Qa
Quaternary
surficial alluvium and colluvium
Qao
surficial older alluvium and colluvium
Qe
surficial eolian deposits
Qg
surficial glacial deposits
Ql
surficial Lake Bonneville deposits
Qm
surficial marsh deposits
Qs
surficial mud and salt flat deposits
Qls
surficial landslide deposits
Qb
volcanic rocks-mostly basalt
Qr
Pliocene
volcanic rocks-rhyolite
QT
Miocene-Pleistocene
high-level alluvial deposits
Tpb
Tpr
Tmv
Miocene
volcanic rocks
Tmr
Tmb
volcanic rocks-basalt, rhyolite, andesite, tuffaceous rocks
Tma
volcanic rocks-andesite
T5
Miocene-Pliocene
Sevier River, Browns Park, Castle Valley Fms
T4
Oligocene-Pliocene
Salt Lake Fm and other valley-filling alluvial, lacustrine, and volcanic units
Tov
Oligocene
Tvu
Tertiary
volcanic rocks-Tertiary
Ti
intrusive rocks-Tertiary
T3
Eocene-Oligocene
Duchesne River, Uinta, Bridger, Crazy Hollow and other Fms
T2
Eocene
Green River, Fowkes and other Fms
T1
Cretaceous-Eocene
Wasatch, Cotton, Flagstaff, Claron, White Sage and other Fms
TK
Paleocene-Cretaceous
Evanston, North Horn, Currant Creek, Canaan Peak and other Fms
K3
Cretaceous
Mesaverde Group, Price River, Kaiparowits, Echo Cyn and other Fms
K2
Indianola, Mancos, Frontier, Straight Cuffs, Iron Springs and other Fms
K1
Dakota, Cedar Mountain, Kelvin and other Fms
Ji
Jurassic
intrusive rocks-Jurassic
J2
Morrison Fm
J1
Summerville, Entrada, Carmel, Arapien, Twin Creek and other Fms
Jg
Glen Canyon Group (Navajo, Kayenta, Wingate, Moenave Fms) and Nugget Ss
Tr2
Triassic
Chinle, Ankareh Fms
Tr1
Moenkopi, Dinwoody, Woodside, Thaynes and other Fms
P2
Permian
Kaibab, Toroweap, Park City and other Fms
P1
Cedar Mesa, Diamond Creek, Arcturus and other Fms
PP
Penn.- Permian
Oquirrh Group, Wells, Weber, Ely, Callville and other Fms
P
Pennsylvanian
Morgan, Round Valley, Honaker Trail, Paradox, Ely and other Fms
M3
Mississippian
Chainman, Manning Canyon, Doughnut and other Fms
M2
Great Blue, Humbug, Deseret and other Fms
M1
Redwall, Madison, Gardison, Ludgepole and other Fms
D
Devonian
Devonian Formations
S
Silurian
Laketown, Bluebell Dolomite
O
Ordovician
Fish Haven, Swan Peak, Garden City, Eureka and other Fms
C3
Cambrian
St. Charles, Nounan, Bloomington and other Upper Cambrian Fms
C2
Middle Cambrian Fms
C1
Prospect Mountain, Tintic, Ignacio, Geertsen Canyon and other Fms
PCs
Proterozoic
sedimentary and metasedimentary Fms
PCi
Precambrian
intrusive rocks-Precambrian
PCm
metamorphic rocks
water
playa