Legend (Public_Geology/250k_Surface_Geology)

Continental Ice Limits (0) Continental ice limit, late Wisconsinan—Identity and existence certain, location accurate Continental ice limit, pre-late Wisconsinan—Identity and existence certain, location accurate Folds (1) Syncline—Identity and existence certain, location approximate, points in direction of plunge Overturned syncline—Identity and existence certain, location accurate. Beds on one limb are overturned; arrows show dip direction of limbs, points in direction of plunge Overturned anticline—Identity and existence certain, location accurate. Beds on one limb are overturned; arrows show dip direction of limbs, points in direction of plunge Anticline—Identity and existence certain, location approximate, points in direction of plunge Monocline, anticlinal bend—Identity and existence certain, location approximate. Arrows show direction of dip; shorter arrow on steeper limb Overturned anticline—Identity and existence certain, location concealed. Beds on one limb are overturned; arrows show dip direction of limbs Overturned syncline—Identity and existence certain, location concealed. Beds on one limb are overturned; arrows show dip direction of limbs Syncline—Identity and existence certain, location concealed, points in direction of plunge Overturned anticline—Identity and existence certain, location accurate. Beds on one limb are overturned; arrows show dip direction of limbs Overturned syncline—Identity and existence certain, location accurate. Beds on one limb are overturned; arrows show dip direction of limbs Anticline—Identity and existence certain, location concealed, points in direction of plunge Anticline—Identity and existence certain, location approximate Syncline—Identity and existence certain, location approximate Syncline—Identity and existence certain, location accurate, points in direction of plunge Monocline, anticlinal bend —Identity and existence certain, location concealed. Arrows show direction of dip; shorter arrow on steeper limb Monocline, synclinal bend—Identity and existence certain, location concealed. Arrows show direction of dip; shorter arrow on steeper limb Monocline, synclinal bend—Identity and existence certain, location accurate. Arrows show direction of dip; shorter arrow on steeper limb Monocline, anticlinal bend—Identity and existence certain, location accurate. Arrows show direction of dip; shorter arrow on steeper limb Anticline—Identity and existence certain, location accurate, points in direction of plunge Syncline—Identity and existence certain, location concealed Anticline—Identity and existence certain, location concealed Syncline—Identity and existence certain, location accurate Anticline—Identity and existence certain, location accurate Faults (2) Fault , unknown offset—Identity and existence certain, location concealed Fault, unknown offset—Identity and existence certain, location accurate Fault, unknown offset—Identity and existence certain, location approximate Fault, unknown offset—Identity and existence certain, location inferred Fault, unknown offset—Identity or existence questionable, location accurate Fracture—Identity and existence certain, location accurate Low-angle normal fault—Identity and existence certain, location accurate. Half-circles on downthrown block Low-angle normal fault—Identity and existence certain, location concealed. Half-circles on downthrown block Low-angle normal fault—Identity or existence questionable, location accurate. Half-circles on downthrown block Normal fault—Identity and existence certain, location accurate. Bar and ball on downthrown block Normal fault—Identity and existence certain, location approximate. Bar and ball on downthrown block Normal fault—Identity and existence certain, location concealed. Bar and ball on downthrown block Normal fault—Identity and existence certain, location inferred. Bar and ball on downthrown block Normal fault—Identity or existence questionable, location accurate. Bar and ball on downthrown block Oblique-slip fault, normal left-lateral offset—Identity and existence certain, location accurate. Arrows show relative motion; bar and ball on downthrown block Oblique-slip fault, normal right-lateral offset—Identity and existence certain, location accurate. Arrows show relative motion; bar and ball on downthrown block Oblique-slip fault, normal right-lateral offset—Identity and existence certain, location concealed. Arrows show relative motion; bar and ball on downthrown block Reverse fault—Identity and existence certain, location accurate. Rectangles on upthrown block Strike-slip fault, left-lateral offset—Identity and existence certain, location accurate. Arrows show relative motion Strike-slip fault, left-lateral offset—Identity and existence certain, location concealed. Arrows show relative motion Strike-slip fault, left-lateral offset—Identity and existence certain, location inferred. Arrows show relative motion Strike‑slip fault, right-lateral offset— Identity and existence certain, location inferred. Arrows show relative motion Strike‑slip fault, right-lateral offset—Identity and existence certain, location accurate. Arrows show relative motion Strike‑slip fault, right-lateral offset—Identity and existence certain, location concealed. Arrows show relative