Entrada Sandstone
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The Entrada Sandstone is a formation in the San Rafael Group found in the U.S. states of Wyoming, Colorado, northwest New Mexico, northeast Arizona, and southeast Utah. Part of the Colorado Plateau, this formation was deposited during the Jurassic Period sometime between 180 and 140 million years ago in various environments, including tidal mudflats, beaches, and sand dunes. The Middle Jurassic San Rafael Group was dominantly deposited as ergs in a desert environment around the shallow Sundance Sea.
Type of the Entrada Formation at Entrada Point, Emery County, Utah
Entrada Sandstone conformably overlies the Carmel Formation, Park Avenue, Arches National Park
Entrada Sandstone at Red Wash Canyon, near Abiquiu, New Mexico
The Three Gossips in Arches National Park
Carmel Formation
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The Carmel Formation is a geologic formation in the San Rafael Group that is spread across the U.S. states of Wyoming, Utah, Colorado, north east Arizona and New Mexico. Part of the Colorado Plateau, this formation was laid down in the Middle Jurassic during the late Bajocian, through the Bathonian and into the early Callovian stages.
Carmel Formation exposed at Gunlock Reservoir, southwestern Utah
Carmel Formation near Gunlock, Utah. The unconformably overlying dark unit is the Upper Cretaceous Iron Springs Formation.
The Golden Throne, a rock formation in Capitol Reef National Park. Though the park is famous for white domes of the Navajo Sandstone, this dome's color is a result of a lingering section of yellow Carmel Formation carbonate, which has stained the underlying rock.
Cross-section of a carbonate hardground encrusted by oysters and bored by bivalves (Gastrochaenolites)