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Source map Mull, C.G., and Sonneman, H.S., 1968-1974, Unpublished data
Symbol Mkk
Unit name Kekiktuk Conglomerate
Description Quartzose sandstone and quartz and chert-pebble conglomerate, with interbedded black shale and thinner bedded sandstone and conglomerate in upper part; forms vertical cliffs and upland areas. Clasts dominantly quartz and black chert. Includes Mkkv in extreme NW part of quadrangle. Overlies major regional angular unconformity that truncates pre-Mississippian rocks, including Middle Devonian Ulungarat Fm in northern part of quadrangle. Contacts uncertain in Double Mountain area, where it probably contains areas of Ulungarat Formation (Du) of Anderson and others, (1991). Autochthonous/parautochthonous
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