motion Thrust fault—Identity and existence certain, location accurate. Sawteeth on upper (tectonically higher) plate Thrust fault—Identity and existence certain, location approximate. Sawteeth on upper (tectonically higher) plate Thrust fault—Identity and existence certain, location concealed. Sawteeth on upper (tectonically higher) plate Thrust fault—Identity and existence certain, location inferred. Sawteeth on upper (tectonically higher) plate Thrust fault—Identity or existence questionable, location accurate. Sawteeth on upper (tectonically higher) plate Contacts (3) Contact—Identity and existence certain, location accurate Gradational contact—Identity and existence certain, location accurate Shoreline—Showing open water Modern or present-day glacial ice boundary Scratch boundary Map boundary Map Units (8) Quaternary alluvium, dune sand, loess, and modified land Quaternary beach, continental sedimentary, lacustrine, fluvial, mass-wasting, terraced sedimentary, and peat deposits Pleistocene Bonneville flood deposits Quaternary sedimentary deposits or rocks, undivided Quaternary alluvium, older (includes alluvial fans and talus) Pleistocene glacial drift, alpine, Fraser-age Pleistocene (Fraser-age) continental glacial drift, outburst flood deposits, and glaciolacustrine deposits Pleistocene glacial drift, alpine, pre-Fraser Pleistocene glacial drift, continental, pre-Fraser Quaternary–Pliocene and Pliocene continental sedimentary deposits or rocks Pliocene–Miocene continental sedimentary deposits or rocks and mass-wasting deposits Miocene continental sedimentary rocks Miocene–Eocene continental sedimentary rocks Eocene continental sedimentary rocks Older Eocene continental sedimentary rocks Tertiary–Cretaceous continental sedimentary rocks Cretaceous continental sedimentary rocks Lower Cretaceous continental sedimentary rocks, conglomerate Devonian continental sedimentary rocks, conglomerate Pliocene–Miocene nearshore sedimentary rocks Miocene nearshore sedimentary rocks Oligocene–Eocene nearshore sedimentary rocks Eocene nearshore sedimentary rocks Cretaceous nearshore sedimentary rocks Miocene marine sedimentary rocks Miocene to Eocene marine sedimentary rocks Eocene marine sedimentary rocks Older Eocene marine sedimentary rocks Upper Cretaceous marine sedimentary rocks Lower Cretaceous marine sedimentary rocks Paleocene–Cretaceous volcanic and sedimentary rocks, undivided Jurassic–Permian volcanic and sedimentary rocks Quaternary lava flows Pleistocene–Pliocene and Pliocene lava flows Miocene lava flows Miocene Saddle Mountains Basalt Miocene Saddle Mountains Basalt, invasive Miocene Wanapum Basalt Miocene Grande Ronde Basalt Miocene Grande Ronde Basalt, invasive Miocene Imnaha Basalt Miocene–Oligocene and Oligocene lava flows Oligocene–Eocene and younger Eocene lava flows Eocene lava flows Eocene basalt flows, Crescent Formation Quaternary fragmental volcanic rocks or deposits Pliocene tuffs and tuff breccias Miocene fragmental volcanic rocks or deposits Miocene–Oligocene and Oligocene fragmental volcanic rocks Oligocene–Eocene and Eocene fragmental volcanic rocks Eocene fragmental volcanic rocks Quaternary intrusive igneous rocks Pleistocene–Pliocene and Pliocene to Miocene intrusive igneous rocks Miocene–Oligocene and Oligocene intrusive igneous rocks Oligocene–Eocene and Eocene intrusive igneous rocks Paleocene intrusive igneous rocks Tertiary–Cretaceous intrusive igneous rocks Pre-Tertiary ultrabasic (ultramafic) rocks Cretaceous intrusive igneous rocks Mesozoic intrusive igneous rocks Mesozoic and Paleozoic intrusive igneous rocks Middle-upper Proterozoic basic (mafic) intrusive rocks Pre-Tertiary metasedimentary and metavolcanic rocks Pre-Tertiary marble Cretaceous metasedimentary and metavolcanic rocks, undivided Cretaceous–Jurassic sedimentary, metasedimentary, volcanic, and metavolcanic rocks Pre-Cretaceous–Devonian metasedimentary and metavolcanic rocks Pre-Jurassic to middle Proterozoic metasedimentary rocks Triassic–Permian metasedimentary and metavolcanic rocks Mesozoic schist Permian and pre-Permian metasedimentary rocks Permian–Devonian metasedimentary and metavolcanic rocks Carboniferous–Devonian metasedimentary and metavolcanic rocks Carboniferous–Ordovician metasedimentary and metavolcanic rocks Devonian and Silurian metasedimentary rocks Ordovician metasedimentary and metavolcanic rocks Ordovician–Cambrian metacarbonate Cambrian metasedimentary rocks Cambrian–upper Proterozoic quartzite Upper Proterozoic metasedimentary and metavolcanic rocks Middle Proterozoic metasedimentary rocks Middle Proterozoic metasedimentary rocks Middle Proterozoic metasedimentary rocks Paleocene orthogneiss Tertiary–Cretaceous banded gneiss Tertiary–Cretaceous orthogneiss and mixed metamorphic and igneous rocks Pre-Tertiary metamorphic rocks Cretaceous metamorphic rocks Cretaceous orthogneiss and migmatite Cretaceous–Jurassic and Jurassic metamorphic rocks Triassic heterogeneous metamorphic rocks Triassic orthogneiss Triassic–Permian metamorphic rocks (high and low? grade) Mesozoic orthogneiss and migmatite Mesozoic to Paleozoic metamorphic rocks Pre-Devonian gneiss Precambrian metamorphic rocks Precambrian metasedimentary rocks Water Ice Features in Oregon, geology not shown Tectonic zone Data Source Polygons (5)