Toarcian

Geologic period

Occurred: 182.7 (+/- 0.7) million years ago - 174.1 (+/- 1) million years ago

Lower boundary definition: Peniche, Portugal

Lower boundary GSSP: FAD of the Ammonite D. (E.) simplex; 39°22′15″N 9°23′07″W / 39.3708°N 9.3853°W

Lower GSSP ratified: 2014

Upper boundary definition: FAD of the Ammonites Leioceras opalinum and Leioceras lineatum

Organisms