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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.
Ancient wave ripple marks in sandstone, Moenkopi Formation, Capitol Reef National Park, Utah. In geology, ripple marks are sedimentary structures (i.e., bedforms of the lower flow regime) and indicate agitation by water (current or waves) or directly by wind.
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 ...
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]
A bedform is a geological feature that develops at the interface of fluid and a moveable bed, the result of bed material being moved by fluid flow. Examples include ripples and dunes on the bed of a river .
The Sinbad Limestone Member was considered a portion of the greater Moenkopi Formation. It was recently elevated to formation rank, as the Sinbad Formation, and referred to the Thaynes Group. [2] The Sinbad Formation is made up of beds of yellowish-gray limestone, dolomite, quartz sandstone, siltstone and, conglomerate rock.
The formation overlies the Hermosa Group [6] and is in turn overlain by either the Dolores Formation (near its type area) [7] or the Moenkopi Formation (further west). [8] It is laterally equivalent to the Abo Formation of central New Mexico, to which it seamlessly transitions in the Jemez Mountains .
An antidune is a bedform found in fluvial and other channeled environments. Antidunes occur in supercritical flow, meaning that the Froude number is greater than 1.0 or the flow velocity exceeds the wave velocity; this is also known as upper flow regime. In antidunes, sediment is deposited on the upstream (stoss) side and eroded from the ...