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Geologic map of the McClure Spring syncline, central Pancake Range, Nye County, Nevada [MAP AND TEXT]
Geol McClure Spring syncline

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Title: Geologic map of the McClure Spring syncline, central Pancake Range, Nye County, Nevada

Author: Russell V. Di Fiori and Sean P. Long
Year: 2022
Series: Open-File Report 2022-03
Format: map: 29.5 x 29 inches, color, two cross sections; text: 9 pages (one page in color)
Scale: 1:24,000

Documenting the style, geometry, and timing of contractional deformation is critical to understanding how orogenic systems evolve. In the Jurassic-Paleogene Cordilleran orogenic belt, many questions remain regarding the timing and geometry of crustal shortening, particularly within the hinterland region of the Sevier fold-thrust belt in Nevada, where Cenozoic extension has complexly overprinted Cordilleran contractional deformation (e.g., Gans and Miller, 1983; Taylor et al., 1993; 2000; Colgan and Henry, 2009; Long, 2012, 2015, 2019). In particular, the geometry and timing of deformation in the central Nevada thrust belt (CNTB), a system of east-vergent thrust faults and folds that branches northward off of the Sevier thrust belt in southern Nevada (fig. 1), have yet to be resolved along much of the along-strike length of this province (e.g., Bartley and Gleason, 1990; Vandervoort and Schmitt, 1990; Taylor et al., 1993, 2000; Long, 2012, 2015; Long et al., 2014). Near Eureka, Nevada (fig. 1), deformation in the CNTB has been interpreted to be coeval with deposition and folding of the Early Cretaceous Newark Canyon Formation, a sparsely preserved fluvio-lacustrine rock unit (Long et al., 2014; Di Fiori et al., 2020). However, south of Eureka, the timing of motion of the CNTB structures can, in most places, only be bracketed between the Pennsylvanian and Oligocene (Taylor et al., 2000).

The central Pancake Range, located ~50 km southeast of Eureka, lies near the eastern limit of the CNTB (fig. 1). 1:250,000-scale reconnaissance geologic mapping in this range by Kleinhampl and Ziony (1985) revealed the presence of a broad-scale (~10 km minimum north-south length, ~3 km minimum east-west width), N-trending, overturned fold: the McClure Spring syncline. An aerially restricted exposure, the Cretaceous Newark Canyon Formation has been mapped within its hinge zone; however, there is disagreement over whether the Newark Canyon Formation is folded or whether it overlaps the fold (Perry and Dixon, 1993). The existing 1:250,000-scale mapping does not permit evaluation of this important field relationship, which warrants investigation at a more detailed scale. To address this issue, we performed 1:24,000-scale geologic mapping of the full extent of exposed Paleozoic bedrock that defines the McClure Spring syncline (fig. 1). Our map encompasses a north-south extent of ~16 km and an east-west extent of ~5.5 km.

This map covers portions of these two 1:24,000-scale quadrangles: Brown Summit and Sand Spring.

This geologic map was funded in part by the USGS National Cooperative Geologic Mapping Program under STATEMAP award number G20AC00390, 2020.

Suggested Citation:
Di Fiori, R.V., and Long, S.P., 2022, Geologic map of the McClure Spring syncline, central Pancake Range, Nye County, Nevada: Nevada Bureau of Mines and Geology Open-File Report 2022-03, scale 1:24,000, 9 p.

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