Quebrada Marquesa Formation

Quebrada Marquesa Formation (Spanish: Formación Quebrada Marquesa) is a geological formation composed of alternations of volcanic and volcaniclastic rock layers and mostly continental (as opposed to marine) sedimanry rocks in inland Coquimbo Region, northern Chile.^[1] Its does however have a few layers of marine sedimentary rock near its base.^[1] It overlies the older Arqueros Formation wth which it has some interdigitation.^[2] Quebrada Marquesa Formation contains economically valuable manganese layers in its upper half.^[2][3] The formation has a stratigraphic thickness of about 1500 m.^[4]

Quebrada Marquesa Formation
Stratigraphic range: Barremian-Albian
Type	Geological formation
Overlies	Arqueros Formation
Thickness	1500 m
Lithology
Primary	Porphyritic andesite, tuff, limestone, volcanic sandstone, calcareous sandstone
Other	Conglomerate, manganese deposits
Location
Coordinates	24°1′51.70″S 68°11′44.79″W
Region	Coquimbo Region
Country	Chile
Quebrada Marquesa Formation (Chile)