Mylonitic granite batholith in the Zambezi orogenic belt, Zambia. This rock has yielded an U-Pb zircon age of 820 +/- 7 Ma. See Hanson, Wilson, and Wardlaw (1988).	Isolated Proterozoic bedrock exposure in Kalahari Desert View shows quartzites in part of Tsodilo Hills, NW Botswana See Singletary et al. (2003).

Published Papers (Peer Reviewed):

2010 Rioux, M., Bowring, S., Dudás, F., and Hanson, R., Characterizing the U-Pb systematics of baddeleyite through chemical abrasion: Application of multi-step digestion methods to baddeleyite geochronology: Contributions to Mineralogy and Petrology, in press.

2009 Befus, K.S., Hanson, R.E., Miggins, D.P., Breyer, J.A., and Busbey, A.B., Nonexplosive and explosive magma/wet-sediment interaction during emplacement of Eocene intrusions into Cretaceous to Eocene strata, Trans-Pecos igneous province, West Texas: Journal of Volcanology and Geothermal Research, v. 181, p. 155-172.

2008 Befus, K.S., Hanson, R.E., Lehman, T.M., and Griffin, W.R., Cretaceous basaltic phreatomagmatic volcanism in West Texas: maar complex at Peña Mountain, Big Bend National Park: Journal of Volcanology and Geothermal Research, v. 173, p. 245-264.

2007 Breyer, J.A., Busbey, A.B., Hanson, R.E., Befus, K.E., Griffin, W.R., Hargrove, U.S., and Bergman, S.C., Evidence for Late Cretaceous volcanism in Trans-Pecos Texas: Journal of Geology, v. 115, p. 243-251.

2006 Gose, W.A., Hanson, R.E., Dalziel, I.W.D., Pancake, J.A., and Seidel, E.K., Paleomagnetism of the 1.1 Ga Umkondo large igneous province in southern Africa: Journal of Geophysical Research, v. 111, 18 p. (doi:10.1029/2005JB003897).

2006 Hanson, R.E., Harmer, R.E., Key, R.M., Blenkinsop, T.G., Bullen, D.S., Dalziel, I.W.D., Gose, W.A., Hall, R.P., Kampunzu, A.B., Mukwakwami, J., Munyanyiwa, H., Pancake, J.A., Seidel, E.K., and Ward, S.E., Mesoproterozoic intraplate magmatism in the Kalahari craton: a review: Journal of African Earth Sciences (special volume on Mesoproterozoic orogenic belts in southern and central Africa), v. 46, p. 141-167.

2004 Hanson, R.E., Crowley, J.L., Bowring, S.A., Ramezani, J., Gose, W.A., Dalziel, I.W.D., Pancake, J.A., Seidel, E.K., Blenkinsop, T.G., and Mukwakwami, J., Coeval large-scale magmatism in the Kalahari and Laurentian cratons during Rodinia assembly: Science, v. 304, p. 1126-1129.

***A free reprint of the Science paper can be obtained by going to http://www.sciencemag.org/cgi/reprint/1096329v1?ijkey=svPbmTcHfQwjs&keytype=ref&siteid=sci

2004 Hanson, R.E., Gose, W.A., Crowley, J.L., Ramezani, J., Bowring, S.A., Bullen, D.S., Hall, R.P., Pancake, J.A., and Mukwakwami, J., Paleoproterozoic intraplate magmatism and basin development on the Kaapvaal craton: age, paleomagnetism and geochemistry of ~1.93 to ~1.87 Ga post-Waterberg dolerites: South African Journal of Geology, v. 107, p. 233-254.

2003 Hanson, R.E., Proterozoic geochronology and tectonic evolution of southern Africa, in Yoshida, M., Windley, B.F., and Dasgupta, S. (eds.), Proterozoic East Gondwana: supercontinent assembly and breakup: Geological Society of London Special Publication 206, p. 427-463.

2003 Hargrove, U.S., Hanson, R.E., Martin, M.W., Blenkinsop, T.G., Bowring, S.A., Walker, N., and Munyanyiwa, H., Tectonic evolution of the Zambezi orogenic belt: geochronological, structural, and petrological constraints from northern Zimbabwe: Precambrian Research, v. 123, p. 159-186.

2003 Singletary, S.J., Hanson, R.E., Martin, M.W., Crowley, J.L., Bowring, S.A., Key, R.M., Ramokate, L.V., Direng, B.B., and Krol, M.A., Geochronology of basement rocks in the Kalahari Desert, Botswana, and implications for regional Proterozoic tectonics: Precambrian Research, v. 121, p. 47-71.

