...Figure 1. Mapped extent of basalt (Copter Peak allochthon), gabbro, and ultramafic rocks (Misheguk Mountain allochthon) in western Brooks Range and cross section showing klippe interpretation of allochthons (adapted from Foley et al., 1997 , Fig. 18; Moore et al., 1994 , Fig. 20; Harris, 1998...

..., 1990 : U.S. Geological Survey Bulletin 1999 , p. 141 – 155 . Moore , T.E. , 1987 , Geochemical and tectonic affinity of basalts from the Copter Peak and Ipnavik River allochthons, Brooks Range, Alaska : Geological Society of America Abstracts with Programs, v. 19 p. 434...

... and that it is always in thrust contact with underlying and genetically unrelated Copter Peak basalt. However, gabbroic intrusives are documented in shelf sediments of the Brooks Range allochthon, the Ipnavik River allochthon, the Nuka allochthon, and Copter Peak basalt ( Moore et al., 1986 ; Karl et al., 1989...

... three of the major allochthons found in the De Long Mountains of the western Brooks Range: the Brooks Range (Endicott Mountains), Picnic Creek, and Copter Peak allochthons. Rocks characteristic of parts of the Tpnavik River and Nuka Ridge allochthons are also present. The Endicott Mountains...

... allochthon (MMA) and Copter Peak allochthon (CPA) estimated from Figure 3 (this study). Recessed units on stratigraphic column denote mechanically incompetent units that are subject to structural detachment. Age scale is variable. See Figure 2B for allochthon abbreviations. Foreland basin deposits...

..., 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...

... (Siniktanneyak, Misheguk, Asik, Avan and Iyikrok, Fig. 1b ) that collectively span more than 200 km in the western half of the Brooks Range, composing what has been termed the Copter Peak allochthon ( Mull, 1982 ). All five complexes are similar in bulk composition, and they all probably had similar emplacement...

... 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...

... plateau or seamount setting. The exposures of the Angayucham units (Misheguk Mountain and Copter Peak allochthons) described here occur along a narrow zone that extends along the southern margin of the Brooks Range ( Figs. 1 and 2 ). These units have been interpreted as fault slivers of the highest...

...) The geochemistry of the BRO is most consistent with formation in an SSZ setting, followed by obduction during arc-continent collision and incorporation into the Brooks Range fold-and-thrust belt [ 20 ] (3) The metamorphic sole beneath the BRO is composed mostly of Angayucham (Copter Peak) basalt...

... The BRO is the structurally highest allochthon (the Misheguk Mountain allochthon) of the Brooks Range and overlies the Angayucham terrane, which is an imbricate stack of Late Devonian, Triassic, and Early Jurassic mafic oceanic crustal rocks represented by the Copter Peak allochthon [ 16 ]. The contact...

... an emergency response. The December 1991 Mount Cook rockfall was a spectacular and catastrophic event within Mount Cook National Park in New Zealand. Despite lowering the peak by 10 m and sending a mass of rock debris downslope for a distance of 7.5 km, this individual event was not a landslide disaster due...

.... An external insulation of 2.5 cm thic"kness. h~s been provided below the cladding. The power requirements are met by three 62.5 KVA generators (for duty, maintenance and stand by), the peak load of the' entire station being 40 KVA. The fuel depot was at a distance from the station. There is a 5000 liter tank...

... that the Brooks Range ophiolite is composed of at least two major thrust sheets: the Misheguk Mountain allochthon (Jurassic) and the Copter Peak allochthon (Triassic–Devonian?; Harris 2004 ; Fredriksson and Pease 2019 , 2022 ; Biasi et al. 2020 ). In addition to different ages, these thrust sheets have...

... of the Lisburne Group. This pattern of detachment geometry is comparable to that described above for the Endicott Mountains allochthon. Higher allochthons: Structurally higher allochthons, including the Nuka Ridge, Ipnavik River, Copter Peak, and Misheguk Mountain allochthons, are present in scattered...

... fault runs along the southern and western upper flank of a subsidiary peak of Mt. Vettore called “Cima del Redentore.” This fault trace is clearly visible from the Castelluccio basin and it is commonly called “Cordone del Vettore.” Pierantoni et al. (2013) also mapped three potential faults...

... , Kikiktat Mountain klippe: A link between the Copter Peak and Nuka Ridge allochthons, north-central Brooks Range, Alaska : Alaska Division of Geological and Geophysical Surveys Professional Report 111 , p. 77 – 88 . Stacey , J.S. , and Kramers , J.D. , 1975 , Approximation of terrestrial...

... to the obduction of the young and hot oceanic crust. Peridotite and gabbro of the Misheguk allochthon form the uppermost allochthon in the structure and are thrust over pillow-basalt and diabase of the Copter Peak allochthon (Angayucham terrane) ( Moore et al., 1994 ; Patton et al., 1994 ). The ophiolite...