... for major elements, trace elements, and rare earth elements (REE) were obtained on 220 samples of unaltered and unmineralized siliciclastic rocks from the Upper Devonian-Lower Mississippian Endicott Group (Hunt Fork Shale, Noatak Sandstone, Kanayut Conglomerate, Kayak Shale), the overlying Carboniferous...

... allochthon forms the main crest and mountain front of the central Brooks Range. It is the structurally lowest of the allochthons in the region. Major rock units on the allochthon are: Upper Devonian Hunt Fork Shale and Noatak Sandstone, Upper Devonian-Lower Mississippian Kanayut Conglomerate...

...Figure 5 —Thickness of the undivided Noatak Sandstone and Kanayut Conglomerate and relations to selected lithofacies in Carboniferous rocks and basement rocks in the central Brooks Range. Isopachs and lithofacies distribitions reflect present-day positions. (A) Isopach map of the undivided Noatak...

... ). The lower part of the section consists of the Upper Devonian upward-shallowing marine Hunt Fork Shale (black shale, subordinate sandstone, siltstone and limestone: Nielsen, 1981 ), and the shallow marine Noatak Sandstone (carbonate-cemented quartzose sandstone and pebbly sandstone, and black shale: Moore...

..., interbedded shale and fine-grained sandstone ( Brosgé et al., 1979 ). The Hunt Fork Shale grades upward into the Upper Devonian Noatak Sandstone, which is composed of shallow marine, interbedded calcareous sandstone, siltstone, and shale ( Moore et al., 1989 ). The Noatak Sandstone is overlain by the Upper...

... thick clastic sequence, which consists of conglomerate, sandstone, and shale, and was formerly assigned to the lower part of the Noatak Formation, was renamed the Kanayut Conglomerate. Three members were recognized at the type locality near Shainin Lake. The uppermost member was called the Stuver Member...

... in the Key Creek plate (facies sensu stricto) is shown by the hachured bar. Note that discordant mineralization also is present in the Kanayut Conglomerate and Noatak Sandstone. The v pattern denotes tuff layers. ...

... 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...

...-Pb-Ag veins and breccias ( Fig. 1 ) are discordant in clastic rocks of the Endicott Group ( Fig. 3 ). Nearly all of the occurrences are hosted in the Noatak Sandstone or Kanayut Conglomerate ( Kelley and Mull, 1995 ; Kelley et al., 1997 ; Werdon, 1999a ), although veins are in the basal part...

...-equivalent anoxic basinal facies in the Mississippian, and finally to more oxidized marine deposits by Pennsylvanian time. The lowermost unit is the Upper Devonian to Lower Mississippian Endicott Group. Locally, its base consists of the Hunt Fork Shale and overlying Noatak Sandstone, which were deposited...

... Bluff formation: 900 feet black and gray shale with numerous thin beds of limestone. Brooks Range, central northern Alaska ( Payne, 1951 )—Noatak formation: more than 5,000 feet massive quartz-pebble conglomerate, with marine shale, limestone, and sandstone in the upper part; overlain by Lisburne...

..., and by the end of 1951 a geologic map on the scale of 1:96,000 of almost all of the Arctic Slope of Alaska will be completed. Other special studies included paleontologic studies for correlation purposes, heavy-mineral studies also for correlation purposes, petrology of sandstones, petrology of the Lisburne...

... orogeny ( Mull 1982 ; Moore et al . 1994 ). The EMA consists of a basal prograde–retrograde sequence of marine–non-marine–marine strata (from oldest to youngest): Hunt Fork Shale, Noatak Sandstone, Kanayut Conglomerate, and Kayak Shale ( Fig. 2 ). These rocks are interpreted to have accumulated...

... veins are found in stratigraphically lower units of the Endicott Mountains allochthon (e.g., Kanayut Conglomerate, Kayak Shale, Noatak Sandstone). The Kuna Formation consists of black carbonaceous (organic-rich) siliceous shale, mudstone, chert, and locally abundant carbonate turbidites ( Mull et al...

... (SO 4 > H 2 S). Moore et al (1986) and Young (1989) suggested that the reservoir for the metal-bearing fluids was clastic rocks of the Kanayut Conglomerate and/or Noatak Sandstone that stratigraphically underlie the Kuna Fm ( Fig. 3 ). Within the underlying clastic rocks, stratabound...

... sedimentation that grades vertically into more transgressive shallow marine conditions ( Moore and Nilsen, 1984 ; Moore et al., 1994 ; Handschy, 1998 ). The Endicott Group consists of four units. These are, from oldest to youngest, the Hunt Fork Shale, the Noatak Sandstone, the Kanayut Conglomerate...