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Ancha Formation information


Ancha Formation
Stratigraphic range: Pleistocene, 3.5–1 Ma
PreꞒ
O
S
D
C
P
T
J
K
Pg
N
Ancha Formation at type section
TypeFormation
Unit ofSanta Fe Group
OverliesTesuque Formation
Thickness28 m (92 ft)
Lithology
PrimarySandstone
OtherSiltstone, conglomerate
Location
Coordinates35°44′54″N 106°06′40″W / 35.74834°N 106.11108°W / 35.74834; -106.11108
RegionNew Mexico
CountryAncha Formation United States
Type section
Named forCanada Ancha
Named byBaltz et al.
Year defined1952
Ancha Formation is located in the United States
Ancha Formation
Ancha Formation (the United States)
Ancha Formation is located in New Mexico
Ancha Formation
Ancha Formation (New Mexico)

The Ancha Formation is a geologic formation found near Santa Fe, New Mexico. It is estimated to be between 1 and 3 million years in age, corresponding to the late Pliocene and Pleistocene.[1]

Study of the formation has provided clues on the development of rivers systems in the region. In particular, evidence from the formation suggests that the Pecos River may originally have flowed west to join the Santa Fe River, rather than east to join the Rio Grande as it now does.

The formation is one of the youngest of the Santa Fe Group formations deposited in the Rio Grande rift. It is an important local aquifer.[1]

  1. ^ a b Koning et al. 2002.

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