2003 Templeton, J.H., and Hanson, R.E., Jurassic submarine arc-apron deposits and associated magma/wet-sediment interaction, northern Sierra Nevada, California: Journal of Volcanology and Geothermal Research, v. 128, p. 299-326.

2001 Elliot, D.H., and Hanson, R.E., Origin of widespread, exceptionally thick phreatomagmatic tuff breccia in the Middle Jurassic Prebble and Mawson Formations, Antarctica: Journal of Volcanology and Geothermal Research, v. 111, p. 183-201.

2001 Majaule, T., Hanson, R.E., Key, R.M., Singletary, S.J., Martin, M.W., and Bowring, S.A., The Magondi belt in northeast Botswana: regional relations and new geochronological data from the Sua Pan area: Journal of African Earth Sciences, v. 32, p. 257-267.

2001 Vinyu, M.L., Hanson, R.E., Martin, M.W., Bowring, S.A., Jelsma, H.A., and Dirks, P.H.G.M., U-Pb zircon ages from a craton-margin Archaean orogenic belt in northern Zimbabwe: Journal of African Earth Sciences, v. 32, p. 103-114.

1999 Vinyu, M.L., Hanson, R.E., Martin, M.W., Bowring, S.A., Jelsma, H.A., Krol, M.A., and Dirks, P.H.G.M., U-Pb and 40Ar/39Ar geochronological constraints on the tectonic evolution of the easternmost part of the Zambezi orogenic belt, northeast Zimbabwe: Precambrian Research, v. 98, p. 67-82.

1999 Hanson, R.E., and Hargrove, U.S., Processes of magma/wet sediment interaction in a large-scale Jurassic andesitic peperite complex, northern Sierra Nevada, California: Bulletin of Volcanology, v. 60, p. 610-626.

1998 Hanson, R.E., Martin, M.A., Bowring, S.A., and Munyanyiwa, H., U-Pb zircon age for the Umkondo dolerites, eastern Zimbabwe: 1.1 Ga large igneous province in southern Africa/East Antarctica and possible Rodinia correlations: Geology, v. 26, p. 1143-1146.

1997 Hargrove, U.S., and Hanson, R.E., Geology of the Huntley Mill Lake sill complex: a multiphase peperitic sill intruded into wet sediments, Jurassic, northern Sierra Nevada, California, in Girty, G.H., Hanson, R.E., and Cooper, J.D. (eds.), Geological evolution of the western Cordillera: perspectives from undergraduate research: Society for Sedimentary Geology (SEPM), Pacific Section, Book 82, p. 111-122.

1997 Kulow, M.J., Hanson, R.E., and Girty, G.H., The Big Bend shear zone: Early Cretaceous ductile deformation associated with pluton emplacement in the Northern Sierra terrane, California, in Girty, G.H., Hanson, R.E., and Cooper, J.D. (eds.), Geological evolution of the western Cordillera: perspectives from undergraduate research: Society for Sedimentary Geology (SEPM), Pacific Section, Book 82, p. 79-90.

1997 Munyanyiwa, H., Hanson, R.E., Blenkinsop, T.G., and Treloar, P.J., Geochemistry of amphibolites and quartzofeldspathic gneisses in the Pan-African Zambezi belt, NW Zimbabwe: evidence for bimodal magmatism in a continental rift setting: Precambrian Research, v. 81, p. 179-196.

1997 Wilson, T.J., Grunow, A.M., and Hanson, R.E., Gondwana assembly: the view from southern Africa and East Gondwana: Journal of Geodynamics, v. 23, p. 263-286.

1996 Grunow, A., Hanson, R.E., and Wilson, T.J., Were aspects of Pan-African deformation linked to Iapetus opening? Geology, v. 24, p. 1063-1066.

1996 Hanson, R.E., and Elliot, D.H., Rift-related Jurassic basaltic phreatomagmatism in the central Transantarctic Mountains: precursory stage to flood-basalt volcanism: Bulletin of Volcanology, v. 58, p. 327-347.

1995 Breyer, J.A., Busbey, A.B., Hanson, R.E., and Roy, E.C., Possible new evidence for the origin of metazoans prior to one b.y. ago: sediment-filled tubes from the Mesoproterozoic Allamoore Formation, Trans-Pecos Texas: Geology, v. 23, p. 269-272.

1995 DeGroat, P.J., Donovan, R.N., Hanson, R.E., and Weaver, B.L., Cambrian diabase and gabbro in the Blue Creek Canyon area, Wichita Mountains, southwestern Oklahoma: Oklahoma Geology Notes, v. 55, p. 168-186.

