Red and gray clay underlying ore-bearing sandstone of the Morrison Formation in western Colorado
A preliminary study of the clays underlying the ore-bearing sandstone of the Morrison formation, Colorado, has tentatively identified the chief clay mineral as hydrous mica. Complete and partial chemical analyses show that the red clay contains more total iron and ferric iron than the gray clay. Spe...
| Main Authors: | Weeks, Alice D., Geological Survey (U.S.) |
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| Format: | Text |
| Language: | English eng |
| Published: |
1951
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| Subjects: | |
| Online Access: |
http://hdl.handle.net/11166/83687 http://archives.mountainscholar.org/cdm/ref/collection/p17393coll30/id/4068 |
| Summary: |
A preliminary study of the clays underlying the ore-bearing sandstone of the Morrison formation, Colorado, has tentatively identified the chief clay mineral as hydrous mica. Complete and partial chemical analyses show that the red clay contains more total iron and ferric iron than the gray clay. Spectrographic analyses of minor constituents show no significant difference between the red and gray except in iron content. Quartz and carbonate have a wide range in quantity that is not related to the color of the clay. Insufficient evidence is available from these specimens to indicate whether the gray altered from the red clay. |
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