Abstract

The Kayenta Formation near Moab, Utah, contains four normal and four reversed intervals of polarity. These eight polarity intervals occur in approximately 100 m of medium- to finegrained sediment. Because this type of sediment may indicate more rapid deposition, it appears that polarity changes were more frequent in Late Triassic time than in the Early Triassic. The mean pole for the Kayenta Formation is lat 61.9° N., long 74.4° E. (δp = 3.7°, δm = 7.1°), and lies on the western edge of other published Triassic poles. Poles for individual polarity zones are distributed in elongate fashion on a great circle, similar to distributions observed in other Triassic formations. This may indicate a long-term variation of the pole during Triassic time.

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