Macarao Formation
The Macarao Formation is a geological formation of the Cocinetas Basin in the northernmost Colombian department of La Guajira. The formation consists of foraminifera-rich fine to medium grained calcareous sandstones intercalated with calcareous siltstones, cross-cut by veins of gypsum. The thick Macarao Formation dates to the Paleogene period; Middle to Late Eocene epoch, corresponding to the Divisaderan in the South American land [mammal age]s.
Definition
The formation was defined by Rollins in 1965.Description
Lithologies
The Macarao Formation consists of foraminifera-rich fine to medium grained calcareous sandstones intercalated with calcareous siltstones, cross-cut by veins of gypsum.Stratigraphy and depositional environment
The Macarao Formation has a maximum thickness of and overlies the Cretaceous Guaramalai Formation and the basement and is overlain by the Siamaná and Castilletes Formations with a high angle unconformity. The age has been estimated to be Middle to Late Eocene, corresponding to the Divisaderan in the South American land mammal ages. The formation has been deposited in a shallow marine bay environment.Petroleum geology
The Macarao Formation is a reservoir rock formation in the Guajira Basin.Maps
Category:Paleogene Colombia
Category:Eocene [Series of South America]
Category:Divisaderan
Category:Bartonian Stage
Category:Priabonian Stage
Category:Sandstone formations
Category:Siltstone formations
Category:Shallow marine deposits
Category:Reservoir [rock formations]
Category:Paleontology in Colombia
La Guajira Department">La Guajira Department">La Guajira Department