Sedimentary Features and Mineralization fo the Salt Wash Sandstone at Cove Mesa, Carrizo Mountains, Apache County, Arizona: Technical Report for April 1, 1953 to March 31, 1954 Page: 11
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11
The presence of crosstrends is suggested by the
"cloverleaf" pattern of the contour lines in several areas.
An example of this is shown on the accompanying map, figure
4, in the vicinity of 48,000 N. and 202,000 E. Another
example of this crosstrend is shown in the vicinity of 0-5
in the southern portion of the mesa and again at the ex-
treme southern tip of the mesa, where two superjacent
channels are indicated.
SIGNIFICANCE OF THE SAND-SHALE RATIOS
Many correlations have been made between the pattern
of distribution of maximum sandstone-shale ratios and other
significant features of the Salt Wash sandstone at Cove
Mesa. The following significant comparisons may be made
on the basis of the present study and previously obtained
information:
1. Correlation ythete Physiography of the mesa.
It has previously been suggested by Stokes Toral communi-
cation) that the remnant shapes of many of the mesa-like
exposures of the Salt Wash sandstone in the Colorado Pla-.
teau are determined largely by the lateral distribution
of thick massive sandstones in the area. This correlation
may be seen on the map (fig. 4). Note the northeast trend
of the sandstone axis at the north edge of the mesa. Im-
mediately east of this high sandstone area there is a re-
entrant corresponding to the low sandstone-shale ratios
indicated on the map. The broad promontory on the north-
west edge of the mesa is obviously supported by the south-
east and east-trending axes of high sandstone-shale ratios
in the area from A-2 to C-2. The narrow constriction of
the southern one-fourth of the mesa corresponds to an area
of low sandstone-shale ratios while the northeast trend
of the southern margin is controlled by a northeast-trend-
ing maximum in that vicinity.
2. r tion wih sedimentary trends. Figure 5
shows a somewhat simplified version of the sandstone-shale
ratio map of figure 4. Alternating iso-ratio lines have
been omitted in order to effectively superimpose the direc-
tions of sedimentary trends determined by Stokes (1953).
The trends indicated by heavy arrows indicate the direction
of flow of Salt Wash streams as indicated by fluvial cross-
bedding, lineation in the sandstones, rib-and-furrow struc-
tures, and ripple marks (Stokes, 1953). The pronounced
curves in the Salt Wash paleodrainage previously inferred
by Stokes (1953) are confirmed within the mesa by the curv-
ing axes of high sandstone-shale ratios. For example, the
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Jones, Daniel J. Sedimentary Features and Mineralization fo the Salt Wash Sandstone at Cove Mesa, Carrizo Mountains, Apache County, Arizona: Technical Report for April 1, 1953 to March 31, 1954, report, March 1954; Washington, D.C.. (https://digital.library.unt.edu/ark:/67531/metadc783663/m1/11/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.