Buen Formation
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| Buen Formation | |
|---|---|
| Stratigraphic range: Cambrian Series 2 (Atdabanian) ~ | |
| Type | Formation |
| Unit of | Sirius Passet |
| Sub-units | Upper & lower members |
| Underlies | Hans Tavsen icecap |
| Overlies | Portfjeld Formation |
| Thickness | Up to 700 m (2,300 ft) |
| Lithology | |
| Primary | Mudstone |
| Other | Sandstone, shale |
| Location | |
| Coordinates | 83°06′N 33°48′W / 83.1°N 33.8°W |
| Approximate paleocoordinates | 22°06′S 49°00′W / 22.1°S 49.0°W |
| Region | Peary Land |
| Country | Greenland |
| Extent | Franklinian Basin |
| Type section | |
| Location | Southern Peary Land |
  Buen Formation (Greenland) | |
The Buen Formation is a geologic formation and Lagerstätte in Peary Land, North Greenland. The shale preserves fossils dating back to the Early Cambrian period (Atdabanian in the local timescale, about 520 to 513 Ma).[1]
Paleogeography
The oldest Cambrian series of the area was deposited in the Franklinian Basin and is poorly exposed in fragmentary, heavily metamorphosed outcrops in Peary Land. It was emplaced during the Ellesmerian orogeny.[2][3]
During the Cambrian, Greenland was located in the southern tropical to temperate region. The Buen Formation forms part of the southern shelf succession of the Franklinian Basin of North Greenland and the Canadian Arctic Islands. The formation, approximately 325 metres (1,066 ft) thick, consists of a lower, sand−dominated, member overlain by an upper member dominated by dark grey−green mudstones and siltstones in its type area in southern Peary Land. It thickens to around 700 metres (2,300 ft) in northern Peary Land where it comprises a mud−rich transitional succession into deep water trough deposits of the Polkorridoren Group. Dark grey to black mudstones form part of this transitional succession from the shelf to the slope. To the south they lie in faulted contact with pale dolomites of the underlying Portfjeld Formation, and to the north with bioturbated mudstones and sandstones of the Buen Formation.[4]
Fossil content
The following fossils have been reported from the formation:[1]
