74:
Beeson, M.H., Tolan, T.L., and
Anderson, J.L., 1989, The Columbia River Basalt Group in Western Oregon; Geologic Structures and other Factors that Controlled Flow Emplacement Patterns, in Reidel, ap. and Hooper, P.R., eds., Volcanism and tectonism in the Columbia River flood-basalt province, Geologic
93:
Liberty, L.M., Hemphill-Haley, M.A., and Madin, I.P., 2003, The
Portland Hills Fault –uncovering a hidden fault in Portland, Oregon using high-resolution geophysical methods, Tectonphysics, v.368. p. 89-103
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is approximately 40 miles (64 km) long and 20 miles (32 km) wide, with its long axis oriented northwest. Studies indicate that as much as 1,800 feet (550 m) of late
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Evarts, Russell C., 2004, Geologic Map of the boy
Quadrangle, Clark and Cowlitz Counties, Washington, U.S. Geological Survey
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is a roughly 770-square-mile (2,000 km) topographic and structural depression in the central
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and younger sediments have accumulated in the deepest part of the basin near
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55:. Most of the basin-fill material was carried in from the east by the
75:Society of America Special Paper 239, p223-246
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109:Structural basins of the United States
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119:Geology of Washington (state)
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114:Geology of Oregon
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49:Miocene
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