The Inskip Formation, the Harmony Formation, and the Havallah sequence of Northwestern Nevada — An interrelated Paleozoic assemblage in the home of the Sonoma orogeny

Ketner, Keith B.

doi:10.3133/pp1757

Cited by 7 publications

(16 citation statements)

References 18 publications

(32 reference statements)

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“…No Early Cretaceous faults or other deformation have been described from this region, but this topic warrants further study. In particular, we note that the East and Sonoma Ranges have an unusually complex Meso zoic (post-Luning-Fencemaker belt) faulting history compared to other ranges in northwest Nevada, and that this faulting history is poorly understood and poorly dated (e.g., Ferguson et al, 1959Ferguson et al, , 1976Gilluly, 1967;Silber man and McKee, 1971;Silberling, 1975;Elison, 1987;Stahl, 1987;Speed et al, 1988;Elison et al, 1990;Whitebread, 1994;Ketner, 1998Ketner, , 2008Dunston, 2002). These faults in part defi ne the Winnemucca deformation belt of Speed et al (1988;Fig.…”

Section: Implications For Mid-mesozoic Paleogeography and Crustal Arcmentioning

confidence: 92%

The Lower Cretaceous King Lear Formation, northwest Nevada: Implications for Mesozoic orogenesis in the western U.S. Cordillera

Martin

Wyld

Wright

et al. 2009

Geological Society of America Bulletin

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Cretaceous paleogeography of the U.S. Cordillera west of the Sevier fold-and-thrust belt is poorly known due to the scarcity of Cretaceous supracrustal rocks in the arc and backarc regions. The Lower Cretaceous King Lear Formation, exposed in the Jackson Mountains and the Krum Hills of northwest Nevada, provides a rare and important record of Early Cretaceous tectonism and paleogeography. Our work shows that the King Lear Formation everywhere overlies deformed and metamorphosed Triassic-Jurassic rocks across a major unconformity. The King Lear Formation is dominated by conglomerates and sandstones deposited in subaerial alluvial-fan and gravelly braided river systems, and it can be divided into three new members based on differences in clast provenance: a lower member derived from local arc and backarc rocks; a middle member dominated by externally derived quartzite and chert clasts; and an upper member derived largely from an intrabasinal volcanic complex. Sedimentary features and provenance analysis indicate that clasts in the middle member were derived from nearby exposures of Paleozoic rocks such as the Roberts Mountains and Golconda allochthons, which must have formed a topographically elevated area in central Nevada during the Early Cretaceous. The stratigraphic record provides evidence of deposition in a tectonically active basin. In contrast with some prior studies inferring that deposition was synchronous with contractional deformation, our new fi eld observations, structural data, and a shallow seismic-refl ection profi le confi rm that the King Lear Formation was deposited in an active half-graben in the Jackson Mountains. These results provide new upper age constraints on the timing of shortening deformation in the arc and backarc regions: shortening must have been complete not only before deposition of the King Lear Formation in the middle Early Cretaceous, but also prior to several kilometers of exhumation of its depositional basement. Possible driving forces for extension leading to development of the King Lear basin include relaxation of thick crust in the hinterland of thrust belts to the east, stresses associated with regional tilting and development of dynamic topography, and stresses related to dextral strikeslip defor ma tion to the west. Downloaded from Figure 3. Generalized geology of the Jackson Mountains portion of the Black Rock arc terrane and the Jungo Hills to Krum Hills portion of the basinal terrane, based on Willden

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Section: Implications For Mid-mesozoic Paleogeography and Crustal Arcmentioning

confidence: 92%

The Lower Cretaceous King Lear Formation, northwest Nevada: Implications for Mesozoic orogenesis in the western U.S. Cordillera

Martin

Wyld

Wright

et al. 2009

Geological Society of America Bulletin

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“…The structure of the lower to middle Paleozoic rocks is extremely complex, due mainly to Pennsylvanian and younger tectonism (Ketner, 1977(Ketner, , 1984(Ketner, , 1998b(Ketner, , 2008(Ketner, , 2012Ketner and Alpha, 1992;Trexler and others, 2004), but most of the stratigraphic components have been partially dated by fossils to the extent that the stratigraphy in many areas can be pieced together with considerable confidence. Moreover, many critical exposures of contacts have been observed and mapped ( fig.…”

