UTAH GEOLOGICAL SURVEY a division of Utah Department of Natural Resources

STRATIGRAPHIC COLUMN Map Thickness Plate Tectonic Depositional Dominant Rock Type Series Map Unit Notes Intrusive units and and additional lumped units Ma System Stage Symbol feet meters Setting Environment and Weathering Profile 40Ar/ 39Ar ages y e r e n a n e n e c d r Stacking order of Tertiary units is approximate because of c o

n Surficial deposits e t o t l a s

Qb u

i sand and gravel, a o Various n e a

u and l erosion dominant age overlap and age uncertainty; not all units are in contact H o P Q

e basaltic lava flows i

basaltic lava flows Q, QT t 1.8 s as shown. Lithology not shown for Tertiary basaltic and a l n e P andesitic flows, intrusions, Muddy Creek Formation, and t t

l x o u

e lumped units. Unconformities not shown for Tertiary units. d r

a f a e e

r

p Basin-fill g e o p e l +

n fault-bounded basins n conglomerate, + u n o sedimentary 0

a a Ts 0 e r d 0 to west, but erosion sandstone, siltstone, c C - 5 i c

n rocks 5 r f n 4 a o i r dominates SW Utah.

1 mudstone i

o l r s

u

e Virgin River integrated P a Tmcb n H Muddy i d w b g with Colorado River o e Tmc + f r

l Creek + 0 d o a i 0

Fm. 0 t v 0 i m 0 e 9 - 3 d s

young rhyolite n 0 0 n r n 0 5 u 2 to 8.5 Ma e r o

and dacite lava Trdy lava flows

5.3 t 5

1 e , , s p s

p flows e

Tb m w u Large quartz monzonite boulders s w

old boulder gravel deposits Tag i o conglomerate alluvial fan 11.6 l 30 9 f f n on Kolob Plateau (derived from Tipv)

o a

a c e l v s o a n

middle rhyolite l 400- 120- p v

o

i l c Trdm a i l e

lava flows s l

and dacite lava l t 1400 400 a y l d u o d a r d a i t c

flows o d s

m n ) i t a d m Mineral Mtn. i a n b n n i B e a

intrusion M

a s 14.0 Ma m

To t Ox Valley Tuff 4000 1200 ash-flow i e 1 n . r Kane Springs T

tuffs u 2 p

Kane Wash Tuff Tkw 30 10 Wash caldera 14.45 Ma o 1

16.0 o ( t M

l s s a e f r f u e u n t i n

i t n w M o o l c f

Telegraph - t f h Racer Canyon i l Tr 1500 450 Draw caldera of s ash-flow p a

Tuff u f tuff Caliente

; 18.7 Ma o )

e caldera complex s n e c e r c u o o g i s l O - e

Sedimentary Rocks of n river and s

Tpr 200 60 e conglomerate, sandstone n

Page Ranch i

c alluvial fan s ) o h a a t E i b ( l

derived from M . o

e c t 5 S

eruption of n 20.4 Ma . . i c n 0 a a e U e l Pine Valley t

2 r

v n ( n

Pine Valley n m y e p e

r laccolith, triggered i o lava flows p

Tpv e c

w 1100 335 l e T d l t Latite o o m o

l by rapid laccolith i l e r a s e d e e V M

i emplacement v t

v w e n e i

and consequent i f

d ) n d

i o d a n

a large gravity P t n r u f M

i a

e l , slides (Tgb)

6 s d p s Gravity slide breccia Tgb l breccia

250 75 8 u y d w a .

r n n o c 1 d l

a

Volcanic rocks of Comanche o f a i 2 i n l

Tcv d

t ash-flow tuff & lava flows 21.78 Ma Canyon 160 50 Stoddard Mtn. ( s a h r a n

u v intrusion g Ta ) e a r i n

t a e T l h o ) n i

) d n m i i a

s c c a e s i i i T y t u ) c i n M r r M n i

t a

o s a a a 0 n 2 e c E i c M l n 0 -

l

0 D d . .

o o e o 8 ) n w i 2 2 e V v n 9 d n a s o

2 . 2 h l e ( l e o u (

Rencher e i 21.46 Ma to 22.01 Ma 1 Tre T r c o 1600 500 Bull Valley ash-flow d t n s 2 i o h u l ( n H u i Formation l i e tuff

intrusion r a

l c t T e b k y a l i n l n i i e b

T P

a m l l ( - s b n b

t i i a c i a l s a r V T n t a n

c i l u c l n s ( s

, u u d a b r e o B b v g

a i M e T

s H n g o i i l a p B t

x 21.62 Ma to 21.97 Ma n Pinto Peak lava flows and E s Rocks of Paradise Tpa 600 180 o f

intrusion f

m ash-flow tuff u r t

e t w n i o

l f Harmony f - o Bull Valley

h Hills Tqh 500 150 t 22.03 Ma s

n Mountains a e Tuff f m o

Quichapa p ash-flow Condor s

o Caliente l e Group Canyon Tqc 330 110 tuff l c e 22.8 Ma mostly Bauers Tuff Mbr. c

caldera r v Fm. q u e

23.0 T o D Tq Caliente s Leach Canyon Tql Formation 500 150 caldera? 23.8 Ma r e i e p c w n p c q e u q c Isom Fm. and ash-flow tuff, T o Indian 26 to 27 Ma T g Ti i enclosing sedimentary 600 180 limestone, and l Tiw Peak

