Fortunian
Period
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The Fortunian age marks the beginning of the Phanerozoic Eon, the Paleozoic Era, and the Cambrian Period. It is the first of the two stages of the Terreneuvian series. Its base is defined as the first appearance of the trace fossil Treptichnus... Wikipedia
Epoch: Terreneuvian
Occurred: 541 (+/- 1) million years ago - 529 million years ago
Lower boundary definition: Appearance of the Ichnofossil Treptichnus pedum
Lower boundary GSSP: Fortune Head section, Newfoundland, Canada; 47°04′34″N 55°49′52″W / 47.0762°N 55.8310°W
Lower GSSP ratified: 2007 (as base of Terreneuvian and Fortunian)
Upper boundary definition candidates: First appearance of small shelly fauna or Archaeocyathids