Prichard Formation. (IDYp;0)

Prichard Formation.

Siltite, quartzite, and argillite in northern Idaho; deposited in deep water and contains voluminous ~1470 Ma mafic sills. Includes siltite, quartzite, fine-grained schist, and carbonate rocks structurally above anorthosite near Boehls Butte, northeast of Elk River. (Mesoproterozoic Belt Supergroup).

State	Idaho
Name	Prichard Formation.
Geologic age	Mesoproterozoic
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > Argillite Metamorphic > Metasedimentary > Metaclastic > Quartzite Metamorphic > Metasedimentary > Metaclastic > MetasiltstoneSiltite. Minor Metamorphic > SchistFine-grained schist. Sedimentary > CarbonateCarbonate rocks structurally above anorthosite near Boehls Butte.
References	Lewis, Reed S., Link, Paul K., Stanford, Loudon R., and Long, Sean P., Geologic Map of Idaho, 2012, Idaho Geological Survey, Geologic Map 9 (M-9); Scale 1:500,000.
NGMDB product	NGMDB product page for 97750
Counties	Benewah - Bonner - Boundary - Clearwater - Kootenai - Shoshone

Prichard Formation.

Lewis, Reed S., Link, Paul K., Stanford, Loudon R., and Long, Sean P., Geologic Map of Idaho, 2012, Idaho Geological Survey, Geologic Map 9 (M-9); Scale 1:500,000.