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CLICK ON A COLORED AREA OF THE GEOLOGY MAP TO SHOW INFORMATION HERE |
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wtr |
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water |
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tz |
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tectonic zone |
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tz(o) |
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tectonic zone |
Orcas Island, tectonic zone on |
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Qa |
Holocene |
alluvium |
--- |
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Qaf |
Holocene |
alluvial fan deposits |
--- |
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Qb |
Holocene |
beach deposits |
--- |
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Qf |
Holocene |
artificial fill, including modified land |
--- |
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Qp |
Holocene |
peat deposits |
--- |
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Qls |
Quaternary |
mass-wasting deposits, mostly landslides
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Qoa |
Holocene-Pleistocene |
alluvium, older |
--- |
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Qvl(k) |
Holocene-Pleistocene |
lahars |
Kennedy Creek assemblage |
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Qat(e) |
Pleistocene |
alpine glacial till, Fraser-age |
Evans Creek Drift, till deposits |
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Qc(w) |
Pleistocene |
continental sedimentary deposits or rocks |
Whidbey Formation |
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Qga |
Pleistocene |
advance continental glacial outwash,Fraser-age |
mostly Vashon Stade in western WA; unnamed in eastern WA |
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Qgd |
Pleistocene |
continental glacial drift, Fraser-age |
mostly Vashon Stade in western WA; unnamed in eastern WA |
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Qgdm(e) |
Pleistocene |
glaciomarine drift, Fraser-age |
Everson Glaciomarine Drift |
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Qgo(e) |
Pleistocene |
continental glacial outwash, Fraser-age |
Everson Interstade, outwash deposits of |
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Qgo(es) |
Pleistocene |
continental glacial outwash, Fraser-age |
Everson or Sumas, outwash deposits of |
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Qgo(s) |
Pleistocene |
continental glacial outwash, Fraser-age |
Sumas Stade, outwash of |
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Qgom(e) |
Pleistocene |
continental glacial outwash, marine, Fraser-age |
Everson Glaciomarine Drift, outwash, marine |
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Qgom(ee) |
Pleistocene |
continental glacial outwash, marine, Fraser-age |
Everson Glaciomarine Drift, emergence beach deposits of |
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Qgom(s) |
Pleistocene |
continental glacial outwash, marine, Fraser-age |
Sumas Stade |
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Qgt |
Pleistocene |
continental glacial till, Fraser-age |
mostly Vashon Stade in western WA; unnamed in eastern WA |
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Qgt(s) |
Pleistocene |
continental glacial till, Fraser-age |
Sumas Stade, till of the |
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Qvl(m) |
Pleistocene |
lahars |
center Fork Nooksack River, lahar deposits of |
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OEc(h) |
Oligocene-Eocene |
continental sedimentary deposits or rocks |
Huntingdon Formation |
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Ec(c) |
Eocene |
continental sedimentary deposits or rocks |
Chuckanut Formation |
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Ec(cb) |
Eocene |
continental sedimentary deposits or rocks |
Bellingham Bay Member, Chuckanut Formation |
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Ec(cg) |
Eocene |
continental sedimentary deposits or rocks |
Governor's Point Member, Chuckanut Formation |
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Ec(cm) |
Eocene |
continental sedimentary deposits or rocks |
Maple Falls Member, Chuckanut Formation |
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Ec(cp) |
Eocene |
continental sedimentary deposits or rocks |
Padden Member, Chuckanut Formation |
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Ec(cs) |
Eocene |
continental sedimentary deposits or rocks |
Slide Member, Chuckanut Formation |
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Ec(cw) |
Eocene |
continental sedimentary deposits or rocks |
Warnick Member, Chuckanut Formation |
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Tir |
