Figure 3.
Pleistocene North American drainage. Continental ice sheets turn Montana drainage into modern Missouri. Yellowstone hotspot track has cut off Miocene River. Faulting in SE Nevada has diverted Colorado River to Gulf of California. HB—Hudson Bay; HS—Hudson Strait; NAMC—North Atlantic Mid-Ocean Channel; SRP—Snake River Plain, S SASK—South Saskatchewan River; YHS—Yellowstone hotspot.