Charles Powell

Biography

Chuck’s USGS career started in 1981 working in the Alaska Branch with the famous Alaskan geologist Dave Hopkins.  In 1982 he joined the Branch of Paleontology and Stratigraphy where he stayed until the Branches demise in the reorganization of 1994.  Since that time he has worked for the Geology, Minerals, Energy, and Geophysics Science Center on various projects, usually related to geologic hazards, age dating, and paleoenvironmental interpretation. Most recently molluscan systematics have played a larger part in Chuck's career.  

Chuck specializes in Northeast Pacific (Alaska to Mexico) Tertiary and Quaternary molluscan faunas, although he also works with brachiopods, arthropods, echinoids, and other larger invertebrate groups.  

 

 

 

 

Publications:

Scott, G.H., Ingle Jr., J.C., McDane, B., Powell, C.L., II, and Thenell, R.C., 2015, Truncorotalia crassaformis from its type locality: Comparison with Caribbean plankton and Pliocene relatives:  Marine Micropaleontology, doi: 10.1016/j.marmicro.2015.02.001. 

Valentich-Scott, P., Powell, C.L., II, Lorenson, T.D., and Edwards, B.E., 2014, A new genus and species of Thyasiridae (Mollusca, Bivalvia) from deep-water, Beaufort Sea, northern Alaska: ZooKeys 462, p. 11-26. 

Stadum, C.J., and Powell, C.L., II, 2014, Middle Miocene limestone deposits in Saddleback Valley, southeastern Orange County, California [abs.]: 73rd Meeting Society of Vertebrate Paleontologists, Paleontology and geology of Orange County, CA field trip volume, p. *. 

Schmidt, K.M., Minor, S.A., Bedord, D.R., and Powell, C.L., II, 2013, Flights of marine wave-cut platforms on Santa Rosa Island, CA [abs.]:  American Geophyscial Union, San Francisco, CA, December 7-13, 2013, abstract T11D-2487. 

McGann, M., Erikson, L., Wan, E., Powell, C., II, and Maddocks, R.F., 2013, Distribution of biologic, anthropogenic, and volcanic constituents as a proxy for sediment transport in the San Francisco Bay Coastal System: Marine Geology, v. 345, p. 113-142. 

Stanley, R.G., Barron, J.A., Powell, C.L., II, Graymer, R.W., and Brabb, E.E., 2013, Progress toward understanding the stratigraphy and right-lateral displacement of upper Miocene rocks along the San Andreas fault in central California [abs.]: Geological Soceity of America, Abstracts with Program, v. 45, no. 6, p. 16.  

 Powell, C.L., II, 2013, Pliocene fossil mollusks collected from a shrimp trap off San Clemente Island, southern California: The Festivus, v. 45, no. 3, p. 19-23. 

McGann, M., Erikson, L., Wan, E., Powell, C.L., II, and Maddocks, R.F. 2012. Distribution of biologic, anthropogenic, and volcanic constituents as a proxy for sediment transport in the San Francisco Bay coastal system, California [abs.]: 2012 Fall Meeting, American Geophysical Union, San Francisco, CA, December 3-7, 2012, abstract OS21C-1760, http://fallmeeting.agu.org/2012/eposters/eposter/os21c-1760/

Vazquez, J.A., McLaughlin, R.J., Fleck, R.J., DeLong, S.B., Sarna-Wojcicki, A.M., Wan, E., Powell, C.L., II, and Prentice, C.S., 2012, The Ohlson Ranch Formation tuff a well dated stratigraphic marker constraining deformation rates across the San Andreas fault, northern California [abs.]: 2012 Fall Meeting, American Geophysical Union, San Francisco, CA, December 3-7, 2012, Abstract T21D-2603.

Vendrasco, M.J., Eernisse, D.J., Powell, C.L., II, and Fernandez, C.Z., 2012, Polyplacophora (Mollusca) from the San Diego Formation: a remarkable assemblage of fossil chitons from the Pliocene of southern Califoria: Natural History Museum of Los Angeles County, Contributions in Science 520, p. 15-72, http://www.nhm.org/site/sites/default/files/pdf/contrib_science/CS520.15-72.pdf.