O rocks tuffaceous caldera sandstone

28.4 r

e Needles Range Group Tw 50 15 30 Ma Wah Wah Springs Fm. w

o unconformity l 0 33.9 upper 0 limestone 2 Tcu 6 5 member 1

0 river and lake e 0 Claron 0 n 6 Tc 9 sediments modified e 1 Formation 4 Pine Valley laccolith - -

c by soil formation mudstone, 0 0 0 o intruded here 0 0 lower 9

9 siltstone, and E 3

Tcl 3 0 3 d member sandstone 1 n a

e n e c

o unconformity e l a P g TKg lacks volcanic clasts n i

Grapevine Wash t TKg 2000 600 l Formation u a conglomerate f

river and t and Canaan Peak 0- 0- s alluvial-fan 65.5 TKcp u sandstone r TKcp has Jurassic volcanic clasts Fm. 120 35 proximal h t n i

s unconformity a

tectonic breccia (?) Ktm 0-330 0-100 b fault breccia

below Square Top Mtn. thrust p 0 0

. fault zone e s t 0 upper 2 e mudstone and u m

h Ksu 1 3 d

r floodplain, river, F o g > > i

unit e sandstone e y r e s a 0 p 5 n f lagoonal, r o c 5 f 3 t Tibbet e p i e 4 l F 1 a - - g S t Canyon g

0 estuarine

Kst 0 U l shoreface sandstone 5 C 0 4 o e 7 0 Mbr u 2 r 2 r enviroments 0 b o

Iron 2 )

4 e C 1

r gastropods, coal - r d of coastal plain; - r e 0

Springs o i

Ki 0 f

Dakota Fm o 0

v Tropic is 0 c s Formation 0 e 9 0 0 e u and 3 mudstone, siltstone, r

S westward-thinning 6 5

large landslides Kdt o 8 2 k sandstone Tropic Shale, e marine tongue c distal c o a r

undivided t

e n r i

C

p unconformity

u r 99.6 Lower Cedar Mountain Fm. Kcm 0-100 0-30 a river and alluvial plain conglomerate J e g

145.5 K unconformity K . w y o Winsor Mbr. Jcw 0-320 0-98 . sandy mudflat sandstone and siltstone n L i - m s

c i a 0

Paria River Mbr. Jcp 0-160 0-50 s restricted shallow marine gypsum and limestone b alabaster gypsum 6

s (

e a h Carmel Crystal Creek r coastal sabkha and e g

l Jcx 0-250 0-75 l mudstone and siltstone g u

Member Jc i d u Formation J tidal flat h

d b

r i Isocrinus sp. k e c M

Co-op Creek p

285- 87- a Jcc p shallow marine micritic limestone Limestone B

580 177 U Member J-2 unconformity? Temple White Throne Mbr. Jtw 0-130 0-40 coastal dune field sandstone sandstone ledge pinches out westward Cap Sinawava Mbr. Jts <10- <3- coastal sabkha and in Zion N.P. Formation 400 120 tidal flat siltstone and mudstone 175.6 J-1 unconformity 169 to170 Ma c i s s

a vast eolian dune r

u Broad, nearly field of arid J 1800- 550- Jn flat continental west coast tropical sandstone large, sweeping cross-beds Navajo Sandstone 2300 700 desert; basal part interior is sabkha locally prominent joints deposits r e w o L transition zone planar bedded

Tenney 5 5 1 distal river and

3 9 siltstone, sandstone, - Canyon Jkt - 3 0 playa and mudstone 4 4

Tongue 1 Kayenta Jk sandstone ledge, pinches out m w Formation Lamb Point Tong. 0-60 0-18 eolian dune field sandstone k o l

west of Zion N.P. ^ Jnl f

550- 165- distal river, playa, siltstone, sandstone, J upper part t m 1500 460 s minor lake and mudstone e a prominent cliff; Silver Reef e w r

Springdale Ss. Mbr Jks 90-150 27-45 t h braided stream sandstone mining district t s r

t J-sub Kayenta unconformity Whitmore Point and o

Moenave 200- 60- Development n river, lake, and sandstone, siltstone, Dinosaur Canyon n

