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Figure 7.3 Precambrian geology of the northern Mississippi River valley (from Van Schmus et al .,
2007 ) . BE, Becker Embayment; CB, Cheyenne Belt; CI, Croker Island complex; EP, Eau Pleine shear
zone; G-R, granite-rhyolite province; K, Killarney magmatic complex; MI, Manitoulin Island; MRV,
Minnesota River Valley terrane promontory; MT, Marshfield terrane; NF, Niagara Fault; SLtz, Spirit
Lake tectonic zone; WC, Wyoming craton. Line points to Reelfoot Rift (RR).
 
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