Jennifer Harden, PhD (Former Employee)
Science and Products
Filter Total Items: 134
Soil formation on the Trail Canyon alluvial fan, Fish Lake Valley, Nevada
No abstract available.
Authors
J. W. Harden, J. L. Slate, P. J. Lamothe, O.A. Chadwick, E. G. Pendall, A.R. Gillespie
Calcic, gypsic, and siliceous soil chronosequences in arid and semiarid environments
We studied three soil chronosequences in the western USA to compare the development of calcic, gypsic, and siliceous soils through time. We compared calcic soils from the Silver Lake playa, southeastern California, gypsic-calcic soils from the Kane Fans in Big Horn County, Wyoming, and siliceous-calcic soils from Forty-mile Wash in southwestern Nevada. In these areas, carbonate, gypsum, and opalin
Authors
J. W. Harden, E. M. Taylor, M. C. Reheis, L. D. McFadden
Rates of soil development from four soil chronosequences in the southern Great Basin
Four soil chronosequences in the southern Great Basin were examined in order to study and quantify soil development during the Quaternary. Soils of all four areas are developed in gravelly alluvial fans in semiarid climates with 8 to 40 cm mean annual precipitation. Lithologies of alluvium are granite-gneiss at Silver Lake, granite and basalt at Cima Volcanic Field, limestone at Kyle Canyon, and s
Authors
J. W. Harden, E. M. Taylor, C. Hill, R. K. Mark, L. D. McFadden, M. C. Reheis, J.M. Sowers, S. G. Wells
Pedogenic isotopic indicators of climate and carbon cycling in Fish Lake valley, Nevada
No abstract available.
Authors
E. G. Pendall, J. W. Harden, S.E. Trumbore
Soil development on stable landforms and implications for landscape studies
Soil development parameters include a wide variety of morphological, chemical, and mineralogical parameters, but some of the best indicators of time and surface stability are derived from field morphology. Over long time-spans, the most common time function for soil development is exponential or logarithmic, in which rates decrease with increasing age. Over shorter time-spans in semi-arid and mois
Authors
J. W. Harden
Development rates of Late Quaternary soils, Silver Lake Playa, California
Soils formed on alluvial fan deposits that range in age from about 35 000 to 200 yr BP near Silver Lake playa in the Mojave Desert permit study of the rates of soil development in an arid, hyperthermic climate. Field-described properties of soils were quantified and analyzed using a soil development index that combines properties and horizon thicknesses. Pedogenic CaCO3 (as indicated by color), pH
Authors
M. C. Reheis, J. W. Harden, L. D. McFadden, R. R. Shroba
Genetic interpretations of elemental and chemical differences in a soil chronosequence, California
Soils developed on fluvial terraces in central California have similar parent materials, climatic settings, vegetation cover and slopes but range in age from 40,000 to 3,000,000 years. The soils have chemical compositions that change systematically with increasing age. Such chemical differentiation is most likely the result of long-term weathering and mineralogical transformations that occurred si
Authors
J. W. Harden
A statistical method for estimating rates of soil development and ages of geologic deposits: A design for soil-chronosequence studies
A statistical method for estimating rates of soil development in a given region based on calibration from a series of dated soils is used to estimate ages of soils in the same region that are not dated directly. The method is designed specifically to account for sampling procedures and uncertainties that are inherent in soil studies. Soil variation and measurement error, uncertainties in calibrati
Authors
P. Switzer, J. W. Harden, R. K. Mark
Soils developed in granitic alluvium near Merced, California
No abstract available.
Authors
J. W. Harden
Soils developed on coastal and fluvial terraces near Ventura, California
No abstract available.
Authors
J. W. Harden, Andrei M. Sarna-Wojcicki, Glenn R. Dembroff
A quantitative comparison of Soil Development in four climatic regimes
A new quantitative Soil Development Index based on field data has been applied to chronosequences formed under different climatic regimes. The four soil chronosequences, developed primarily on sandy deposits, have some numeric age control and are located in xeric-inland (Merced, Calif.), xeric-coastal (Ventura, Calif.), aridic (Las Cruces, N. Mex.), and udic (Susquehanna Valley, Pa.) soil-moisture
Authors
J. W. Harden, E. M. Taylor
A quantitative index of soil development from field descriptions: Examples from a chronosequence in central California
A soil development index has been developed in order to quantitatively measure the degree of soil profile development. This index, which combines eight soil field properties with soil thickness, is designed from field descriptions of the Merced River chronosequence in central California. These eight properties are: clay films, texture plus wet consistence, rubification (color hue and chroma), stru
Authors
J. W. Harden
Science and Products
Filter Total Items: 134
Soil formation on the Trail Canyon alluvial fan, Fish Lake Valley, Nevada
No abstract available.