199.6 J^m a floodplain fish fossils 390 115 o Mbrs, undivided n limestone t Formation of island arc i c r “J-0” unconformity e m 400- 120- at west edge of claystone, mudstone, m p Petrified o floodplain, lake, Chinle ^cp ^

p numerous landslides J Forest Mbr. 650 200 North D stream sandstone U Formation Shinarump Cgl. Mbr ^cs 5-250 2-75 America braided river sandstone and conglomerate prominent cliff 228.0 TR-3 unconformity siltstone, sandstone, upper red ^mu 200- 60- tidal flat member 600 180 and mudstone c u i Shnabkaib tidal flat and gypsum, mudstone, “bacon-striped” ledgy slopes s 350- 105- ^

s ^ms Member coastal sabkha and siltstone a 1000 300 i r k k r T P e P Moenkopi ^m c w ^ m o

Formation ^ L

middle red 300- 90- mudstone, siltstone, t

^mm tidal flat P 550 170 gypsum

member m ^ Virgin Ls. Mbr. ^mv 0- 0- shallow marine limestone and mudstone 3 limestone ledges to east 250 75 t

n 5 limestone ledges to west lower red ^ml 0- 0- e mudstone and siltstone

n tidal flat

300 90 i

member t r n Timpoweap Mbr. ^mt t 50-180 15-55 shallow marine o limestone and mudstone m f c l ^ Rock Canyon Cgl. Mbr ^mr 0-200 0-60 r river channel conglomerate e

251.0 e TR-1 unconformity h

0- 0- p

Harrisburg Mbr Pkh s shallow marine & sabkha gypsum, limestone

u gypsum Kaibab 350 100 l s a

Pk t brachiopods

Fossil 200- 60- a

Formation Pkf n cherty limestone e shallow marine “black-banded” cliff Mountain Mbr 300 90 e g t n i n

P-k unconformity k t a n Woods Ptw 65- 20- shallow marine limestone, siltstone, gypsum P P o Ranch Mbr

f and sabkha gypsum Toroweap 870 265 c

o Pt f

s Formation 160- 48- e i Brady Canyon Mbr n l i Ptb b limestone, gypsiferous

t shallow marine e

250 75 g r r P siltstone Seligman Mbr Pts 30-200 9-60 - a P-tw unconformity w m o

l

q n r y k r e P n t e s r a v i e e “stair-step” topography m w w

r o

r shallow marine, e L Queantoweap 1400- 425- a beach, coastal P Pq e sandstone Sandstone 2000 600 N dune field 0 0

5 6 dolomite with 2 8 - - Pakoon ) Pp minor limestone 0 0 h s Dolomite 0 8 and gypsum a 6 1 W

299.0 . P-0 unconformity m m a F s

0 D b 0 g c

0 r n r 0 n p * 0 i e a e 6 r i 2 P p * v 0 p n p 0 a limestone with P 0 S a 0 e

U 0

v 6

Callville d lesser siltstone, B l 2 - o r

*c - i t f y 0 sandstone, and 0 r o s Limestone B 6

0 e t y n 4 dolomite y 5 s n n w b 1 e

e o e d g g w L P ( e o n

i r v d o o i

r s m e b l e t u r

r unconformity

318.1 n s e

Scotty Wash Quartzite and a p A t n

p Msc 160 50 sandstone and shale Msc absent in Beaver Dam a

n Chainman Shale, undivided e e U r t e a h

i Mountains t s ) f

w p h o t

h n s t t p e i a i s o a t i 0 0 b e s r

s W w r i

5 6

w r 0 y s u ( e 0 i l

2 8 r m d C i 0 Redwall m - -

e a 0 s

a limestone e w Mr 0 e n S t 5 8 t D 3 M s

d o

o i 1 n a 1 8 r Limestone t i d n L o s e 1 6 c n u M v e M a o a o m i

Thunder Springs Mbr e . s b L B n

s a d a i

359.2 e n n c n i v o a i i r v i o l t i - e o n a 440- 135- s

g dolomite and t p d o o

Dm r n

Muddy Peak Dolomite n p r

v 680 207 sandstone o e O e l U e

m a i D

, 416.0 d shallow unconformity e e n s marine i

l s e l g o r n t i n h

o h c

a , t Nopah Dolomite _n 1300 400 t dolomite s U

a

; e

n o o t t

f a l r e r c

h e u n s

p Dunderberg Shale

_ l a p c a equivalent ? M i t U r n e e m n i t A

n h o t r c

o e l N

b

f banded light and dark gray a o t

s n

i d g r n a a dolomite, with

t m s 501.0 silty limestone e Bonanza King n _bk 2600 800 r in lower part w e

Formation t u o n s t

_ e a i n i r w

s t b a a

b m e

n l a i e d s n C d i a i r b a

M e m n i r a Chisholm Shale m - equivalent? w o l 250- 75- l shale, siltstone, 513.0 Bright Angel Shale _ba a 350 100 h sandstone s

g n i d i s b r u e s

w intertidal and orthoquartzite and y l o Tapeats Sandstone _t 1300 400 nearshore

L pebble conglomerate w o l S

542.0 Great Unconformity 1.2 billion year gap gneiss, schist, Part of the Paleo- Xu metamorphic and gneiss, schist, proterozoic pegmatite Mojave Province igneous rocks pegmatite about 1.7 billion years old