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State Reg. <br /> A-A' , B-B' , and C-C' , are shown in Exhibits 6-4, 6-5, and 6-6. <br /> These cross sections illustrate the simple structural relation- <br /> ships existing in the areas of active mining. <br /> Faults have not been observed during the course of mining. <br /> According to Cater (1955) , faults are generally absent along <br /> the axial portions of synclines in the Salt Anticline Region. <br /> It is possible that faults with small displacements exist in <br /> undisturbed parts of the permit, but their occurrence is not <br /> yet do=mnted. <br /> 2.04.6 (1) (a) D. STRATIGRAPHY. With the exception of unconsolidated <br /> Quaternary deposits, the only exposed formation at the mine <br /> site is the Dakota Sandstone. The general lithologic char- <br /> acteristics of this formation were described in the section <br /> on Regional Geology. This section discusses the site-specific <br /> stratigraphy as derived from drill hole logs and field exami- <br /> naticn of highwalls and road cuts. <br /> Figure 6-2, Generalized Columnar Section of the Dakota Sand- <br /> stone at the Nucla Mine, and Exhibits 6-4, 6-5, and 6-6, <br /> Geologic Cross Sections, show the cmnplex lithologic relation- <br /> ships within the permit area. Figure 6-2 was prepared using <br /> information obtained by a field geologist during the fall of <br /> 1979. Stratigraphic correlation of individual driller's logs <br /> in Exhibits 6-4 through 6-6 proved to be difficult, and at <br /> times, confusing because of the wide variation in driller's <br /> terminology. only the principle stratigraphic units (i.e. <br /> coal seams, sandstones, etc.) were correlated in these cross <br /> sections. <br /> The two coal seams being mined are the #1 or Upper Dakota Coal <br /> Seam, and the #2 or Lower Dakota Coal Seam. These seams lie <br /> within the "middle" Dakota lithologic unit described by Young <br /> 6-13 <br />