
Geologic History • Precambrian Era Vulcanism Fault Ancient Sea Igneous Rock
Geologic History • Paleozoic Era Erosion Erosion Sediments Sediments Igneous Rock
Geologic History • Mesozoic Era Erosion Sediments Sediments Igneous Rock Mountains Forming
Geologic History • Cenozoic Era Sedimentary Mountains Eroding Mountains Forming Sedimentary Plains APPALACHIAN MOUNTAINS PACIFIC OCEAN ROCKY MOUNTAINS Igneous Rock ATLANTIC OCEAN INTERIOR PLAINS CANADIAN SHIELD