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Eolian Landscape History and Prehist...

Schott, Amy Michelle.

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Eolian Landscape History and Prehistoric Dune Farming in Petrified Forest National Park: A Geoarchaeological Approach to Understanding the Long-term Use of a Marginal Landscape.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Eolian Landscape History and Prehistoric Dune Farming in Petrified Forest National Park: A Geoarchaeological Approach to Understanding the Long-term Use of a Marginal Landscape./
Author:	Schott, Amy Michelle.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	210 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
Contained By:	Dissertations Abstracts International81-02B.
Subject:	Archaeology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=22619057
ISBN:	9781085759540

Eolian Landscape History and Prehistoric Dune Farming in Petrified Forest National Park: A Geoarchaeological Approach to Understanding the Long-term Use of a Marginal Landscape.
Schott, Amy Michelle.

Eolian Landscape History and Prehistoric Dune Farming in Petrified Forest National Park: A Geoarchaeological Approach to Understanding the Long-term Use of a Marginal Landscape. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 210 p.

Source: Dissertations Abstracts International, Volume: 81-02, Section: B.

Thesis (Ph.D.)--The University of Arizona, 2019.

This item must not be sold to any third party vendors.

This study uses geoarchaeological analyses of sediments, soils, and geomorphology to understand human-environment interaction in the eolian landscape in Petrified Forest National Park, Northeast Arizona. The Petrified Forest National Park is located along the southern end of an extensive sand sheet. This landscape was inhabited by Ancestral Pueblo people from at least A.D. 200-1400, and contains evidence of widespread dune farming agriculture. Soil geomorphic analysis and optically stimulated luminescence dating document discrete periods of eolian activity in the study area. The oldest eolian activity dates to ca. 16,000-11,000 B.C., and is expressed as stable dunes on upland landscape positions. Extensive remobilization and deposition of eolian sediments occurred in at least three periods in the late Holocene, at ca. 300 B.C., from A.D. 300-500, and ca. A.D. 1100, followed by additional deposition after A.D. 1200. The sequence of deposition of eolian sediments is similar across nearby regions on the Colorado Plateau, suggesting a climatic control on deposition. Soil physical and chemical analyses indicate that soil nutrients across the study area are generally low, making farming possible but not highly productive. Water retention in dunes is improved by stratification of sand over clay deposits, and by high amounts of clay within sand dunes. Micromorphological and clay mineralogical studies show that clay within the dunes is distributed as aggregates, likely incorporated into the dunes from locally eroded Triassic clay deposits. The prehispanic landscape surface includes soils that demonstrate some landscape stability, even though eolian deposition was ongoing during use of the landscape for agriculture. Although we have limited archaeological remains of field systems, this research supports the hypothesis that the region was used for dry farming by prehispanic people. Archaeological sites that likely reflect agricultural use of the eolian landscape are preferentially located in areas with soils with higher amounts of clay, which would have improved water holding capacity. High variation in soils and sediments at the site-scale relates to geomorphic position, and suggests that prehispanic farmers may have carefully selected field locations to take advantage of micro-environments with better hydrological characteristics, such as contrasting soil textures. Prehispanic farmers may have used similar farming techniques to those of modern Indigenous groups to improve conditions in order to cultivate sandy eolian soils. Soil quality is relatively poor, but the improved water holding capacity of the sandy soils due to the local geologic environment may have made this area more attractive for dune farming, and may be one reason this landscape was inhabited for such a long time.

ISBN: 9781085759540Subjects--Topical Terms:

558412
Archaeology.

Eolian Landscape History and Prehistoric Dune Farming in Petrified Forest National Park: A Geoarchaeological Approach to Understanding the Long-term Use of a Marginal Landscape.
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520 $a This study uses geoarchaeological analyses of sediments, soils, and geomorphology to understand human-environment interaction in the eolian landscape in Petrified Forest National Park, Northeast Arizona. The Petrified Forest National Park is located along the southern end of an extensive sand sheet. This landscape was inhabited by Ancestral Pueblo people from at least A.D. 200-1400, and contains evidence of widespread dune farming agriculture. Soil geomorphic analysis and optically stimulated luminescence dating document discrete periods of eolian activity in the study area. The oldest eolian activity dates to ca. 16,000-11,000 B.C., and is expressed as stable dunes on upland landscape positions. Extensive remobilization and deposition of eolian sediments occurred in at least three periods in the late Holocene, at ca. 300 B.C., from A.D. 300-500, and ca. A.D. 1100, followed by additional deposition after A.D. 1200. The sequence of deposition of eolian sediments is similar across nearby regions on the Colorado Plateau, suggesting a climatic control on deposition. Soil physical and chemical analyses indicate that soil nutrients across the study area are generally low, making farming possible but not highly productive. Water retention in dunes is improved by stratification of sand over clay deposits, and by high amounts of clay within sand dunes. Micromorphological and clay mineralogical studies show that clay within the dunes is distributed as aggregates, likely incorporated into the dunes from locally eroded Triassic clay deposits. The prehispanic landscape surface includes soils that demonstrate some landscape stability, even though eolian deposition was ongoing during use of the landscape for agriculture. Although we have limited archaeological remains of field systems, this research supports the hypothesis that the region was used for dry farming by prehispanic people. Archaeological sites that likely reflect agricultural use of the eolian landscape are preferentially located in areas with soils with higher amounts of clay, which would have improved water holding capacity. High variation in soils and sediments at the site-scale relates to geomorphic position, and suggests that prehispanic farmers may have carefully selected field locations to take advantage of micro-environments with better hydrological characteristics, such as contrasting soil textures. Prehispanic farmers may have used similar farming techniques to those of modern Indigenous groups to improve conditions in order to cultivate sandy eolian soils. Soil quality is relatively poor, but the improved water holding capacity of the sandy soils due to the local geologic environment may have made this area more attractive for dune farming, and may be one reason this landscape was inhabited for such a long time.
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