Quebrada Marquesa Formation
Geological formation in northern Chile
From Wikipedia, the free encyclopedia
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]
OverliesArqueros Formation
Thickness1500 m
PrimaryPorphyritic andesite, tuff, limestone, volcanic sandstone, calcareous sandstone
| 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) | |