McGann, M., Erikson, L., Wan, E., Powell, C.L., II, and Maddocks, R.F. 2012. A multi-constituent approach for analyzing sediment transport in the San Francisco Bay coastal system [abs.]:  7th Biennial Bay-Delta Science Conference, Sacramento, CA, October 16-18, 2012, p. 65, http://scienceconf.deltacouncil.ca.gov/sites/default/files/documents/abstracts/oral/A8SedimentBDSC2012.pdf.

Powell, C.L., II, 2012, An unusual molluscan faunule from the upper part of the Monterey Formation (middle to upper Miocene) in Arroyo Seco, Monterey County, California: Field trip guidebook for the 45th annual meeting of the Western Society of Malacologists jointly with the International Workshop on Opisthobranchs (University of California, Santa Cruz, 24-27 June 2012), 16 unnumbered pages. 

McDougall, K., Hillhouse, J., Powell, C., II, Mahan, S., Wan, E., and Sarna-Wojcicki, A.M., 2012, Paleontology and geochronology of the Long Beach core sites and monitoring wells, Long Beach, California:  U.S. Geological Survey Open-File Report 2011-1274, 235 p., 18 pls., http://pubs.usgs.gov/of/2011/1274

Powell, C.L., II, and LaFollette, P.I., 2012, Preliminary review of the molluscan fauna from the Super Creek exposures of the “Imperial” Formation (late Miocene), north of Palm Springs, Riverside County, California [abs.]:  CalPaleo 2012 abstracts with program, p. 16-17. 

McGann, M., and Powell, C.L., II, 2011, Cordell Bank National Marine Sanctuary sediment yields a diverse micro- and macrofauna [abs.]: Sanctuary Currents Symposium, Monterey Bay National Marine Sanctuary, p. 30-31. 

Powell, C.L., II, Roeder, M., and McDougall, K., 2011, A preliminary report on the paleontology of the Imperial Formation (ancestral Gulf of California; Pliocene) in the Indio Hills, Riverside County, southern California [abs.]: CalPaleo 2011 abstracts with program, p. 22.

Powell, C.L., II, and Stanley, R.G., 2011, Invertebrate paleontology of the Panorama Hills formation of Dibblee (19062), eastern Carrizo Plain, soiuthern San Luis Obispo County, California, and its implications for displacement along the San Andreas fault [abs.]: CalPaleo 2011 abstracts with program, p. 21.

Powell, C.L., II, Valentich-Scott, P., Lorenson, T.D., and Edwards, B.D., 2011, Megafauna recovered from a cold hydrocarbon seep in the deep Alaskan Beaufort Sea, including a new species of Axinus (Thracidae: Bivalvia: Mollusca) [abs.]: American Geophysical Union, Fall Meeting 2011, abstract #PP33A-1917, http://adsabs.harvard.edu/abs/2011AGUFMPP33A1917P.

Powell, C.L., II, Fisk, L.H., Maloney, D.F., and Haasl, D.M., 2010, Biostratigraphy of the San Joaquin Formation in borrow-source area B-17, Kettleman Hills landfill, North Dome, Kettleman Hills, Kings County, California: U.S. Geological Survey Open-File Report 2010-1140, 29 p. and oversized figure, http://pubs.usgs.gov/of/2010/1140/.

Powell, C.L., II, and Stadum, C.J., 2010, Unique middle Miocene limestone deposits assigned to the “Topanga” Formation in southern Orange County, California: its molluscan fauna and geology [abs.]:  Program and abstracts for the joint 76th American Malacological Society and 43rd Western Society of Malacologists annual meeting, June 26-30, 2010, p. 77-78

Powell, C.L., II, and Perry, F., 2009, Biostratigraphy of the northern Monterey Bay section of the Purisima Formation (late Miocene-late Pliocene), Santa Cruz County, California [abs.]:  Abstracts and Program for the 42nd Annual Meeting, June 23-26, 2009, Western Society of Malacologists, unnumbered page.

Powell, C.L., II, Stanton, R.J., Jr., Vendrasco, M., and Liff-Grief, P., 2009, Warm extralimital fossil mollusks used to recognize the mid-Pliocene warm event in southern California:  The Western Society of Malacologists, Annual Report for 2008, v. 41, p. 70-91.

