Buen Formation

The Buen Formation in Peary Land, North Greenland, is an Early Cambrian geologic formation and exceptional fossil deposit preserving life from about 520 to 513 million years ago. Part of the southern shelf succession of the Franklinian Basin, it records ancient marine environments from shelf to slope settings at a time when Greenland lay much farther south. In southern Peary Land it is about 325 metres thick, with a lower sand-rich member beneath darker mudstones and siltstones; farther north it thickens and becomes more mud-rich. Its fossils, especially those associated with Sirius Passet, have been crucial for understanding early animal evolution and the rapid diversification of Cambrian life.

Nationalparken · Greenland