Ritoque Formation

Ritoque Formation
Stratigraphic range: Early Hauterivian
~132–128 Ma

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Ritoque Formation; Stratigraphic range: Early Hauterivian; ~132–128 Ma PreЄ Є O S D C P T J K Pg N ↓
Type	Geological formation
Underlies	Paja Formation
Overlies	Rosablanca Fm., Arcabuco Fm.
Thickness	70–110 m (230–360 ft)
Lithology
Primary	Siltstone
Other	Limestone
Location
Coordinates	4°27′07″N 74°03′20″W / 4.45194°N 74.05556°WCoordinates: 4°27′07″N 74°03′20″W / 4.45194°N 74.05556°W
Region	Altiplano Cundiboyacense; Eastern Ranges, Andes
Country	Colombia
Type section
Named for	Vereda Ritoque, Villa de Leyva
Named by	Etayo
Location	Villa de Leyva
Year defined	1968
Coordinates	4°27′07″N 74°03′20″W / 4.45194°N 74.05556°W
Region	Boyacá, Santander
Country	Colombia

The Ritoque Formation (Spanish: Formación Ritoque, Kiri, Kirt) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of grey siltstones, limestones and fine sandstones intercalated. The formation dates to the Early Cretaceous period; Early Hauterivian epoch and varies in thickness between 70 and 110 metres (230 and 360 ft).

Definition

The formation was first defined and named by Etayo in 1968 after the vereda Ritoque of Villa de Leyva.^[1]

Description

Lithologies

The Ritoque Formation is characterised by a sequence of grey siltstones, limestones and sandstones with a thickness between 70 and 110 metres (230 and 360 ft).^[1]

Stratigraphy and depositional environment

The Ritoque Formation overlies the Rosablanca and Arcabuco Formations and is overlain by the Paja Formation. The age has been estimated to be Early Hauterivian. Stratigraphically, the formation is time equivalent with the Macanal Formation.^[2]

Outcrops

Type locality of the Ritoque Formation on the Altiplano Cundiboyacense

The Ritoque Formation is found, apart from its type locality near Villa de Leyva, Boyacá, found in the vicinity.

Regional correlations

Cretaceous stratigraphy of the central Colombian Eastern Ranges
Age	VMM	Guaduas-Vélez		W Emerald Belt		Villeta anticlinal		Chiquinquirá- Arcabuco	Tunja- Duitama	Altiplano Cundiboyacense		El Cocuy
Maastrichtian	Umir Fm.	Córdoba Fm.		Seca Fm.		eroded		Guadalupe Gp.				Colón-Mito Juan Fm.
Maastrichtian				Umir Fm.
Campanian				Córdoba Fm.
Campanian				Oliní Gp.
Santonian	La Luna Fm.	Cimarrona Fm. - La Tabla Fm.										La Luna Fm.
Coniacian		Oliní Gp.				Villeta Gp	Conejo Fm.		Chipaque Fm.
Coniacian		Güagüaquí Gp	Loma Gorda Fm.	undefined			La Frontera Fm.
Turonian		Güagüaquí Gp	Hondita Fm.	La Frontera Fm.	Otanche Fm.		La Frontera Fm.
Cenomanian	Simití Fm.	hiatus		La Corona Gb.			Simijaca Fm.					Capacho Fm.
Cenomanian				Pacho Fm.			Hiló Fm. - Pacho Fm.	Churuvita Fm.	Une Fm.			Aguardiente Fm.
Albian				Hiló Fm.			Hiló Fm. - Pacho Fm.	Chiquinquirá Sst.	Tibasosa Fm.	Une Fm.		Aguardiente Fm.
Albian	Tablazo Fm.			Tablazo Fm.			Capotes Fm. - La Palma Fm. - Simití Fm.	Simití Fm.		Une Fm.		Tibú-Mercedes Fm.
Aptian	Tablazo Fm.			Capotes Fm.			Socotá Fm. - El Peñón Fm.	Paja Fm.		Fómeque Fm.		Tibú-Mercedes Fm.
	Paja Fm.			Paja Fm.	El Peñón Fm.		Trincheras Fm.					Río Negro Fm.
						La Naveta Fm.
Barremian
Hauterivian					Muzo Fm.					Cáqueza Gp	Las Juntas Fm.
Hauterivian	Rosablanca Fm.				Muzo Fm.			Ritoque Fm.			Las Juntas Fm.
Valanginian				Ritoque Fm.	Furatena Fm.	Útica Fm. - Murca Fm.		Rosablanca Fm.	Girón Fm.		Macanal Fm.
Valanginian				Rosablanca Fm.	Furatena Fm.			Rosablanca Fm.			Macanal Fm.
Berriasian	Cumbre Fm.			Cumbre Fm.				Los Medios Fm.			Guavio Fm.
Berriasian	Tambor Fm.			Arcabuco Fm.				Cumbre Fm.			Guavio Fm.
Sources

References

1 2 Galvis & Valencia, 2009, p.10
↑ Galvis & Valencia, 2009, p.17

Bibliography

Galvis Arenas, Beatriz Elena, and José Leonardo Valencia Escobar. 2009. Contribución en la determinación de los posibles paleoambientes de las rocas Cretáceas Tempranas sobre la vía Tunja-Villa de Leyva (entre Alto del Arrayán - Peaje Sáchica) y sectores aledaños, departamento de Boyacá, 1–127. Universidad de Caldas.
Gómez Cruz, Arley de Jesús; Hermann D. Bermúdez, and Francisco J. Vega. 2015. A new species of Diaulax Bell, 1863 (Brachyura: Dialucidae) in the Early Cretaceous of the Rosablanca Formation, Colombia. Boletín de la Sociedad Geológica Mexicana 67. 103-112. Accessed 2017-04-04.
Villamil, Tomas. 2012. Chronology Relative Sea Level History and a New Sequence Stratigraphic Model for Basinal Cretaceous Facies of Colombia, 161–216. Society for Sedimentary Geology (SEPM).

Maps

Pulido González, Orlando. 2009. Plancha 151 - Charalá - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
Ulloa, Carlos E, and Erasmo Rodríguez. 2009. Plancha 170 - Vélez - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
Renzoni, Giancarlo, and Humberto Rosas. 2009. Plancha 171 - Duitama - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
Fuquen M., Jaime A, and José F. Osorno M. 2009. Plancha 190 - Chiquinquirá - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.
Renzoni, Giancarlo; Humberto Rosas, and Fernando Etayo Serna. 1998. Plancha 191 - Tunja - 1:100,000, 1. INGEOMINAS. Accessed 2017-06-06.

External links

Gómez, J.; N.E. Montes; Á. Nivia, and H. Diederix. 2015. Plancha 5-09 del Atlas Geológico de Colombia 2015 – escala 1:500,000, 1. Servicio Geológico Colombiano. Accessed 2017-03-16.

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[Galvis2009_p10-1] 1 2 Galvis & Valencia, 2009, p.10

[Galvis2009_p17-2] Galvis & Valencia, 2009, p.17