Earth:Usme Formation

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Short description: Geological formation in the Colombian Andes
Usme Formation
Stratigraphic range: Late Eocene-Early Oligocene
~40–30 Ma
TypeGeological formation
UnderliesTilatá Formation
OverliesRegadera Formation
Thicknessup to 300 m (980 ft)
Lithology
PrimaryShale, sandstone, conglomerate
Location
Coordinates [ ⚑ ] : 4°21′40.3″N 74°07′50″W / 4.361194°N 74.13056°W / 4.361194; -74.13056
RegionBogotá savanna, Altiplano Cundiboyacense
Eastern Ranges, Andes
Country Colombia
Type section
Named forUsme
Named byHubach
LocationUsme, Bogotá
Year defined1957
Coordinates [ ⚑ ] 4°21′40.3″N 74°07′50″W / 4.361194°N 74.13056°W / 4.361194; -74.13056
RegionCundinamarca
Country Colombia
Blakey 035Ma - COL.jpg
Paleogeography of Northern South America
35 Ma, by Ron Blakey

The Usme Formation (Spanish: Formación Usme, Tsu, Teu) is a geological formation of the Bogotá savanna, Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of a lower part with predominantly shales with intercalated sandstone beds and an upper sequence with sandstones and conglomerates. The Usme Formation dates to the Neogene and Paleogene periods; Late Eocene to Early Oligocene epochs, and has a maximum thickness of 300 metres (980 ft).

Etymology

The formation was defined by Hubach in 1957 and named after the locality of Usme, Bogotá.[1]

Description

Lithologies

The Usme Formation is subdivided into a lower sequence of shales with intercalated sandstones and an upper part of sandstones and conglomerates.[1]

Stratigraphy and depositional environment

The Usme Formation unconformably overlies the Regadera Formation and is overlain by the Tilatá Formation.[2] The age has been estimated, based on palynological data, to be Late Eocene to Early Oligocene.[1] The depositional environment has been interpreted as marine with the upper part deposited in a deltaic setting.[3]

Outcrops

Lua error in Module:Location_map at line 522: Unable to find the specified location map definition: "Module:Location map/data/Bogotá savanna" does not exist. The Usme Formation is found in its type locality in the synclinal of Usme, the valley of the Tunjuelo River.[1]

Regional correlations

See also

Featured article candidate Geology of the Eastern Hills
B-Class article Geology of the Ocetá Páramo
C-Class article Geology of the Altiplano Cundiboyacense

Notes and references

Notes

References

  1. 1.0 1.1 1.2 1.3 Montoya & Reyes, 2005, p.65
  2. Guerrero Uscátegui, 1992, p.6
  3. Bayona et al., 2010, p.7

Bibliography

Maps

External links