Date post: | 16-Dec-2015 |
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THEMES• Mesozoic paleogeography
– Mostly we’ll see Triassic and Jurassic rocks
• Non-marine paleoenvironments• Surface processes
Paleogeography• Late Permian– Pangea [Utah at the far limit]– Locally ~quiet tectonically– Extreme environments– shallow marine &– eolian sediments
Dott and Prothero
Permian limestoneCutler ~ Kaibab
[eolian sediments below~Coconino, other units in Canyonlands and Arches]
Permo-Triassic boundary in Capitol Reef National Park
Triassic fluvial & playa sedimentsMoenkopi
• Triassic– Beginning westward plate motion
• but no real evidence where we’ll be
– Fluvial, playa & eolian sediments– Petrified forest
Dott and Prothero
Chinle [petrified forest, painted desert]fluvial and paleosols
Upper Triassic fluvial and eolian
Shinarump [basal Chinle]coarse fluvial conglomerate
Moenkopi
• Jurassic– Plate tectonic setting similar to Triassic– Sea level beginning to rise globally– Mostly TONS OF eolian sediments– Some shallow-marine incursions– Famous dinosaur localities
• [but we won’t see them]
Dott and Prothero
• Cretaceous– Sevier orogeny—major thrusting, uplift to west– Cretaceous interior seaway in North America– Fluvial sediments to west, marine to east– Deltas and coal deposits– Non-marine and marine reptiles
Dott & Prothero
Cretaceous shallow-marine sediments near Price, Utah
Cretaceous deltaic sediments "Book Cliffs" Utah
2007 UW ESS spring break field trip to southern Utah
Waterpocket monocline, Capitol Reef National Park