Geste Formation
The Geste Formation () is a fossiliferous geologic formation of the Puna Plateau in the western Salta Province and northern Catamarca Province of the Argentine Northwest, northwestern Argentina.

The formation, reaching a thickness of , is the oldest unit of the Pastos Grandes Group, underlying the Pozuelos Formation and unconformably overlying various Paleozoic formations. The Geste Formation comprises red sandstones and conglomerates deposited in a fluvial to alluvial environment. The formation was initially dated to the Mustersan (Middle Eocene), but subsequent research proved the formation to date to the Late Eocene (Divisaderan in the SALMA classification, ranging approximately from 42 to 36 Ma.

The Geste Formation has provided a faunal assemblage of vertebrates unique for the Argentine Northwest, with several groups of mammals, most notably the only Paleogene interatheres of northwestern Argentina, reptiles and frogs. Only partly they correspond to other fossiliferous formations in the area; the upper part of the Lumbrera Formation and the Quebrada de los Colorados Formation.
None
fossiliferous
UNK
Q736917
formation
Concept
Q2310805
Puna Plateau
LOC
Q44803
Salta Province
LOC
Q44756
Catamarca Province
LOC
Q1437320
Argentine Northwest
LOC
Q414
Argentina
LOC
None
Pastos Grandes Group
UNK
None
Pozuelos Formation
UNK
Q876798
unconformably
Concept
Q75507
Paleozoic
LOC
Q13085
sandstone
Concept
Q191704
conglomerates
Concept
Q1434465
fluvial
LOC
Q465088
alluvial
Concept
Q1994702
environment
UNK
Q6943491
Mustersan
TIME
Q76274
Middle Eocene
TIME
Q76274
Late Eocene
TIME
Q5284409
Divisaderan
MISC
Q5817530
SALMA classification
Concept
Q7377
mammal
Concept
Q846089
interatheres
Concept
Q10811
reptile
Concept
None
Lumbrera Formation
UNK
None
Quebrada de los Colorados Formation
UNK
Q85763319
Geste Formation
UNK
Q85763319
Geste Formation
UNK
Q85763319
Geste Formation
UNK
+42^^http://www.w3.org/2001/XMLSchema#decimal
42
NUMBER
+36^^http://www.w3.org/2001/XMLSchema#decimal
36
NUMBER
country
shares border with
country
country
country
instance of