Global Stratotype Section and Point for base of the Ordovician System

The Global Stratotype Section and Point for base of the Ordovician System and base of the lowest Ordovician stage (Tremadocian) is exposed in the coastal platform at Green Point, western Newfoundland, at the 101.8 m level, within Bed 23, in the measured section (Lower Broom Point Member, Green Point Formation), coinciding with the first appearance of the conodont Iapetognathus fluctivagus Nicoll, Miller, Nowlan, Repetski and Ethington, 1999, and 4.8 m below the earliest planktic graptolites.