Tertiary |
intrusive rhyolite |
--- |
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pTms(b) |
pre-Tertiary |
metasedimentary rocks |
Bald Mountain, conglomerate of |
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pTu |
pre-Tertiary |
ultrabasic rocks |
--- |
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pTu(ts) |
pre-Tertiary |
ultrabasic rocks |
Twin Sisters Dunite |
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Km(nc) |
Cretaceous |
marine sedimentary rocks |
Nanaimo Group, Cedar District Formation |
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Km(nh) |
Cretaceous |
marine sedimentary rocks |
Nanaimo Group, Haslam Formation |
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Km(np) |
Cretaceous |
marine sedimentary rocks |
Nanaimo Group, Protection Formation |
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Kn(nc) |
Cretaceous |
nearshore sedimentary rocks |
Nanaimo Group, Comox Formation |
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Kn(ne) |
Cretaceous |
nearshore sedimentary rocks |
Nanaimo Group, Extension Formation |
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KJm(c) |
Cretaceous-Jurassic |
marine sedimentary rocks |
Constitution Formation, Decatur terrane |
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KJm(f) |
Cretaceous-Jurassic |
marine sedimentary rocks |
Fidalgo ophiolite of Brown and others (1979) |
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KJmm(l) |
Cretaceous-Jurassic |
marine metasedimentary rocks |
Lummi Formation, metagraywacke of |
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Jhmc |
Jurassic |
heterogeneous metamorphic rocks, chert-bearing |
--- |
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Ji(f) |
Jurassic |
intrusive rocks, undivided |
Fidalgo ophiolite of Brown and others (1979) |
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Jigb(s) |
Jurassic |
gabbro |
Shuksan Greenschist |
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Jmt(l) |
Jurassic |
metasedimentary and metavolcanic rocks |
Lummi Formation |
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Jmv |
Jurassic |
metavolcanic rocks |
--- |
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Jmv(s) |
Jurassic |
metavolcanic rocks |
Shuksan Greenschist |
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Jph(d) |
Jurassic |
phyllite, low grade |
Darrington Phyllite |
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Jph(j) |
Jurassic |
phyllite, low grade |
Mount Josephine, semischist and phyllite of |
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Jsh(s) |
Jurassic |
schist, low grade |
Shuksan Greenschist |
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Ju(f) |
Jurassic |
ultrabasic rocks |
Fidalgo ophiolite of Brown and others (1979) |
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JTRmct(o) |
Jurassic-Triassic |
chert-rich marine sedimentary rocks |
Orcas Chert, Deadman Bay terrane |
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JPMhmc(b) |
Jurassic-Permian |
heterogeneous metamorphic rocks, chert bearing |
Bell Pass melange |
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JPMhmc(e) |
Jurassic-Permian |
heterogeneous metamorphic rocks, chert bearing |
Elbow Lake Formation |
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pThmc(b) |
Pre-Tertiary |
heterogeneous metamorphic rocks, chert bearing |
Vedder Complex |
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TRPMv(d) |
Triassic-Permian |
volcanic rocks |
Deadman Bay, volcanics of |
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pPMhm(v) |
pre-Permian |
heterogeneous metamorphic rocks |
Vedder Complex |
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pPMsc(g) |
pre-Permian |
schist, high grade |
Garrison Schist |
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PMDhm(c) |
Permian-Devonian |
heterogeneous metamorphic rocks |
Chilliwack Group of Cairnes (1944) |
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PMDmb(c) |
Permian-Devonian |
marble |
Chilliwack Group of Cairnes (1944) |
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PMDms(c) |
Permian-Devonian |
metasedimentary rocks |
Chilliwack Group of Cairnes (1944) |
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PMDmv(c) |
Permian-Devonian |
metavolcanic rocks |
Chilliwack Group of Cairnes (1944) |
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PMDvs(e) |
Permian-Devonian |
volcanic and sedimentary rocks |
East Sound Group |
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pDgn(y) |
pre-Devonian |
gneiss |
Yellow Aster Complex of Misch (1966) |
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pDi(t) |
pre-Devonian |
intrusive rocks, undivided |
Turtleback Complex |
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