1995 Girty, G.H., Hanson, R.E., Girty, M.S., Schweickert, R.A., Harwood, D.S., Yoshinobu, A.S., Bryan, K.A., Skinner, J.E., and Hill, C.A., Timing of emplacement of the Haypress Creek and Emigrant Gap plutons: implications for the timing and controls of Jurassic orogenesis, northern Sierra Nevada, California, in Miller, D.M., and Busby, C. (eds.), Jurassic magmatism and tectonics of the North American Cordillera: Geological Society of America Special Paper 299, 191-201.

1994 Hanson, R.E., Wilson, T.J., and Munyanyiwa, H., Geologic evolution of the Neoproterozoic Zambezi orogenic belt in Zambia: Journal of African Earth Sciences, v. 18, p. 135-150.

1994 Miller, C.A., Barton, M., Hanson, R.E., and Fleming, T.H., An Early Cretaceous volcanic arc/marginal basin transition zone, Peninsula Hardy, southernmost Chile: Journal of Volcanology and Geothermal Research, v. 63, p. 33-58.

1993 Girty, G.H., Yoshinobu, A.S., Wracher, M.D., Girty, M.S., Bryan, K.A., Skinner, J.E., McNulty, B.A., Bracchi, K.A., Harwood, D.S., and Hanson, R.E., U-Pb zircon geochronology of the Emigrant Gap composite pluton, northern Sierra Nevada, California: implications for the Nevadan orogeny, in Dunne, G., and McDougall, K. (eds.), Mesozoic paleogeography of the western U.S. - II: Society of Economic Paleontologists and Mineralogists, Pacific Section, Book 71, p. 323-332.

1993 Hanson, R.E., and Wilson, T.J., Large-scale rhyolite peperites (Jurassic, southern Chile): Journal of Volcanology and Geothermal Research, v. 54, p. 247-264.

1993 Hanson, R.E., Wardlaw, M.S., Wilson, T.J., and Mwale, G., U-Pb zircon ages from the Hook granite massif and Mwembeshi dislocation: constraints on Pan-African deformation, plutonism, and transcurrent shearing in central Zambia: Precambrian Research, v. 63, p. 189-209.

1993 Wilson, T.J., Hanson, R.E., and Wardlaw, M.S., Late Proterozoic evolution of the Zambezi belt, Zambia: implications for regional Pan-African tectonics and shear displacements in Gondwana, in Findlay, R.H., Unrug, R., Banks, M.R., and Veevers, J.J. (eds.), Gondwana 8 - assembly, evolution, and dispersal (Gondwana 8 Symposium Volume): Balkema, Rotterdam, p. 69-82.

1992 Bigger, S.E., and Hanson, R.E., Devitrification textures and related features in the Carlton Rhyolite in the Blue Creek Canyon area, Wichita Mountains, southwestern Oklahoma: Oklahoma Geology Notes, v. 52, p. 124-142.

1991 Hanson, R.E., Quenching and hydroclastic disruption of andesitic to rhyolitic intrusions in a submarine island-arc sequence, northern Sierra Nevada, California: Geological Society of America Bulletin, v. 103, p. 804-816.

1991 Hanson, R.E., and Wilson, T.J., Submarine rhyolitic volcanism in a Jurassic proto-marginal basin, southern Andes, Chile and Argentina, in Harmon, R.S., and Rapela, C.W. (eds.), Andean magmatism and its tectonic setting: Geological Society of America Special Paper 265, p. 13-27.

1991 Wilson, T.J., Grunow, A.M., Hanson, R.E., and Schmitt, K.R., Subduction complex rocks on Diego Ramirez Islands, Chile, in Thomson, M.R.A., Crame, J.A., and Thomson, J.W. (eds.), Geological evolution of Antarctica: Cambridge University Press, p. 419-421.

1989 Wilson, T.J., Hanson, R.E., and Grunow, A.M., Multistage melange formation within an accretionary complex, Diego Ramirez Islands, southern Chile: Geology, v. 17, p. 11-14.

1988 Hanson, R.E., Saleeby, J.B., and Schweickert, R.A., Composite Devonian island-arc batholith in the northern Sierra Nevada, California: Geological Society of America Bulletin, v. 100, p. 446-457.

1988 Hanson, R.E., Wilson, T.J., and Wardlaw, M.S., Deformed batholiths in the Pan-African Zambezi belt, Zambia: age and implications for regional Proterozoic tectonics: Geology, v. 16, p. 1134-1137.

1988 Hanson, R.E., Wilson, T.J., Brueckner, H.K., Onstott, T.C., Wardlaw, M.S., Johns, C.C., and Hardcastle, K.C., Reconnaissance geochronology, tectonothermal evolution, and regional significance of the Middle Proterozoic Choma-Kalomo block, southern Zambia: Precambrian Research, v. 42, p. 39-61.

