Bandelier Tuff

Bandelier Tuff
Stratigraphic range: Pleistocene, 1.85–1.256 Ma
Kwage Mesa, a typical finger mesa eroded out of the Bandelier Tuff in the Pajarito Plateau
TypeGeologic formation
Unit ofTewa Group
Sub-unitsLa Cueva Member, Otowi Member, Tshirege Member
OverliesTschicoma Formation, Paliza Canyon Formation
Thickness330 m (1,080 ft)
Lithology
PrimaryIgnimbrite
OtherPumice
Location
Coordinates35°45′50″N 106°19′19″W / 35.764°N 106.322°W / 35.764; -106.322
Region New Mexico
Country United States
Type section
Named forBandelier National Monument
Named byHarold T.U. Smith
Year defined1938

Map of Bandelier Tuff exposures

The Bandelier Tuff is a geologic formation exposed in and around the Jemez Mountains of northern New Mexico. It has a radiometric age of 1.85 to 1.25 million years, corresponding to the Pleistocene epoch. The tuff was erupted in a series of at least three caldera eruptions in the central Jemez Mountains.

The Bandelier Tuff was one of the first ignimbrites recognized in the geologic record, and has been extensively studied by geologists seeking to understand the processes involved in volcanic supereruptions.