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The Moenkopi Formation is a geological formation that is spread across the U.S. states of New Mexico, northern Arizona, Nevada, southeastern California, eastern Utah and western Colorado. This unit is considered to be a group in Arizona.
The Oracle is set on a fin and is composed of two principal strata of sandstone and mudstone: Permian Cutler Formation capped by Early Triassic Moenkopi Formation. There is an unconformity between the Cutler and the Moenkopi layers. [3] The reddish coloration of the rock is a result of varying amounts of hematite. [4]
In the Capitol Reef area the resulting Moenkopi Formation is divided into four members (from oldest to youngest): [6] Black Dragon Member; Sinbad Limestone Member, Torrey Member, and; Moody Canyon Member. Distinctive exposures of the uppermost Moenkopi are along the lower slopes of the west-facing cliffs of the Waterpocket Fold.
From top to bottom: Rounded tan domes of the Navajo Sandstone, layered red Kayenta Formation, cliff-forming, vertically jointed, red Wingate Sandstone, slope-forming, purplish Chinle Formation, layered, lighter-red Moenkopi Formation, and white, layered Cutler Formation sandstone. Picture from Glen Canyon National Recreation Area, Utah.
Moenkopia (meaning "for Moenkopi") is an extinct genus of prehistoric sarcopterygians from the Coelacanthidae [1] found in the Middle Triassic Moenkopi Formation of Arizona.The type, and only species, M. wellesi, was named in 1961 in honour of Samuel Paul Welles. [2]
The Shinarump was laid down in braided streams that flowed through valleys eroded into the underlying Moenkopi Formation. [8] This member of the Chinle forms prominent cliffs with thickness up to 200 feet (60 m), and its name comes from a Native American word meaning "wolf's rump" (a reference to the way this member erodes into gray, rounded ...
The UK's biggest ever dinosaur trackway site has been discovered in a quarry in Oxfordshire. About 200 huge footprints, which were made 166 million years ago, criss-cross the limestone floor.
F. E. Peabody argued that the "horseshoe-like" impressions reported from the Moenkopi Formation were actually "current crescents". [64] 1948. Norbert Casteret reported the presence of Pleistocene hyena tracks in the Aldene cave of France. [65] F. E. Peabody published a study of the amphibian and reptile tracks preserved in the Triassic Moenkopi ...