1988 Munyanyiwa, H., and Hanson, R.E., Geochemistry of marbles and calc-silicate rocks in the Pan-African Zambezi belt, Zambia: Precambrian Research, v. 38, p. 177-200.

1986 Hanson, R.E., and Schweickert, R.A., Stratigraphy of mid-Paleozoic island-arc rocks in part of the northern Sierra Nevada, Sierra and Nevada Counties, California: Geological Society of America Bulletin, v. 97, p. 986-998.

1985 Schweickert, R.A., Bogen, N.L., Girty, G.H., Hanson, R.E., and Merguerian, C., Timing and structural expression of the Nevadan orogeny, Sierra Nevada, California: Reply: Geological Society of America Bulletin, v. 96, p. 1349-1352.

1984 Elthon, D., Hanson, R., Allen, R., and Vergara, H., Unusual ocellar textures in diabases from the Sarmiento ophiolite complex, Chile: Canadian Journal of Earth Sciences, v. 21, p. 376-378.

1984 Elthon, D., Lawrence, J.R., Hanson, R.E., and Stern, C., Modelling of oxygen-isotope data from the Sarmiento ophiolite complex, Chile, in Gass, I.G., Lippard, S.J., and Shelton, A.W. (eds.), Ophiolites and oceanic lithosphere: Geological Society of London Special Publication No. 13, p. 185-197.

1984 Girty, G.H., Wardlaw, M.S., Schweickert, R.A., Hanson, R.E., and Bowring, S.A., Timing of pre-Antler deformation in the Shoo Fly Complex, Sierra Nevada, California: Geology, v. 12, p. 673-676.

1984 Schweickert, R.A., Bogen, N.L., Girty, G.H., Hanson, R.E., and Merguerian, C., Timing and structural expression of the Nevadan orogeny, Sierra Nevada, California: Geological Society of America Bulletin, v. 95, p. 967-979.

1982 Hanson, R.E., and Schweickert, R.A., Chilling and brecciation of a Devonian rhyolite sill intruded into wet sediments, northern Sierra Nevada, California: Journal of Geology, v. 90, p. 717-724.

1980 Al-Shaieb, Z., Hanson, R.E., Donovan, R.N., and Shelton, J.W., Petrology and diagenesis of sandstones in the Post Oak Formation (Permian), southwestern Oklahoma: Journal of Sedimentary Petrology, v. 50, p. 43-50.

1980 Hanson, R.E., and Al-Shaieb, Z., Voluminous subalkaline silicic magmas related to intracontinental rifting in the Southern Oklahoma aulacogen: Geology, v. 8, p. 180-184.

1977 Al-Shaieb, Z., Olmsted, R.W., Shelton, J.W., May, R.T., Owens, R.T., and Hanson, R.E., Uranium potential of Permian and Pennsylvanian sandstones in Oklahoma: American Association of Petroleum Geologists Bulletin, v. 61, p. 360-375.

1998 Hargrove, U.S., and Hanson, R.E., Large-scale peperites associated with a multiphase andesitic sill intruded into wet sediments, Jurassic, northern Sierra terrane, California: The Compass (Journal of Earth Sciences, Sigma Gamma Epsilon), v. 74, p. 95-102.

1998 Kulow, M.J., Hanson, R.E., Girty, G.H., Girty, M.S., and Harwood, D.S., Cretaceous plutonic rocks in the Donner Lake-Cisco Grove area, northern Sierra Nevada, California: The Compass (Journal of Earth Sciences, Sigma Gamma Epsilon), v. 74, p. 69-76.

1998 Mielke, K.L., Hanson, R.E., Girty, G.H., Girty, M.S., and Schweickert, R.A., Jurassic island-arc rocks in the Webber Peak and Meadow Lake areas, northern Sierra terrane, California: The Compass (Journal of Earth Sciences, Sigma Gamma Epsilon), v. 74, p. 77-86.

1998 Phillipson, S.E., Hanson, R.E., Girty, G.H., and Girty, M.S., Petrology and geochronology of the intrusive suite of Haypress Creek (Middle Jurassic), northern Sierra terrane, California: The Compass (Journal of Earth Sciences, Sigma Gamma Epsilon), v. 74, p. 87-94.

1995 Hanson, R.E., and Elliot, D.H., Jurassic phreatomagmatic volcanism in the central Transantarctic Mountains: Antarctic Journal of the U.S., v. 29, no. 5, p. 33-35.

