Spilitic pillow basalt and diabase

Unit symbol: Ksbd
Age range Early Cretaceous? (145 to 100.5 Ma)
Lithology: Igneous - Volcanic
Group name: Mafic and shoshonitic volcanic rocks
Dark-greenish- to reddish-brown, fine-grained, spilitic amygdaloidal pillow basalt flows and dark-greenish-gray, medium- to coarse-grained, spilitic diabase intrusive rocks (Patton and others, 1968; Patton and others, 2009), primarily in the Shungnak quadrangle. Unit inferred to overlie unit KJiv and in turn be overlain by unit Kvu. Unit most likely extends southwestward into the Candle quadrangle, where it has not been distinguished from the large area of Quaternary or Tertiary alkalic basalt (unit QTv, herein) there and in the Kateel River quadrangle

Source map information

Source map Wilson, F.H., Labay, K.A., Shew, Nora, and Mohadjer, Solmaz, 2005, Digital datasets for geologic map by Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and, Shew, Nora: Preliminary Integrated Geologic Map Databases for the United States: Digital Data for the Reconnaissance Geologic Map for the Yukon-Koyukuk Basin, Alaska: U. S. Geological Survey Open-File Report 2005-1341, on-line only.
Symbol Kbd
Unit name Spilitic pillow basalt and diabase
Description Dark greenish- to reddish-brown, fine-grained, spilitic amygdaloidal pillow basalt flows and dark-greenish-gray, medium- to coarse-grained, spilitic diabase intrusive rocks. Unit added in northwest corner by Patton (2000).
Lithology Igneous

Correlated geologic units

Label Kbd
Description Spilitic pillow basalt and diabase , see also 2230
Geologic age Early-Cretaceous
Geologic setting Extrusive
Lithology Form Importance
Basalt < Mafic-volcanic < Volcanic < Igneous Flow, pillows Major
Hypabyssal-basaltic-andesite < Mafic-hypabyssal < Hypabyssal < Igneous Dike or sill Indeterminate, major