| Buen Formation | |
|---|---|
| Stratigraphic range:Cambrian Series 2 (Atdabanian) ~520–513 Ma | |
| 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′N33°48′W / 83.1°N 33.8°W /83.1; -33.8 |
| Approximate paleocoordinates | 22°06′S49°00′W / 22.1°S 49.0°W /-22.1; -49.0 |
| Region | Peary Land |
| Country | Greenland |
| Extent | Franklinian Basin |
| Type section | |
| Location | SouthernPeary Land |
  Buen Formation (Greenland) | |
TheBuen Formation is ageologic formation andLagerstätte inPeary Land, NorthGreenland. Theshale preservesfossils dating back to theEarly Cambrianperiod (Atdabanian in the local timescale, about 520 to 513 Ma).[1]
The oldest Cambrian series of the area was deposited in theFranklinian Basin and is poorly exposed in fragmentary, heavily metamorphosed outcrops inPeary Land. It was emplaced during theEllesmerian 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 southernPeary 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 thePolkorridoren 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 underlyingPortfjeld Formation, and to the north with bioturbated mudstones and sandstones of the Buen Formation.[4]
The following fossils have been reported from the formation:[1]
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