The Siamaná Formation (, E3s) is a fossiliferous geological formation of the Cocinetas Basin in the northernmost department of La Guajira. The formation consists of conglomerates and limestones. The Siamaná Formation dates to the Paleogene period; Middle to Late Oligocene epoch, corresponding to the Deseadan in the SALMA classification.
Etymology The formation was defined by Renz in 1960 and named after the village of Siamaná.Moreno et al., 2015, p.7
Description Lithologies The Siamaná Formation consists of conglomerates and thick carbonates.Hendy et al., 2015, p.47
Stratigraphy and depositional environment The Siamaná Formation, with a maximum thickness of , overlies the Macarao Formation and is overlain by the Uitpa Formation. The age has been estimated to be Middle to Late Oligocene, corresponding to the Deseadan in the SALMA classification. The depositional environment has been interpreted as shallow marine.Rodríguez & Londoño, 2002, p.132
Petroleum geology The Siamaná Formation is a reservoir and seal rock formation in the Guajira Basin.ANH, 2010
Fossil content Group Fossils Notes Invertebrates Mimachlamys canalis, Ostrea sp.
See also
Geology of the Eastern Hills Cesar-Ranchería Basin Honda Group Abanico, Castillo, Chota, Loreto, Soncco, Usme Formations Tinguiririca fauna
References
Bibliography Local geology
Paleontology
Maps