Recent O isotopic data collected from brachiopods in Iowa, Missouri, and Manitoba provide data for comparison with our MS trends. Two small positive excursions in the Upper disparilis zone and MN zone 2 appear to coincide with Sequences 1 and 2 in the Flume Formation. A broad minor positive excursion from MN 9 through 11 corresponds to the major MS increase in the uppermost Perdrix and Mount Hawk (Sequences 6 and 7). A small positive ¹⁸O excursion in zones 12-13 appears to coincide with upper Sequence 7 and 8. Positive excursion near the F-F boundary coincides with MS increase in uppermost Ronde/Simla and lower Sassenach.