STORMS IN THE LATE PERMIAN AND EARLY TRIASSIC
The predictions can be tested by looking at the frequency and intensity of storms in the geologic record. Preliminary frequency results suggest that although absolute numbers of Permian and Triassic storm deposits are quite low compared to other intervals, a strong Triassic peak results when numbers of deposits are normalized to outcrop area. The Permian normalized value is low, perhaps because of less storm activity in the Early Permian glaciated world. Preliminary data show that Late Permian storms were slightly more frequent than in the Early Permian. The highest frequency of Triassic storm deposits was in the Middle, with the Early and Late being roughly equal. Tests for intensity are problematic. Storm bed thickness might serve as a crude proxy for intensity, but other variables such as sediment availability complicate this. Pebbly storm beds should be particularly conspicuous in the Early Triassic as flat pebbles should have been relatively easy to generate when diminished levels of bioturbation facilitated early cementation of shallow sediment layers that could be ripped up by storms.