Geodiversity Atlas—Oregon State Index

Each park-specific page in the NPS Geodiversity Atlas provides basic information on the significant geologic features and processes occurring in the park. Links to products from Baseline Geologic and Soil Resources Inventories provide access to maps and reports.

Fort Vancouver National Historic Site lies within the Portland Basin, which began forming approximately 20 million years ago due to the subduction of the Juan de Fuca Plate beneath the North American Plate. The basin’s thick layers of rock and sediment record geologic processes that include voluminous flood basalts, sedimentation, earthquakes, subsidence, and catastrophic ice age floods.

Each park-specific page in the NPS Geodiversity Atlas provides basic information on the significant geologic features and processes occurring in the park. Links to products from Baseline Geologic and Soil Resources Inventories provide access to maps and reports.

Lewis and Clark National Historical Park preserves, restores, and interprets key historical, cultural, scenic, and natural resources throughout the lower Columbia River area associated with the expedition’s arrival and exploration of the Pacific coast. The area’s geology records three major geologic events: the formation of the Cascadia Subduction Zone, the extensive outpouring of Columbia River basalt, and the colossal Glacial Lake Missoula floods.

Each park-specific page in the NPS Geodiversity Atlas provides basic information on the significant geologic features and processes occurring in the park.

Each park-specific page in the NPS Geodiversity Atlas provides basic information on the significant geologic features and processes occurring in the park. Links to products from Baseline Geologic and Soil Resources Inventories provide access to maps and reports.