A
= Arches National
Park
C = Canyonlands National
Park
H = Hovenweep National
Monument
N = Natural Briges
National Monument
|
Area
Found
|
Name
of
Rock Strata |
Geologic
Period
|
Millions
of Yrs
Ago
|
|
Nearby
|
Abajo
Mtns.
Henrys Mtns.
La Sal Mtns.
|
Tertiary
|
1.6
.
65
|
|
Nearby
|
Mesa
Verde Group |
Cretaceous |
65
.
144
|
|
A
|
Mancos
Shale |
|
A,H
|
Dakota
Sandstone |
|
A,H
|
Cedar
Mtn/Burro Cyn |
|
A
|
Morrison
Formation |
Jurassic |
144
.
.
208
|
|
A
|
Entrada
Sandstone |
|
A,C
|
Navajo
Sandstone |
|
A,C
|
Kayenta
Formation |
|
A,C
|
Wingate
Sandstone |
|
A,C
|
Chinle
Formation |
Triassic |
208
.
245
|
|
A,C
|
Moenkopi
Formation |
|
A*,C
|
White
Rim Sandstone |
Permian
*Cutler
Undivided
|
245
.
.
286
|
|
A*,C
|
Organ
Rock Formation |
|
A*,C,N
|
Cedar
Mesa Sandstone |
|
A*,C
|
Lower
Cutler/Halgaito
Shale |
|
A,C
|
Honaker
Trail Formation |
Pennsylvanian |
286
.
320
|
|
C
|
Paradox
Formation |