1991 Elliot, D.H., Fleming, T.H., Miller, C.A., and Hanson, R.E., Mesozoic volcanic rocks in the Queen Alexandra Range: Antarctic Journal of the U.S., v. 26, no. 5, p. 3-4.

1990 Hanson, R.E., Wilson, T.J., Wardlaw, M.S., Brueckner, H.K., and Onstott, T.C., A review of new geochronological data for the Proterozoic of central and southern Zambia: Zambian Journal of Applied Earth Sciences, v. 4, p. 6-18.

2000 Hanson, R.E., Girty, G.H., Harwood, D.S., and Schweickert, R.A., Paleozoic subduction complex and Paleozoic-Mesozoic island-arc volcano-plutonic assemblages in the northern Sierra terrane, in Lageson, D.R., Peters, S.G., and Lahren, M.M. (eds.), Great Basin and Sierra Nevada: Geological Society of America Field Guide Series, v. 2, 255-277.

1999 Schweickert, R.A., Hanson, R.E., and Girty, G.H., Accretionary tectonics of the Western Sierra Nevada Metamorphic Belt, in Wagner, D.L., and Graham, S.A. (eds.), Geologic Field Trips in Northern California (for Centennial Meeting of the Cordilleran Section of the Geological Society of America: California Division of Mines and Geology Special Publication 119, p. 33-79.

1996 Hanson, R.E., Girty, G.H., Girty, M.S., Hargrove, U.S., Harwood, D.S., Kulow, M.J., Mielke, K.L., Phillipson, S.E., Schweickert, R.A., and Templeton, J.H., Paleozoic and Mesozoic arc rocks in the Northern Sierra terrane, in Girty, G.H., Hanson, R.E., Harwood, D.S., and Schweickert, R.A. (eds.), The Northern Sierra terrane and associated Mesozoic magmatic units: implications for the tectonic history of the western Cordillera: Society for Sedimentary Geology (SEPM), Pacific Section, Book 81, p. 25-55.

1993 Hanson, R.E., Girty, G.H., Harwood, D.S., Schweickert, R.A., Templeton, J.H., Yoshinobu, A.S., Wracher, M.D., and Girty, M.S., Devonian and Jurassic volcano-plutonic associations in the Northern Sierra terrane: implications for arc evolution and Mesozoic deformation, in Lahren, M.M., Trexler, J.H., Jr., and Spinosa, C. (eds.), Crustal evolution of the Great Basin and the Sierra Nevada: Geological Society of America, Field Trip Guidebook for 1993 Cordilleran/Rocky Mountain Sections Joint Meeting, p. 97-128.

1989 Hanson, R.E., Geology of Peninsula Hardy, Isla Hoste (southern Chile), in Dalziel, I.W.D. (ed.), Tectonics of the Scotia Arc, Antarctica: 28th International Geological Congress, Field Trip Guidebook T 180, p. 71-76.

1989 Wilson, T.J., Hanson, R.E., and Grunow, A.M., Geology of Islas Diego Ramirez (southern Chile), in Dalziel, I.W.D. (ed.), Tectonics of the Scotia Arc, Antarctica: 28th International Geological Congress, Field Trip Guidebook T 180, p. 76-81.

1984 Schweickert, R.A., Harwood, D.S., Girty, G.H., and Hanson, R.E., Tectonic development of the Northern Sierra terrane: an accreted late Paleozoic island arc and its basement, in Lintz, J. (ed.), Western geological excursions: Geological Society of America 1984 Annual Meeting, Field Trip Guides, v. 4, p. 1-65.

1978 Al-Shaieb, Z., Donovan, R.N., Hanson, R.E., Morrison, C.M., Olmsted, R.W., and Shelton, J.W., Guidebook to uranium mineralization in sedimentary and igneous rocks of Wichita Mountains region, southwestern Oklahoma: American Association of Petroleum Geologists, 1978 Convention, Energy Minerals Division, Field Trip Guidebook, 73 p.

Edited Volumes:

2006 McCourt, S., Hanson, R.E., and Key, R. (eds.), Mesoproterozoic orogenic belts in southern and central Africa: Journal of African Earth Sciences Special Issue, v. 46, nos. 1-2.

1997 Girty, G.H., Hanson, R.E., and Cooper, J.D. (eds.), Geological evolution of the western Cordillera: perspectives from undergraduate research: Society for Sedimentary Geology (SEPM), Pacific Section, Book 82, 135 p.

1996 Girty, G.H., Hanson, R.E., Harwood, D.S., and Schweickert, R.A. (eds.), The Northern Sierra terrane and associated Mesozoic magmatic units: implications for the tectonic history of the western Cordillera: Society for Sedimentary Geology (SEPM), Pacific Section, Book 81, 92 p.