WSP00003

• File Number: 8200.760
• Description: Yampa River General
• State: CO
• Basin: Yampa/White
• Water Division: 6
• Date: 4/1/1969
• Author: CWCB - USDA
• Title: Water and Related Land Resources - Yampa River Basin - Colorado and Wyoming
• Water Supply Pro - Doc Type: Report/Study

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Little Sandstone Creek. Placer gold has been recovered on the Little
Snake River between Dixon and Baggs. In Moffat County the Paleozoic
sedimentary rocks north of the Yampa River contain fissure veins with
small amounts of copper and gold. Some zinc and iron have also been
recovered. Alluvial sands and gravels contain placer deposits in several
areas of Moffat County, particularly north of Lay.

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Uranium mineralization is widespread throughout the basin, occurring
mainly in the Browns Park Formation. The main areas of prospecting have
been the Miller Hill area, Browns Hill area, and Poison Basin area in
Wyoming and the Maybell-Lay-Juniper Springs area in Colorado. Most of
the mineralization is low grade, but production has been substantial.

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Land Resources

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Soil s

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The former systems of soil classification II 21 followed in the United
States placed all soils in six categories.- In descending sequence the
six were: order, suborder, great soil group, family, series, and type.
Great soil groups alone and in defined associations are sometimes used
as map units on general soil maps and that procedure was followed in
this report.

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In January 1965 a new national classification system 21 was adopted for
field use by the Soil Conservation Service and agencies participating in
the National Cooperative Soil Survey. The new system retains six
categories but names and limits are different than those used in the old
system. Great group names of the new system are shown in estimates of
composition for each map unit in table 2, following page 19. Readers
requiring detailed information on characteristics of the groups and an
explanation of terminology should consult recent publications. 21 ~/

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1/ Baldwin, Mark; Kellogg, Charles E.; and Thorp, James
"Soil Classification," USDA yearbook, 978-1101, 1938.

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II Thorp, James T., and Smith, Guy D.
"Higher Categories of Soil Classification; Order, Suborder, and
Great Soil Groups," Soil ScL 67: 117 -126, 1949.

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21 Soil Survey Staff, SCS, USDA
"Soil Classification, a Comprehensive System 7th Approximation,"
1960 and as amended through October 1966.

~/ Aandahl, Andrew R.
"The First Comprehensive Soil Classification System."
Journal of Soil and Water Conservation 20:243-246, 1965.

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