Exposure: Within the Grand Staircase, the Carmel Formation is best exposed in east of Capital Reef National Park just south of Goblin Valley State Park. Age: Middle Jurassic, 160 Ma Depositional Environment: Full marine, shallow marine to sabkha (and supratidal) Paleogeography: Frequent, but short-lived sea level fluctuations during the Middle to Late Jurassic caused periodically flooding […]
Exposure: Without a doubt the most striking exposures of the Entrada Formation are in Arches National Park. Other great exposures exist in Canyonlands, Goblin Valley State Park and Lake Powell NRA. Age: Upper Jurassic, 80 and 140 ma Depositional Environment: Eolian, sabkha, and tidal flat. The Entrada Sandstone preserves terrestrial environments. Within the field trip area, the deposits […]
Exposure: Within the Grand Staircase, the Curtis Formation is best exposed in east of Capital Reef National Park just south of Goblin Valley State Park. Age: Deposited from early to late Oxfordian time (161 – 155 Ma) (Wilcox, 2007). Depositional Environment: Marine and marginal-marine tidal flat. Comprises one unconformably-bound, transgressive-regressive (T-R) sequence (Wilcox, 2007). Paleogeography: A major […]
Exposure: Within the Grand Staircase, the Summerville Formation is best exposed in east of Capital Reef National Park just south of Goblin Valley State Park. Age: Deposited Middle Jurassic, early to late Oxfordian time (161 – 155 Ma) (Wilcox, 2007). Depositional Environment: Marginal marine and sabkha/tidal. One unconformably-bound, transgressive-regressive (T-R) sequence, marine (saline lacustrine?) and marginal-marine (Wilcox, […]
Exposure: Within the Grand Staircase, the Morrison Formation is best exposed in Capital Reef National Park. Age: Late Jurassic (Kimmeridgian) 155-148 Ma Depositional Environment: Alluvial plain, fluvial channels and floodplains with paleosols Tectonics: Subduction to the west created a back arc rift basin (between Morrison basin and paleo Pacific Ocean).Mountain ranges (rift shoulder) to the […]
Raise of the Colorado Plateau (33-15 MYA), and Formation of the Colorado River & Grand Canyon Introduction For over two decades, the geologic community has remained locked in a debate regarding the “Old” versus “Young” Colorado River, often missing the forest for the trees. By hyper-focusing on localized datasets—such as the geochemical signatures of the […]
. The Grand Canyon, a mile-deep chasm carved through millennia of Earth’s history, is not merely a spectacle of layered rock; it is a profound archive of ancient life. Within its vibrant strata, beyond the skeletal remains, lie the subtle yet powerful narratives of behavior etched in stone: tracksites and trace fossils. These ichnological treasures, […]
What are Moqui Marbles? Moqui marbles are small, brownish-black balls composed of iron oxide and sandstone that formed underground when iron minerals precipitated from flowing groundwater. They occur in many places in southern Utah either embedded in…
Nestled in south-central Utah is a remote mountain range which epitomizes an entire era of unique volcanism in Utah and was one of the last mountain ranges in the United States to be fully explored and mapped.
The Wasatch Plateau is located south and east of the southernmost part of the Wasatch Range in central Utah and is in the transition zone between the Colorado Plateau and the Basin and Range physiographic provinces.