Section: Milesmentioning

confidence: 99%

“…Small bodies of basaltic rocks (see appendix, columns 1, 3, 4, 7, and 9) and barite deposits (column 11) form part of the orogenic deposits, as they do in the western facies assemblage. Rhyolitic rocks, in addition to basalt, are present in the orogenic Inskip Formation of the East Range (Ketner, 2008).…”

Section: Nature Of the Orogenic Sedimentsmentioning

confidence: 99%

“…This column is based primarily on mapping by Jones (1997a,b) as interpreted by Ketner and others (2005) and Ketner (2008). In this interpretation, the chert part of the "Cambrian" Paradise Valley Chert of Jones is a regional chert couplet consisting of a lower black chert unit and an upper white chert unit, which sits at the boundary between the Ordovician and Silurian.…”

Section: Column 1 Hot Springs Rangementioning

confidence: 99%

“…As assembled in this column, the sequence in the Osgood Mountains resembles that of the neighboring Hot Springs, Sonoma, and East Ranges. In all three of these ranges, the Valmy Formation is overlain disconformably by a chaotic assemblage of igneous and sedimentary rocks including arkosic sandstone and basaltic rocks (Ketner, 2008), all of which can be found in either the Goughs Canyon or Farrel Canyon Formations.…”

Section: Column 2 Osgood Mountainsmentioning

confidence: 99%

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Stratigraphy of lower to middle Paleozoic rocks of northern Nevada and the Antler orogeny

Ketner¹

2013

Professional Paper

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COVER. Lower Silurian Cherry Spring chert at the stratigraphic top of the Valmy and Vinini Formations regionally. This conspicuous white chert unit is invariably underlain by thick-bedded black chert of Late Ordovician age. The outcrop shown on the left is in Sonora, Mexico; that on the right is in northern Nevada. Sporadically, throughout its range, parts of the Cherry Spring chert are mineralized with iron, lead, and zinc sulfides resulting in intense colors as shown by the hand specimen from Nevada.

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New U–Pb constraints identify the end-Guadalupian and possibly end-Lopingian extinction events conceivably preserved in the passive margin of North America: implication for regional tectonics

et al. 2016

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The discovery and dating of a volcanic ash bed within the upper Phosphoria Formation in SE Idaho, USA, is reported. The ash occurs 11 m below the top of the phosphatic Meade Peak Member and yielded a 206Pb/238U date of 260.57 ± 0.07 / 0.14 / 0.31 Ma, i.e. latest Capitanian, Guadalupian. The stratigraphic position of this ash near the top of the Meade Peak phosphatic Member of Phosphoria Formation indicates plausible completeness of the sedimentation within the Guadalupian–Lopingian and probably at the Permo-Triassic (P-T) transitions. The new radiometric age reveals that the regional biostratigraphy and palaeontology of Phosphoria and Park City formations requires serious reconsideration, particularly in cool water conodonts, bryozoans and brachiopods. The new age proposes that the Guadalupian–Lopingian boundary (GLB) coincides with the Meade Peak – Rex contact and consequently with the end-Guadalupian extinction event. The lack of a major unconformity at the P-T transition suggests that the effects of the Sonoma orogeny were not as extensive as has been assumed.

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The Inskip Formation, the Harmony Formation, and the Havallah sequence of Northwestern Nevada — An interrelated Paleozoic assemblage in the home of the Sonoma orogeny

Cited by 7 publications

References 18 publications

The Lower Cretaceous King Lear Formation, northwest Nevada: Implications for Mesozoic orogenesis in the western U.S. Cordillera

The Lower Cretaceous King Lear Formation, northwest Nevada: Implications for Mesozoic orogenesis in the western U.S. Cordillera

Stratigraphy of lower to middle Paleozoic rocks of northern Nevada and the Antler orogeny

New U–Pb constraints identify the end-Guadalupian and possibly end-Lopingian extinction events conceivably preserved in the passive margin of North America: implication for regional tectonics

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