Powell, C.L., II, 2008, Outcrops and mollusks of the “Margaritan” California provincial molluscan stage in the northern Salinas Valley, Monterey and San Benito counties, central California:  PaleoBios, v. 27, no. 3, p. 86-125.  

Powell, C.L., II, 2008, Pliocene invertebrates from the Travertine Point outcrop of the Imperial Formation, Imperial County, California.  U.S. Geological Survey Scientific Investigations Report 2008-5155, 25 p.,http://pubs.usgs.gov/sir/2008/5155/sir2008-5155.pdf

Powell, C.L., II and Groves, L., 2008, Notes on the association of Vesicomyids and Lucinoma (Mollusca: Bivalvia) in southern California:  modern and fossil.  The Festivus, v. 40, no. 5, p. 61-68.

Powell, C.L., II, and McGann, M., 2008, Late Pleistocene mollusks and foraminifers from near Cordell Bank, offshore central California:  their age and environmental significance:  The Festivus, v.40, no. 9, p. 101-114. 

Powell, C.L., II, Stanton, R., and Liff-Grief, P., 2008, The gastropod genus Architectonica (Mollusca) in the Pliocene of California – using warm water mollusks to correlate and date scattered outcrops across central and southern California [abs.]:  Geological Soceity of America, Abstracts with Programs, v. 40, no. 1, p. 41.

Powell, C.L., II, Stanton, R.J., Jr., Liff-Grief, P., 2008, Architctonica (Gastropoda) and associated warm-water mollusks used to correlate and date scattered ourcrops in the Pliocene of south and central California [abs.]:  The Western Society of Malacologists, Annual Report for 2008, v. 41, p. 36.

Ross, S.L., Lee, H.J., Parsons, T.E., Beyer, L.A., Boore, D.M., Conrad, J.E., Edwards, B.D., Fisher, M.A., Frankel, A.D., Geist, E.L., Hudnut, K.W., Hough, S.E., Kayen, R.E., Lorenson, T.D., Luco, BN., McCroy, P.A., McGann, M.L., Natherson, M., Nolan, M., Peterson, M.D., Ponti, D.J., Powell, C.L., II, Ryan, H.F., Tinsley, J.C., Willis, C.J., Wong, F.L., and Xu, J., 2008, Comments on potential geologic and seismic hazards affecting proposed liquefied natural gas site in Santa Monica Bay, California:  U.S. Geological Survey Open-File Report 2008-1344, 66 p., http://pubs.usgs.gov/of/2008/1344/of2008-1344.pdf

Jachens, R.C., McLaughlin, R.J., Graymer, R.W., Simpson, R.W., Powell, C.L., II, and Wentworth, C.M., 2007, Quanitative four-dimensional reconstructions of the central San Andreas Fault and adjacent crust, northern California:  proof of concept along the Santa Cruz Mountains segment [abs.]:  Geological Society of America, Abstracts with Programs, v. 39, no. 6, p. 46.

McLaughlin, R.J., Powell, C.L., II, McDougall-Reid, K., and Jachens, R.C., 2007, Cessation of slip on the Pilarcitos Fault and initiation of the San Francisco Peninsula segment of the (modern) San Andreas Fault, California [abs.]:  Eos, Transactions, American Geophysical Union, v. 88, no. 52, Fall meeting supplement, abstract T43A-1089.

Ponti, D.J., Ehman, K.D., Edwards, B.D., Tinsley, J.C., III, Hildenbrand, T., Hillhouse, J.W., Hanson, R.T., McDougall, K., Powell, C.L., II, Wan, E., Land, M., Mahan, S., and Sarna-Wojcicki, A.M., 2007, A 3-dimensional model of water-bearing sequences in the Dominguez Gap region, Long Beach, California:  U.S. Geological Survey Open-File Report 2007-1013, 32 p., http://pubs.usgs.gov/of/2007/1013

Powell, C.L., II, and Stone, P., 2007, Publications of the Western Earth Surface Team, 2005:  U.S. Geological Survey Open-File Report 2007-1027, 22 p., http://pubs.usgs.gov/of/2007/1027.

