Mafic igneous-clast conglomerate, sandstone, and mudstone

Unit symbol: Kipc
Age range Lower Cretaceous (113 to 100.5 Ma)
Lithology: Sedimentary
Group name: Mafic igneous-clast conglomerate, sandstone, and mudstone
Massive, poorly stratified and poorly sorted conglomerate composed of pebble- to cobble-size clasts in a graywacke and mudstone matrix in west-central Alaska (Patton and others, 2009). Clasts are predominately mafic intrusive and extrusive rocks, varicolored chert, and locally, metagraywacke. Limestone, quartz, and granitic rock clasts present in subordinate amounts. Conglomerate is interbedded with mafic- and calcareous-clast graywacke and mudstone. Unit composed chiefly of debris thought to be eroded from the Angayucham-Tozitna terrane (Patton and others, 2009). Unit stratigraphically underlies unit Kqc. Contains marine mollusks of Early Cretaceous(?) age in the Selawik quadrangle

Source map information

Source map Nelson, S.W., and Grybeck, Donald, 1980, Geologic map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176A, 2 sheets, scale 1:250,000.
Symbol Kc
Unit name Igneous Pebble Conglomerate
Description Interbedded brownish-gray poorly sorted volcanic sandstone and conglomerate containing well-rounded clasts of green chert and diabase.
Lithology Sedimentary

Correlated geologic units

Label Kipc
Description Igneous pebble-cobble conglomerate, Albian and Late Cretaceous?
Geologic age Albian
Geologic setting Sedimentary, shallow-marine-siliciclastic
Lithology Form Importance
Conglomerate < Clastic < Sedimentary Bed Major