Moenkopi Formation

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. Part of the Colorado Plateau and Basin and Range, this red sandstone was laid down in the Lower Triassic and possibly part of the Middle Triassic, around 240 million years ago.

Moenkopi Formation
Stratigraphic range:
Moenkopi at its reference section along the Little Colorado River west of Cameron, Arizona
TypeGeological formation
Sub-unitsSee "Members" section
UnderliesChinle Formation
OverliesKaibab Limestone
Lithology
PrimarySandstone
OtherShale
Location
Coordinates35.918°N 111.489°W / 35.918; -111.489
RegionNorthern Arizona
Southeast California
East-central Nevada
Southern Utah
Northwestern New Mexico
Southwestern Colorado
CountrySouthwestern United States
Type section
Named forMoenkopi Wash
Named byWard
Year defined1901
Moenkopi Formation (the United States)
Moenkopi Formation (Arizona)
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