Powell, C.L., II, Barron, J.A., Sarna-Wojcicki, A.M., Clark, J.C., Perry, F.A., Brabb, E.E., and Fleck, R.J., 2007, Age, stratigraphy, and correlation of the late Neogene Purisima Formation, central California Coast Ranges:  U.S. Geological Survey Professional Paper 1740, 32 p., http://pubs.usgs.gov/pp/2007/1740/

Powell, C.L., II, and Ponti, D.J., 2007, Paleontologic and stratigraphic reevaluation of Deadman Island, formerly in San Pedro Bay, California, in Brown, A.R., Shlemon, R.J., and Cooper, J.D., eds., Geology and paleontology of Palos Verdes Hills, California:  A 60th anniversary revisit to commemorate the 1946 publication of U.S. Geological Survey Professional Paper 207:  Pacific Section SEPM, book 103, p. 101-120.

Powell, C.L., II, and Stone, P., 2007, Publications of the Western Earth Surface Processes Team 2006:  U.S. Geological Survey Open-File Report 2007-1227, 20 p., http://pubs.usgs.gov/of/2007/1227/

Hein, J.R., Normark, W.R., McIntyre, B.R., Lorenson, T.D., and Powell, C.L., II., 2006.  Methanogenic calcite, 13C-depleted bivalve shells, and gas hydrate from a mud volcano offshore southern California:  Geology, v. 34(2), p. 109-112.

Powell, C.L., II, McLaughlin, R.J., and Wan, E., 2006, Biostratigraphy and lithologic correlations of two Sonoma County Water Agency pilot wells with the type Wilson Grove Formation, Sonoma County, central California. U.S. Geological Survey Open-File Report 2006-1196, 37 p., http://pubs.usgs.gov/of/2006/1196.

Powell, C.L., II, 2005, A preliminary review of California fossil Austrotrophon and Forreria (Gastropoda:  Muricidae:  Ocenebrinae) [abs.]:  Abstracts from joint meeting of 38th annual Western Society of Malacologists and 71st annual American Malacological Society (Pacific Grove, CA.  June 26-30, 2005), p. 94.

Powell, C.L., II, Grant, L.B., and Conkling, S., 2005, Paleoecologic analysis and age of a new late Pleistocene fossil locality in upper Newport Bay, Orange County, California:  The Veliger, v. 47, no. 3, p. 171-180. 

Powell, C.L., II, and Stone, P., 2005, Publications of the Western Earth Surface Team, 2004:  U.S. Geological Survey Open-File Report 2005-1362, 17 p., http://pubs.usgs.gov/of/2005/1362.

Starratt, S.W., Allen, J.R., Peterson, D., Powell, C.L. II, Ruck, E., and Sarna-Wojcicki, A., 2005, New paleontological evidence supporting the Neogene transition from marine to non-marine conditions in Marin and Sonoma counties, California, USA [abs.].  Geological Society of America, Abstracts with Programs, v. 37, no. 4, p. 69.

Hein, J.R., Normark, W.R., Lorenson, T.D., Powell, C.L. II, and McIntyre, B.L., 2004.  Methanogenic carbonate collected with gas hydrate from a mud volcano offshore Southern California.  Abstracts with Program of the 32nd International Geological Congress, 20-28 August, Florence Italy, part 2, p. 1250-1251.

Powell, C.L., II, 2004, Using zoogeographic correlations of marine invertebrate faunas to date late Tertiary and Quaternary deposits [abs.]:  2004 Southern California Earthquake Council meeting (Palm Springs, CA.  September 19-23, 2004), Proceedings and Abstracts, v. XIV, p. 145-146.

Powell, C.L., II, Allen, J.R., and Holland, P.J., 2004, Invertebrate paleontology of the Wilson Grove Formation (late Miocene to late Pliocene), Sonoma and Marin Counties, California, with some observations of its stratigraphy, thickness, and structure.  U.S. Geological Survey Open-File Report 2004-1017, 106 p., http://pubs.usgs.gov/of/2004/1017/

Powell, II, C., Stone, P. and Graymer, R.W., 2004, Publications of the Western Earth Surface Team, 2003:  U.S. Geological Survey Open-File Report 2004-1267, 18 p., http://pubs.usgs.gov/of/2004/1267/.

