My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
WSP04845
CWCB
>
Water Supply Protection
>
Backfile
>
4001-5000
>
WSP04845
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/26/2010 2:15:53 PM
Creation date
10/12/2006 12:41:25 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8271.300
Description
Colorado River Basin Salinity Control Program - General Information and Publications-Reports
Basin
Colorado Mainstem
Water Division
5
Date
4/1/1982
Author
R Johnson S Schumm
Title
Geomorphic and Lithologic Controls of Diffuse-Source Salinity -- Grand Valley - Western Colorado
Water Supply Pro - Doc Type
Report/Study
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
108
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />40 <br /> <br />and bank failure. In relative terms, badlands underlain by inter- <br /> <br />...... <br />c.u <br />CD <br />jl-" <br /> <br />bedded shale and sandstone bedrock are more stable than those <br /> <br />underlain by shale bedrock. The former are less erodible because <br /> <br />they have a more permeable soil layer which gives rise to deeper <br /> <br />soils and greater, though minimal, vegetative cover than the latter. <br /> <br />5.3 Pediments <br /> <br />5.3.1 Introduction <br /> <br />The area has many generally smooth, sloping, gravel- <br /> <br />capped landforms perched above the badland terrain. These features <br /> <br />are common along other portions of the Book Cliffs as well as in <br /> <br />other areas where Mancos Shale crops out below resistant cliffs. These <br /> <br />landforms are referred to as pediments. <br /> <br />By definition, a pediment is a gently inclined planate erosion <br /> <br />surface carved in bedrock and generally veneered with fluvial gravels <br /> <br />(American Geological Institute, 1976). Many theories have been <br /> <br />developed to describe the origin of pediments, but none apply to the <br /> <br />pediments in Grand Valley. For example, there is no evidence of <br /> <br />lateral swinging of streams issuing from mountains, as Gilbert noted <br /> <br />(1877). Rich's (1935) conclusion that weathering and sheetwash are <br /> <br />the principal pediment-forming agents does not apply. The theory <br /> <br />offered by Rich (1935), Hunt, et al. (1953), Godfrey (1968), and <br /> <br />Carter (1980) that stream capture caused the multiple surface levels <br /> <br />does not pertain to Grand Valley, either. Sinnock's (1981) observa- <br /> <br />tions are more applicable than other theories, with the notable excep- <br /> <br />tion that Grand Valley pediments are not capped by glacial outwash <br /> <br />and mudflows. <br />
The URL can be used to link to this page
Your browser does not support the video tag.