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We examined the Sr-isotopic composition of one species of well-preserved brachiopod species from the mid-Cincinnatian (Upper Katian–Lower Hirnantian, Upper Ordovician) in closely spaced samples from one borehole on the western shelf of the Upper Ordovician Appalachian low latitude retroarc basin in southwestern Ontario. The section spans the transition from passive margin carbonate ramp through anoxic...
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