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Talus Cones and cliffs, Montana

Talus cones and cliffs of Proterozoic Grinnell Formation capped by Empire Formation, Glacier National Park, Montana. The Grinnell is part of the Belt Supergroup. (220720-40)

Talus cones and cliffs, northern Montana (vertical)

Talus cones and cliffs of Proterozoic Grinnell Formation capped by Empire Formation, Glacier National Park, Montana. The Grinnell is part of the Belt Supergroup. (220720-36)

Bi-directional cross-bedding in sandstone

Bi-directional cross-bedding in sandstone of the Proterozoic Grinnell Formation, Glacier National Park, Montana. The Grinnell is part of the Belt Supergroup. (220720-29)

220720-26

Large ripples (dunes) Grinnell Fm, Montana

Large ripples (dunes) in river-transported sediment: Proterozoic Grinnell Formation, Glacier National Park, Montana The Grinnell is part of the Belt Supergroup. (220720-23)

Grinnell Formation and glacial horn, Montana (vertical)

Cliff of Proterozoic Grinnell Formation, Glacier National Park, Montana. The Grinnell is part of the Belt Supergroup. (220720-22)

Grinnell Formation and trail, Montana (vertical)

Trail cut into cliff of Proterozoic Grinnell Formation, Glacier National Park, Montana. The Grinnell is part of the Belt Supergroup. (220720-18)

Listric normal fault and Great unconformity, SW Montana

Listric normal fault offsetting and rotating Precambrian-Cambrian nonconformity, SW Montana. Geologist is standing next to Proterozoic schist that is cut by a pegmatite dike. It’s all overlain by a Cambrian basal conglomerate (in shadow), overlain by the Flathead Sandstone (220717-27)

Listric normal fault and rotation, SW Montana

Listric normal fault offsetting and rotating Precambrian-Cambrian nonconformity, SW Montana. hammer is on Proterozoic schist overlain by a Cambrian basal conglomerate, overlain by the Flathead Sandstone (220717-21)

Basal conglomerate at pC-Cambrian Nonconformity, MT

Cambrian basal conglomerate beneath Cambrian Flathead Sandstone on top Proterozoic schist at the Great Unconformity, here a nonconformity, southwestern Montana (220717-20)

Slaty cleavage and bedding, Montana

Slaty cleavage and bedding in limestone of the Mississippian Madison Group, SW Montana. (220717-7)

Slaty cleavage and bedding, Montana (vertical)

Slaty cleavage and bedding in Mississippian Limestone, SW Montana. (220717-6)

Asymmetric anticline in limestone, Montana

Asymmetric anticline in Cretaceous limestone, SW Montana (220713-2)

Anticlinal hinge, SW Montana

Anticlinal fold hinge in Cretaceous sandstone, SW Montana (220710-13)

Proterozoic Altyn Dolomite, Glacier NP, Montana

Altyn Dolomite, part of the Proterozoic Belt Supergroup, Glacier National Park, Montana (190718-9)

Dipping Paleozoic and Mesozoic rock, SW Montana

Ridges of dipping Paleozoic and Mesozoic sedimentary rock, SW Montana (190711-14)

Fault-propagation fold, Montana

Fault-propagation anticline and thrust fault, Glacier National Park, Montana (220720-10)

Pluvial Lake: Upper Alkali Lake, NE California

Aerial view of Upper Alkali Lake and its alkali deposits, a pluvial lake in NE California, USA. View towards the northeast. (190925-258)

Basalt capped mesa: N Table Mt, Golden, CO

Aerial view of a basalt-capped mesa, North Table Mountain, Golden, Colorado. The basalt erupted 62-64 Ma during the early Paleocene. Beneath the flows lie late Cretaceous-Paleocene rocks of the Denver Formation. (190925-134)

Rhyolite domes of Mono Craters, CA (vertical).

Aerial view of rhyolite domes of the Mono Craters, California. The large middle one is Obsidian Dome; the farthest back is Wilson Butte. (191106-30)

Meandering River in California’s Great Valley (vertical)

Aerial view of the San Joaquin River and its meanders in the Great Valley of California near Modesto, California (191106-45)