The geographic distribution of the Early Permian Midcontinent-Andean fusulinacean faunal realm and the regional histories with similar depositional and tectonic patterns indicate that the Ouachita-Marathon geosyncline was adjacent to Colombia and Venezuela during the collision of North and South America. The age relationships of folding, thrust faulting, and metamorphism show that this collision was completed from east to west during latest Pennsylvanian to Early Permian time.

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