcrop 1.5m below the contact between paleosol and overlying topset beds. A 5310+/-360a optical age for one probable intersected burrow provides evidence for upward or lateral transport of older sands.
Description:
Optical ages for eolian sands from the Nebraska Sand Hills indicate periods of extensive eolian activity at ca 115+/-25, 840+/-70, 2300+/-240, and 3560+/-340a. Activity was also noted at single sampling locations at ca 6180+/-370, 8430+/-510 and 13110+/-800a. Many of these ages are similar to those noted by earlier authors. Optical ages from samples collected within paleosols indicate shorter and possibly less extensive periods of eolian activity at approximately 1220+/-150, 1590+/-110, and possibly 1950+/-150a, during which the paleosol sands accumulated. What was originally interpreted as a single 1.2m thick paleosol is shown by optical dating to consist of three or more welded soils developed within eolian sands with optical ages of ca 3800+/-240, 2740+/-240, 1560+/-110, and possibly 1930+/-140a, each of which match eolian pulses recognized elsewhere. Scatter in some optical ages is attributable to intersection of sand-filled rodent burrows extending in outcrop 1.5m below the contact between paleosol and overlying topset beds. A 5310+/-360a optical age for one probable intersected burrow provides evidence for upward or lateral transport of older sands.
