Basalt flows and intrusive igneous rocks (WYQb;0)

BASALT FLOWS AND INTRUSIVE IGNEOUS ROCKS. Yellowstone area--Includes Osprey, Madison River, Swan Lake Flat, and Falls River Basalts, basalts of Mariposa Lake, Undine Falls Basalt, and gravels, sands, silts, and basalts of The Narrows. In and adjacent to Absaroka and Washakie Ranges--Includes basalt of Lava Mountain (age about 0.5 Ma).

State	Wyoming
Name	Basalt flows and intrusive igneous rocks
Geologic age	Phanerozoic \| Cenozoic \| Quaternary \| Pleistocene
Original map label	Qb
Primary rock type	basalt
Secondary rock type
Other rock types	gravel; sand; silt
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basalt (Flow) Incidental Unconsolidated > Fine-detrital > Silt (Alluvial) Unconsolidated > Coarse-detrital > Sand (Alluvial) Unconsolidated > Coarse-detrital > Gravel (Alluvial)
Map references	Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey. [http://pubs.er.usgs.gov/publication/ofr83802]
Unit references	Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey. [http://pubs.er.usgs.gov/publication/ofr83802]
Geographic coverage	Fremont - Park - Teton