Hiló Formation

The Hiló Formation (Spanish: Formación Hiló, Kih) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The predominantly shale formation dates to the Middle Cretaceous period; Late Albian to Early Cenomanian epochs and has a measured thickness at its type section of 470 metres (1,540 ft). The fossiliferous formation has provided a great abundance of ammonites and other marine species.

Hiló Formation
Stratigraphic range: Late Albian-Early Cenomanian
~102–98 Ma
↓
TypeGeological formation
Unit ofVilleta Group
UnderliesSimijaca Formation
OverliesCapotes Formation
Thicknessmore than 470 metres (1,540 ft)
Lithology
PrimaryShale
OtherSandstone, limestone, siltstone
Location
Coordinates4°47′28″N 74°30′49″W
RegionAltiplano Cundiboyacense
Eastern Ranges, Andes
Country Colombia
Type section
Named forCaserío Boquerón de Hiló
Named byHubach
LocationApulo-Anapoima
Year defined1931
Coordinates4°47′28″N 74°30′49″W
Approximate paleocoordinates0.6°N 45.3°W / 0.6; -45.3
RegionCundinamarca, Tolima
Country Colombia
Thickness at type section470 m (1,540 ft)

Paleogeography of Northern South America
105 Ma, by Ron Blakey

Etymology

The formation was defined and named in 1931 by Hubach after the Caserío Boquerón de Hiló in Anapoima.[1]

Description

Lithologies

The Hiló Formation with a measured thickness of 470 metres (1,540 ft), is characterised by a sequence of pyritic organic shales, limestones and siltstones, with sandstone banks intercalated in the formation.

Stratigraphy and depositional environment

The Hiló Formation overlies the Capotes Formation and is overlain by the Simijaca Formation. The age has been estimated to be Late Albian to Early Cenomanian. Stratigraphically, the formation is time equivalent with the Une and Pacho Formations.[2] The formation has been deposited in an open platform setting. The deposition is represented by a maximum flooding surface and pelagic to hemipelagic conditions.[1][3]

Fossil content

Fossils of Actinoceramus munsoni, Actinoceramus aff. subsulcatiformis, Beudanticeras cf. rebouli, Desmoceras latidorsatum, Eubrancoceras cf. aegoceratoides, Exogyra aff. texana, Goodhallites aguilerae, Inoceramus anglicus, Inoceramus cf. cadottensis, Inoceramus aff. dunveganensis, Inoceramus aff. etheridgei, Inoceramus cf. ewaldi, Inoceramus aff. irenensis, Inoceramus prefragilis, Inoceramus cf. richensis, Lyelliceras pseudolyelli, Mojsisovicsia evansi, Mortoniceras arietiforme, Neocomiceramus neocomiensis, Neoharpoceras hugardianum, Oxytropidoceras intermedium, Oxytropidoceras karsteni, Oxytropidoceras laraense, Oxytropidoceras multicostatum, Oxytropidoceras nodosum, Oxytropidoceras peruvianum, ?Oxytropidoceras robustum, Oxytropidoceras venezolanum, Prolyelliceras gevreyi, Prolyelliceras prorsocurvatum, Puzio media, Tegoceras mosense, Acompsoceras sp., ?Bositra sp., Camptonectes sp., Entolium sp., Hamites sp., Hysteroceras sp., Mariella sp., Ostrea sp., Phelopteria sp., and ?Syncyclonema sp. have been found in the Hiló Formation.[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]

Outcrops
Type locality of the Hiló Formation to the west of the Bogotá savanna

The Hiló Formation is apart from its type locality along the road from Apulo to Anapoima, found just east of Viotá, Cundinamarca,[26] and in the department of Tolima.[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] West of Guayabal de Síquima, the formation is offset by the Vianí Fault.[27]

Regional correlations
Cretaceous stratigraphy of the central Colombian Eastern Ranges
AgePaleomapVMMGuaduas-VélezW Emerald BeltVilleta anticlinalChiquinquirá-
Arcabuco		Tunja-
Duitama		Altiplano CundiboyacenseEl Cocuy
MaastrichtianUmirCórdobaSecaerodedGuaduasColón-Mito Juan
UmirGuadalupe
CampanianCórdoba
Oliní
SantonianLa LunaCimarrona - La TablaLa Luna
ConiacianOliníConejoChipaque
Güagüaquí
Loma GordaundefinedLa Frontera
TuronianHonditaLa FronteraOtanche
CenomanianSimitíhiatusLa CoronaSimijacaCapacho
Pacho Fm.Hiló - PachoChuruvitaUneAguardiente
AlbianHilóChiquinquiráTibasosaUne
TablazoTablazoCapotes - La Palma - SimitíSimitíTibú-Mercedes
AptianCapotesSocotá - El PeñónPajaFómeque
PajaPajaEl PeñónTrincherasRío Negro
La Naveta
Barremian
HauterivianMuzo
Cáqueza
Las Juntas
RosablancaRitoque
ValanginianRitoqueFuratenaÚtica - MurcaRosablancahiatusMacanal
Rosablanca
BerriasianCumbreCumbreLos MediosGuavio
TamborArcabucoCumbre
Sources

See also
Geology of the Eastern Hills
Geology of the Ocetá Páramo
Geology of the Altiplano Cundiboyacense

References
  1. Acosta & Ulloa, 2002, p.44
  2. Acosta & Ulloa, 2001, p.16
  3. Villamil, 2012, p.164
  4. Olini Creek 1 at Fossilworks.org
  5. Olini Creek 3 at Fossilworks.org
  6. Olini Creek 6 at Fossilworks.org
  7. Olini Creek 8 at Fossilworks.org
  8. Olini Creek 9 at Fossilworks.org
  9. Olini Creek 13 at Fossilworks.org
  10. Olini Creek 15 at Fossilworks.org
  11. Olini Creek 34 at Fossilworks.org
  12. Olini Creek 39 at Fossilworks.org
  13. Olini Creek 40 at Fossilworks.org
  14. Olini Creek 47 at Fossilworks.org
  15. Olini Creek 48 at Fossilworks.org
  16. Olini Creek 54 at Fossilworks.org
  17. Olini Creek 58 at Fossilworks.org
  18. Olini Creek 59 at Fossilworks.org
  19. Olini Creek 65 at Fossilworks.org
  20. Olini Creek 100 at Fossilworks.org
  21. Olini Creek 101 at Fossilworks.org
  22. Olini Creek 106 at Fossilworks.org
  23. Olini Creek 108 at Fossilworks.org
  24. Olini Creek 115 at Fossilworks.org
  25. Olini Creek 122 at Fossilworks.org
  26. Plancha 246, 1998
  27. Plancha 227, 1998

Bibliography

Maps
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