Kekiktuk Conglomerate

Unit symbol: Mek
Age range Mississippian (393.3 to 323.3 Ma)
Lithology: Sedimentary
Group name: Endicott Group, undivided
Resistant massive quartzite and granule to cobble quartzite and quartz conglomerate; clasts are well-rounded gray chert, quartz, and quartzite (Mayfield and Tailleur, 1978). Quartzite generally light-gray, clean, well-indurated and weathers light-gray; locally iron-stained. Conglomerate is interbedded and lenticular in quartzite beds; clasts of the conglomerate predominantly quartzite and chert. Locally contains anthracite (Reiser and others, 1980). Unit is considered Early Mississippian on the basis of plant fossils and trace fossils Scalarituba and Skolithos (Nilsen, 1981, Dutro, 1987). In the Ambler River, Survey Pass, and Wiseman quadrangles, consists of conglomerate that contains clasts of quartz, chert, quartzite, slate, and minor thin layers of metasandstone and phyllite (Till and others, 2008a). According to Till and others (2008a), “Quartz and chert clasts are most common; chert clasts are varicolored. The matrix of the conglomerate is composed of quartz, white mica, and chlorite, and clasts are typically stretched. Phyllite may be gray, green, or red.” Unit is typically mapped in the central Brooks Range, but also included here are areas mapped as Kekiktuk or Kanayut Conglomerate in the Table Mountain and Coleen quadrangles (Brosgé and Reiser, 1969, Brosgé and others, 1976)

Source map information

Source map Wartes, M.A., Wallace, W.K., Loveland, A.M., Gillis, R.J., Decker, P.L., Reifenstuhl, R.R., Delaney, P.R., LePain, D.L., and Carson, E.C., 2011, Geologic map of the Kavik River area, northeastern Brooks Range, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigation 2011-3A, 14 p., 1 sheet, scale 1:63,360.
Symbol Mkt
Unit name Ellesmerian Megasequence - KEKIKTUK CONGLOMERATE
Description Gray-brown-weathering, resistant, massive, fine- to very-fine-grained quartzite and indurated siltstone. Confined to southwestern part of map area, in core of Echooka Anticlinorium. Regional interpretations suggest deposition in fluvial systems, although marginal marine influence in the upper part is possible where it transitions upward into the Kayak Shale (LePain and others, 1994). Thickness is regionally influenced by paleotopographic relief on the basal unconformity (LePain and others, 1994); thickness in field area is poorly constrained, but probably not more than a few tens of meters
Lithology Sedimentary

Correlated geologic units

Label Mke
Description Endicott Group, Kekiktuk conglomerate (Mke, AR002; DP004; ML002; Mke, Mke?, SP002) [Overprint symbol 14]
Geologic age Tournaisian to Mississippian
Geologic setting Sedimentary, deltaic-and-nearshore
Lithology Form Importance
Conglomerate < Clastic < Sedimentary Bed Major
Sandstone < Clastic < Sedimentary Bed Indeterminate, major