Vermeij, G.J., and Powell, C.L., II, 2004, Nucella megastoma, a new late Pliocene Muricid gastropod from northern California:  Proceedings of the California Academy of Sciences, v. 55, no. 9, p. 184-189. 

McLaughlin, R.J., Sarna-Wojcicki, A.M., Fleck, R.J., Wagner, D.L., Jachens, R.C., Levin, R.G., Roberts, C.W., Valin, Z.C., Powell, C. L., II, and Allen, J.R., 2003, Framework of the right-stepped Rodgers Creek -  Maacama fault system, northern San Francisco Bay Region, California [abs.]. Geological Society of America Abstracts with Programs ,vol. 35, no. 6, p. *, http://gsa.confex.com/gsa/2003AM/finalprogram/abstract_67177.htm.

Normark, W.R., Hein, J.R., Powell, C.L., II, Lorenson, T.D., Lee, H.J., and Edwards, B.D., 2003, Methane hydrate recovered form a mud volcano in Santa Monica Basin, offshore southern California [abs.].  Eos, Transactions, American Geophysical Union, v. 84, no. 46 (supplement), p. F847. 

Ponti, D.J., Tinsley, J.C., III, Ehman, K.D., Powell, C.L., II, McDougall, K., Hillhouse, J.W., and Edwards, B.D., 2003, Seawater intrusion of producing aquifers in the Long Beach area, California:  insights from new USGS corehole date [abs.]:  Pacific Section, AAPG and Western region, SPE abstract volume, http://www.searchanddiscovery.com/documents/abstracts/spe_aapg2003/index.HTM#P

Powell, C.L., II, and Graymer, R.W., 2003, Publications of the Western Earth Surface Processes Team 2002:  U.S. Geological Survey Open-File Report 03-363, 23 p., http://geopubs.wr.usgs.gov/open-file/of03-363/.

King, T., Cox, B.F., Matti, J.C., Powell, C.L., II, Osterman, L.E., and Bybell, L.M., 2002, Previously unreported outcrops of Neogene Imperial Formation in southern Santa Rosa Mountains, California, and implications for tectonic uplift [abs.]:Geological Society of America Abstracts with Program, v. 34, no. 6, p. 124.

Minor, S A., Kellogg, K.S., Stanley, R.G., Stone, P., Powell, C.L., II, Gurrola, L.D., Selting, A.J., and Brandt, T.R., 2002, Preliminary Geologic Map of the Santa Barbara Coastal Plain Area, Santa Barbara County, California, version 1.0:  U.S. Geological Survey Open-File Report 02-0136, 22 p., scale 1:24,000, http://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-02-0136/.

Minor, S.A., Kellogg, K.S., Stanley, R.G., Stone, P., Powell, C.L., II, Gurrola, L.D., Selting, A.J., and Brandt, T.R., 2002, New geologic map of the Santa Barbara Coastal plain area, southern California, refines understanding of late Cenozoic deformation [abs.]: Geological Society of America Abstracts with Program, v. 34, no. 6, p. 123.

Powell, C.L., II, and Graymer, R.W., 2002, Publications of the Western Earth Surface  Process Team, 2001:  U.S. Geological Survey Open-file Report 02-269, 19 p.

Powell, C.L., II, Stanley, R.G., and Minor, S.A., 2002, Age and paleogeography of the Santa Barbara Formation in Santa Barbara and Goleta Quadrangles, California, based on mollusks [abs.]: Geological Society of America Abstracts with Program, v. 34, no. 6, p. 123.

Brabb, E.E., Powell, C.L., II, and Brocher, T.M., 2001, Preliminary compilation of data for selected oil test wells in northern California:  U.S. Geological Survey OpenFile Report 01-152, 317 p., http://geopubs.wr.usgs.gov/open-file/of01-152.

Ehman, K.D., Ponti, D.J., Clifton, H.E., Edwards, B.D., Fleck, R.J., Hillhouse, J.W., Mahan, S.A., McDougall, K., Powell, C.L., II, and Tinsley, J.C., III, 2001, Quaternary stratigraphy and hydrostratigraphy of the Long Beach area, southwest Los Angeles Basin, CA [abs.]:  Geological Society of American Abstracts with Program, v. 33, no. 3, p. A77.

