Abstract
Analyses for δ 34S of 13 bedded, marine anhydrite samples from the “C” anhydrite member of the Red River Formation (Upper Ordovician) in the North Dakota portion of the Williston basin represent an addition of δ 34S data to a portion of the S isotope age curve with few data. Previously published estimates of δ 34S for Upper Ordovician marine sulfates apparently are limited to 4 samples from the Saskatchewan portion of the same basin. An adjusted mean value of +25.5‰ was calculated for all known Upper Ordovician δ 34S determinations. This value is approximately 2 to 3‰ lighter than the previous estimate, which suggests that δ 34S of the world ocean during the Upper Ordovician may have been lighter than previously thought. However, because all δ 34S data are from one sedimentary basin, additional S isotopic data from several globally-distributed evaporite basins are needed to evaluate this hypothesis and further constrain δ 34S for the Upper Ordovician. Similar re-examination of other portions of the S isotope age curve with limited amounts of data may increase our understanding of the secular variation in δ 34S .
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