By Stanley Charles Finney, William B. N. Berry (editors)
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Additional info for The Ordovician Earth System
Whereas Turinian strata of eastern North America contain abundant warm-water carbonates, the Lower Chatfieldian marks a shift to cool-water carbonates, an increase in siliciclastic influx, and phosphatic sediments. Numerical modeling results show that global cooling had a major impact on sea surface temperatures in the shallow epicontinental sea of Laurentia during the Late Ordovician. The presence of cold-water masses that originated in the higher latitudes and were brought toward the southern and eastern margins of Laurentia could have led to the observed stratigraphic changes.
Ackerly et al. (1993) correlate the number of punctae in Paucicrura rogata with water depth and temperature, and showed that water temperature increased with depth. However, dysoxic conditions within the foreland basin may have contributed to reduced growth rates of brachiopods. Dysoxic conditions would have increased the packing density of punctae per unit area, and therefore packing densities would not have been a good predictor for any depthdependent temperature variations. The cold-water conditions would have existed in the epicontinental sea of Laurentia despite high pCO2 values of 15× preindustrial levels.
284, p. 1016/S0040-1951(97)00186-8. , 1998, Palaeozoic of the Barrandian (Cambrian to Devonian): Prague, Czech Geological Survey, 183 p. , 2005, Baltica from the late Precambrian to midPaleozoic times: The gain and loss of a terrane’s identity: Earth-Science Reviews, v. 72, p. 001. , 1992, Paleozoic metabentonites of North America: Part 3—New Ordovician metabentonites from Kentucky and Tennessee: University of Louisville Studies in Paleontology and Stratigraphy, v. 20, p. 1–30. S. Geological Survey Professional Paper 768, 61 p.