The Stratigraphic Position of the 33-33r (Campanian) Polarity Chron Boundary in Southeastern Alberta

Magnetostratigraphic analysis was carried out on middle to lower Campanian strata of the Foremost and Pakowki formations in the Milk River area of southeastern Alberta to determine the position of the 33-33r polarity boundary. This magnetozone boundary is essentially at the Pakowki-Foremost formational contact on the eastern side of the Sweetgrass Arch (Long. approx. 111°), and occurs within the Baculites asperiformis ammonite zone of the...