... of the Misheguk Mountain sheet intruded into continental margin sequences that they now structurally overlie. However, no intrusive contacts with these rocks are found, nor do we know of a viable mechanism for intruding tectonized peridotite up through continental margin sequences as shown in their Figure 4...

...Figure 3. Geology (see Fig. 2 ) and gravity data of Noatak region. Contours are isostatic residual gravity values; measurement locations shown as x. Gravity highs >15 mGal closely correlate with mapped gabbro and ultramafic rocks at Avan Hills (AH), Misheguk Mountain (MM), and Asik...

... and ultramafic rocks underlie basalt. These are fundamental constraints that need to be honored in structural interpretations for the region. Field and contact relations. (1) Harris et al. state that gabbro of the western Brooks Range is part of the structurally highest Misheguk Mountain allochthon...

... Valley and, in northwest Alaska, are equivalent to the upper Nasorak and Kogruk Formations (Lisburne Group) along Nasorak Creek near Point Hope, and the Kogruk Formation at Trail Creek, De Long Mountains, Misheguk Mountain quadrangle. The upper, light-colored, thicker-bedded interval at the West Fork...

... was most likely southerly ( Young, 2004 ). In the following sections, we detail the lithofacies, age, and depositional setting of both deep- and shallow-water strata of the Lisburne Group in the western Brooks Range ( Fig. 1 ). In the Red Dog area (De Long Mountains, Noatak, and western Misheguk...

... units in the De Long Mountains are informally designated as follow: Foothills unit (northernmost and structurally lowest):—(a) Permian(?), Triassic, and Jurassic chert, shale, and limestone, (b) Early Cretaceous (Valanginian) shale with Buchia -bearing coquinoid limestone, and (c) late Early Cretaceous...

...Fig. 2 —Structure sections across ophiolite klippen of western Brooks Range. A, hills near Avan River. B, west part of Misheguk Mountain. C, east part of Misheguk Mountain. D, Siniktanneyak Mountain (see Fig. 3 ). E, same as D, showing location and attitude of basaltic dikes. T1 , fault...

... on allochthonous sheets of the Brooks Range and foothills, is mapped on all but the Misheguk Mountain and Copter Peak allochthons, the uppermost of the sheets that form the western and central Brooks Range ( Tailleur et al, 1966 ; Martin, 1970 ; Mayfield et al, 1978; Ellersieck et al, 1979; Mull, 1979...

... of the western Brooks Range ( Curtis et al., 1984 , 1990 ; Ellersieck et al., 1990 ; Kelley and Jennings, 2004 ) and for autochthon in eastern North Slope and Brooks Range ( Moore et al., 1994 ) and Lisburne Peninsula (in parentheses) ( Campbell, 1967 ; Moore et al., 2002 ). Thicknesses for Misheguk Mountain...

...F ig . 1. Generalized map of northern Alaska showing the tectonic components of the Brooks Range (modified from Karl and Mull, 1993 ). Locations discussed in text. (1) Iyikrok Mountain (2) Red Dog (3) Anarraaq (4) Husky (5) Asik Mountain (6) Maiyumerak Mountain (7) Avan Hills (8) Misheguk Mountain...

... as evidence for eruption of the basaltic rocks in oceanic plateaus such as seamounts and oceanic islands. However, based on crystallization sequences and mineral chemistries of rocks in the Misheguk Mountain allochthon, Harris (1995) suggested that crystallization occurred in an arc, rather than an oceanic...

..., P) include the Copter Peak and Misheguk Mountain allochthons of the western Brooks Range, and the Narvak and Kanuti structural panels along the south side of the Brooks Range. The Copter Peak and/or structurally overlying Misheguk Mountain allochthon are preserved in three areally extensive volcanic...