Laramide (Maastrichtian–Paleocene–Eocene) and mid-Tertiary (Oligocene–Early Miocene) uplifts,
basins, and igneous centers of the Colorado Plateau: (a) Laramide uplifts (CC–Circle Cliffs, De–Defiance, Ka–
Kaibab, Mi–Miners, Mo–Monument, Na–Nacimiento, Ne–Needles, SR–San Rafael, Un–Uncompahgre, Zu–Zuni);
(b) Laramide basins (Ba–Baca, G-W–Gunnison-Wasatch Plateaus, PC–Piceance Creek, SJ–San Juan, TC–Table
Cliff, Ui–Uinta); (c) mid-Tertiary volcanic fields (Ma– Marysvale, 31-24 Ma; M-D–Mogollon-Datil, 39-24 Ma; SJ–
San Juan, 35-23 Ma); (d) Laramide (X) and mid-Tertiary (+) laccolith clusters(Ab–Abajo, 29-23 Ma; Ca–Carrizo,
74-70 Ma; He–Henry, 31-23 Ma; LP–La Plata, 68 Ma; LS–La Sal, 29-26 Ma; SM–San Miguel, 65-60 Ma; Ut, Ute,
72 Ma; WE, West Elk, 35-30 Ma). Laccolith ages from Cunningham et al. (1994), Garcia et al. (2010), Murphy et
al. (2000), Nelson (1998), Nelson et al. (1992a, 1992b), Semken and McIntosh (1997), and Sullivan (1998). Chuska
erg remnant after Dickinson et al. (2010b).
https://library.azgs.arizona.edu/item/AGCR-1552429216970-862
Photographer: William Dickinson
Photo Date: 2018