Fortunian

The Fortunium is in the Earth's lower stratigraphic level of Terreneuvium series and the Cambrian system. The stage begins geochronological about 541 million years ago; the upper limit is about 529 million years. The Fortunium is overlaid by a yet unnamed stage ( "Stage 2" ) of the Cambrian. It follows the Ediacaran system of Neoproterozoic Ärathems ( " Precambrian "). This is not divided into series or stages.

Naming and history

The series was named after the place Fortune Head, located near which the GSSP, named.

Definition and GSSP

The beginning of the Fortuniums (and thus also the Terreneuvium series and the Cambrian and Paleozoic and the Phanerozoic at all) was the first appearance of the trace fossil Treptichnus ( Phycodes ) pedum defined. In addition, the limit is also very close to a negative carbon isotope anomaly. As the GSSP Fortunium stage ( and the Terreneuvium series and the Cambrian system) a profile at Fortune Head, Burin Peninsula, Newfoundland (Canada) was determined. However, this limit is still controversial, because T. pedum trace fossils were also subsequently found in two other layers below the current limit ( 3 m and 4 m below the limit ), and Treptichnus sp. Trace fossils were also found deeper.

The limit has not yet been determined.