Page 126 - Carbonate Facies in Geologic History

Evidence Determining Trends, Paleocurrents, and Wind Directions 113

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Fig.IV-It Thickness variations within Middle Silurian carbonate of Michigan basin. From
Mesolella et al. (1974, Fig. 2). Contour interval is lOOfeet. Thick dolomitized carbonates
associated with barrier-reef complex at basin margins grade basinward into thinner non-reef
limestones. The facies transition is characterized by many hydrocarbon-bearing pinnacle
reefs, i.e., offshore mounds and small banks. Illustration courtesy of author and American
Association of Petroleum Geologists