Authors
J. W. Harden, J. L. Slate, P. J. Lamothe, O.A. Chadwick, E. G. Pendall, A.R. Gillespie
Calcic, gypsic, and siliceous soil chronosequences in arid and semiarid environments
We studied three soil chronosequences in the western USA to compare the development of calcic, gypsic, and siliceous soils through time. We compared calcic soils from the Silver Lake playa, southeastern California, gypsic-calcic soils from the Kane Fans in Big Horn County, Wyoming, and siliceous-calcic soils from Forty-mile Wash in southwestern Nevada. In these areas, carbonate, gypsum, and opalin
Authors
J. W. Harden, E. M. Taylor, M. C. Reheis, L. D. McFadden
Rates of soil development from four soil chronosequences in the southern Great Basin
Four soil chronosequences in the southern Great Basin were examined in order to study and quantify soil development during the Quaternary. Soils of all four areas are developed in gravelly alluvial fans in semiarid climates with 8 to 40 cm mean annual precipitation. Lithologies of alluvium are granite-gneiss at Silver Lake, granite and basalt at Cima Volcanic Field, limestone at Kyle Canyon, and s
Authors
J. W. Harden, E. M. Taylor, C. Hill, R. K. Mark, L. D. McFadden, M. C. Reheis, J.M. Sowers, S. G. Wells
Pedogenic isotopic indicators of climate and carbon cycling in Fish Lake valley, Nevada
No abstract available.
Authors
E. G. Pendall, J. W. Harden, S.E. Trumbore
Soil development on stable landforms and implications for landscape studies
Soil development parameters include a wide variety of morphological, chemical, and mineralogical parameters, but some of the best indicators of time and surface stability are derived from field morphology. Over long time-spans, the most common time function for soil development is exponential or logarithmic, in which rates decrease with increasing age. Over shorter time-spans in semi-arid and mois
Authors
J. W. Harden
Development rates of Late Quaternary soils, Silver Lake Playa, California
Soils formed on alluvial fan deposits that range in age from about 35 000 to 200 yr BP near Silver Lake playa in the Mojave Desert permit study of the rates of soil development in an arid, hyperthermic climate. Field-described properties of soils were quantified and analyzed using a soil development index that combines properties and horizon thicknesses. Pedogenic CaCO3 (as indicated by color), pH
Authors
M. C. Reheis, J. W. Harden, L. D. McFadden, R. R. Shroba
Genetic interpretations of elemental and chemical differences in a soil chronosequence, California
Soils developed on fluvial terraces in central California have similar parent materials, climatic settings, vegetation cover and slopes but range in age from 40,000 to 3,000,000 years. The soils have chemical compositions that change systematically with increasing age. Such chemical differentiation is most likely the result of long-term weathering and mineralogical transformations that occurred si
Authors
J. W. Harden
A statistical method for estimating rates of soil development and ages of geologic deposits: A design for soil-chronosequence studies
A statistical method for estimating rates of soil development in a given region based on calibration from a series of dated soils is used to estimate ages of soils in the same region that are not dated directly. The method is designed specifically to account for sampling procedures and uncertainties that are inherent in soil studies. Soil variation and measurement error, uncertainties in calibrati
Authors
P. Switzer, J. W. Harden, R. K. Mark
Soils developed in granitic alluvium near Merced, California
No abstract available.
Authors
J. W. Harden
Soils developed on coastal and fluvial terraces near Ventura, California
No abstract available.
Authors
J. W. Harden, Andrei M. Sarna-Wojcicki, Glenn R. Dembroff
A quantitative comparison of Soil Development in four climatic regimes
A new quantitative Soil Development Index based on field data has been applied to chronosequences formed under different climatic regimes. The four soil chronosequences, developed primarily on sandy deposits, have some numeric age control and are located in xeric-inland (Merced, Calif.), xeric-coastal (Ventura, Calif.), aridic (Las Cruces, N. Mex.), and udic (Susquehanna Valley, Pa.) soil-moisture
Authors
J. W. Harden, E. M. Taylor
A quantitative index of soil development from field descriptions: Examples from a chronosequence in central California
A soil development index has been developed in order to quantitatively measure the degree of soil profile development. This index, which combines eight soil field properties with soil thickness, is designed from field descriptions of the Merced River chronosequence in central California. These eight properties are: clay films, texture plus wet consistence, rubification (color hue and chroma), stru
Authors
J. W. Harden
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government