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- W409954158 abstract "The Great Blue Limestone was named originally by Spurr (1895) from exposures near the Mercur mining district in the Oquirrh Mountains, Utah. The formation was described in greater detail by Gilluly (1932) in the Ophir mining district. Neither formally established a type locality for this formation in the Oquirrh Mountains. However, the formation has since been correlated broadly with similar sedimentary rocks elsewhere in the adjoining Rocky Mountains and Great Basin regions. For the record, and to assist future correlations, a type measured section of the Great Blue Limestone in the Oquirrh Mountains is located, described, and a detailed measured section is included in the appendix. The Great Blue Limestone consists of three members. The Silveropolis limestone member of Tooker and Gordon (1978), which is the unnamed lower limestone of Gilluly (1932). It is a 260 mthick stratigraphic section composed of dark-gray, medium-bedded limestone, intercalated with sandstone and argillaceous limestone. This is overlain by the Long Trail Shale, whose type locality Gilluly (1932) specified at the head of Long Trail Gulch in the Ophir mining district. It is 33 m thick and composed of carbonaceous gray shale and interbedded fossiliferous medium-gray limestone. The Mercur limestone member of Tooker and Gordon (1978), which is Gilluly's (1932) unnamed upper limestone, is 471 m thick and composed of alternating dark-gray fossiliferous, sandy, and cherty limestones separated by interbedded shale and shaly limestone intervals. The type locality of the Great Blue Limestone is on the easttrending ridge 1.8 km south of Ophir (Mercur 7.5-minute 1 Mr. Gordon died before a final draft of this report was completed. quadrangle), along a broken line between Silveropolis Hill, the head of Long Trail Gulch, to Hill 8790, and in an offset, 0.6 km to the southeast, eastward to the South Fork of Ophir Canyon. The formation is 765 m thick, rests conformably on the Humbug Formation, and is overlain conformably by the Manning Canyon Shale. The age of the Great Blue Limestone is Late Mississippian. The upper part of the FABEROPHYLLUM Coral Zone, (latest Meramecian), occupies the lower 34 m of the lower member. Above this, the formation is Chesterian in age. The CANINIA Coral Zone is recorded from 197 m to 322 m above the base of the Mercur limestone. The only coral between the two zones is AMPLEXIZAPHRENTES. SPIRIFER BRAZERIANUS Girty appears in the Long Trail Shale and continues upward to at least the top of the CANINIA Zone. Measurement of the Great Blue Limestone type section permits more systematic comparisons of the stratigraphy of its agecorrelative rocks in the region. The thrust-fault terranes resulting from the Sevier Orogeny (Armstrong, 1968) contain differences in lithologies that represent their deposition in distinct, commonly widely separated hinterland sites (Tooker, 1983). Examples of these differences, which can be seen in foreland thrust nappes now located in the northern Oquirrh, Tintic, Wasatch, Stansbury and Promontory Mountains, underscore the magnitude of regional variations in Great Blue Limestone-age lithologies." @default.
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- W409954158 date "2000-01-01" @default.
- W409954158 modified "2023-09-27" @default.
- W409954158 title "Type locality for the Great Blue Limestone in the Bingham Nappe, Oquirrh Mountains, Utah" @default.
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- W409954158 doi "https://doi.org/10.3133/ofr0012" @default.
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