Alkalic extrusive and intrusive igneous rocks

Leucite- and nepheline-rich flows, scoria, and necks.
State Wyoming
Name Alkalic extrusive and intrusive igneous rocks
Geologic age Quaternary
Lithologic constituents
Major
Igneous > Volcanic > Alkalic-volcanic (Flow)leucite
Igneous > Plutonic > Foidal-syenitic (Flow)nepheline
References
NGMDB product
Counties Sweetwater