National Park of American Samoa National Park Service American Samoa U.S. Department of the Interior Geologic Map of National Park of American Samoa
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National Park of American Samoa Boundary Linear Dikes Geologic Units This map graphically presents digital geologic data prepared as part of the NPS Geologic Resources Qlp - Luatele Formation, pahoehoe flows Ppi - Pago Volcanic Series, lithic-vitric tuff Qnt - Nu’u Formation—tuff landfill Division’s Geologic Resource Evaluation Program. The source map used in creation of the digital geologic Qlc - Luatele Fm, poned lavas Ppi - Pago Volcanic Series, intra-caldera data product was: Geologic Attitude and Observation Localities o Ttae - Tuafanua Formation—A’ofa shield plug Qtec - Tunoa Fm, cinder cones - basalt & olivine basalt Pa - Alofau Volcanics strike and dip of beds Tuafanua Formation—Sili shield Ra - beach sand and alluvium Geology of Tutuila island - Harold T. Stearns, 1994, Geology of the Samoan Islands: Geological Society of Qte - Tunoa Fm, lava flows - basalt & olivine basalt Pol - Olomoana Volcanics America, Vol. 55, pp. 1279-1332. Scale approximately 1:63,000. ehorizontal beds Po - Taputapu Volcanics Rll - Leone Volcanics, pahoehoe flow Qtcc - Tunoa Fm, cinder cones - ash, tuff & olivine basalt Pm - Masefau Dike Complex Volcanic Point Features Geology of Tau island - Gary D. Stice and Floyd W. McCoy, Jr. 1968, Geology of the Manu’a Islands, Ppe - Pago Volcanic Series Rlc - Leone Volcanics, cinder cone S# Qtc - Tunoa Fm, ash, tuff & olivine basalt Ttae - Tuafanua Fm, A'ofa shield Samoa: Pacific Science, Vol. XXII. Scale approximately 1:56,000. plug Ppi - Pago V. Series—andesite/basalt flows Rla - Leone Volcanics, ash cone $ Qlel - Lata Fm, post-caldera lava flows Tts - Tuafanua Fm, Sili shield outcrop of vitric tuff or cinders Geology of Ofu and Olosega islands - Gary D. Stice and Floyd W. McCoy, Jr. 1968, Geology of the Manu’a Tle - Lata Formation—pre-caldera Rlt - Leone Volcanics, lithic-vitric tuff Qlec - Lata Fm, post-caldera cinder cone Ttai - Tuafanua Fm, ponded flows Islands, Samoa: Pacific Science, Vol. XXII. Scale approximately 1:56,000. Linear Volcanic Features Pa - Alofau Volcanics Rat - 'Aunu'u Tuff caldera, approximate Qle - Lata Fm, post caldera volcanics Tafi - Asaga Fm, associated plug Digital geologic data and cross sections for National Park of American Samoa, and all other digital geologic Pol - Olomoana Volcanics Qb - beach deposits data prepared as part of the Geologic Resource Evaluation Program, are available online at the NPS Data caldera, concealed Qlil - Lata Fm, intra-caldera associated lava flows Tafb - Asaga Fm, breccia cone Faults Pm - Masefau Dike Complex Qa - alluvium, talus and stream deposits Store: http://science.nature.nps.gov/nrdata/ Qlic - Lata Fm, intra-caldera cinder cone Tat - Asaga Fm, composite cone Geologic Contacts known or certain Qm - marsh Qli - Lata Fm, intra-caldera member Tam - tuff cone known or certain approximate Qnt - Nu'u Formation, lapilli tuff Pt - Trachyte plugs and dikes Tas - tuff cone approximate Qnl - Nu'u Formation, basalt flows concealed Ptp - Trachytic pumice deposits Tac - cinder cone shoreline Qfc - Fiti'uta Formation, cinder cone 0 1.25 2.5 5 Po - Taputapu Volcanics Tle - Lata Fm, pre-Caldera member Qfl - Fiti'uta Formation Kilometers Ppe - Pago Volcanic Series 0 1 2 4 Qft - Faleasao Formation Miles q Produced by Geologic Resources Division January 2008