Bohío Formation

Bohío Formation
Bohío Formation
Stratigraphic range: Late Eocene-Late Oligocene
Type	Formation
Underlies	Caraba & Caimito Formations
Overlies	Gatuncillo Formation
Thickness	75–450 m (246–1,476 ft)
Lithology
Primary	Sandstone
Other	Siltstone, conglomerate
Location
Coordinates	9°12′N 79°54′W / 9.2°N 79.9°W
Approximate paleocoordinates	7°42′N 77°30′W / 7.7°N 77.5°W
Region	Colón Province
Country	Panama
Extent	Panama Basin
	Bohío Formation (Panama)

The Bohío Formation (Tbo, Tbm)^[1] is a geologic formation in Panama. It preserves fossils dating back to the Late Eocene to Late Oligocene period.^[2]

Description

The Bohío Formation is characterized by the presence of poorly sorted debris, mostly basaltic: very coarse debris in the form of boulders and cobbles, and finer debris forming beds of sandstone, and the matrix of conglomerate. The facies are non-marine, but marine fossils are found in thin units in the upper part of the formation, in algal limestone and in both poorly sorted and fairly well sorted subgraywacke. The Bohío Formation overlies the Gatuncillo Formation conformably in most areas, although may lap onto the Gatuncillo Formation or basement.

The thickness of the formation is about 75 to 450 metres (246 to 1,476 ft). Smaller foraminifera from the basal part of the formation yielded an early Oligocene age. The upper part of the formation, from which the collections are derived yields larger foraminifera of late Oligocene age.^[3]