Powell, C.L., II, 2001, Paleontological notes on Tertiary rocks in the Spreckles 15’ quadrangle, Monterey County, California.  With description of an unusual faunule from the Monterey Formation and a new Lucinid bivalve from the Santa Margarita Formation.  PaleoBios, v. 21, no. 2, p. 15-27. 

Powell, C.L., II, 2001, Geologic and molluscan evidence for a previously misunderstood late Pleistocene, cool water, open coast terrace at Newport Bay, southern California.  The Veliger, v. 44, no. 4, p. 340-347. 

Powell, C.L., II, and Allen, J., 2001, Invertebrate fossils from the Wilson Grove Formation (late Miocene - late Pliocene), Sonoma County, northern California [abs.]. North American Paleontological Convention 2001 Programs and Abstracts, PaleoBios, v. 21, supplement to no. 2, p. 105. 

Powell, C.L., II, Clifton, E., Edwards, B., McDougall, K., Ponti, D.J., Tinsley, J., and Walker, J., 2001, Quaternary framework of the Los Angeles Basin:  sedimentary environments of the Long Beach area [abs.]:  Geological Society of America Abstracts with Program, v. 33, no. 3, p. A77.

Powell, C.L., II, Lajoie, K., Ponti, D.J., and Appel, S., 2001, Deadman Island revisited:  the Quaternary of the Los Angeles basin based on molluscan faunas [abs.]:  Geological Society of America Abstracts with Program, v. 33, no. 3, p. A54.

 Powell, C.L., II and Stone, P., 2001, Publications of the Western Earth Surface Processes Team, 2000:  U.S. Geological Survey Open-file Report 01-198: 19 p., http://geopubs.wr.usgs.gov/open-file/of01-198

Quinn, J.P., Ponti, D.J., Hillhouse, J.W., Powell, C.L., II, McDougall, K., Sarna-Wojcicki, A.M., Barron, J.A., and Fleck, R.J., 2001, Quaternary deformation rates constrain blind fault activity, northern Los Angeles Basin, California [abs]: Geological Society of America Abstracts with Program, v. 33, no. 3, p. A69. 

Powell, C.L., II, 2000, Age and paleoenvironment suggested by mollusks from the Purisima Formation and related rocks (late Miocene – Pliocene), San Francisco Bay area, central California:  Western Society of Malacologists, Annual Report, v. 32, p. 20-22.

Powell, C.L., II, Lajoie, K., and Ponti, D., 2000, A preliminary chronostratigraphy based on molluscan biogeography for the late Quaternary of southern California:  Western Society of Malacologists, Annual Report, v. 32, p. 23-36.

Powell, C.L., II, and Stevens, D., 2000, Significance of macrofossils from the “San Pedro” Formation, Coyote Hills, Orange County, southern California:  Western Society of Malacologists, Annual Report, v. 32, p. 36-41.

Powell, C.L., II, and Stevens, D., 2000, Age and paleoenvironmental significance of mega-invertebrates from the “San Pedro” Formation in the Coyote Hills, Fullerton and Buena Park, Orange County, southern California.  U.S. Geological Survey Open-file Report 00-319, 83 p., http://geopubs.wr.usgs.gov/open-file/of00-319

Stone, P. and Powell, C.L., II, 2000, Publications of the Western Earth Surface Processes Team, 1999.  U.S. Geological Survey Open-file Report 00-215, 19 p. 

Powell, C. L., II, 1999, Biostratigraphy of the “Purisima” Formation in the San Francisco Bay area, central California [abs.].  A.A.P.G., S.E.P.M., S.E.G., S.P.W.LA., 1999 Pacific section convention (Seaside, CA), convention program:  40.

Powell, C. L., II, Ponti, D., and Lajoie, K., 1999. A preliminary chronostratigraphy for the late Quaternary of southern California based on molluscan biogeography [abs.].  Fullerton, Calif.  Western Society of Malacologists, 1999 Abstract with Program, unnumbered page.

Powell, C. L., II, and Stevens, D., 1999. Age and paleoenvironmental significance of mollusks from the “San Pedro” Formation, Coyote Hills, Orange County, southern California [abs.].  Fullerton, Calif.  Western Society of Malacologists, 1999 Abstract with Program, unnumbered page.

Stone, P., and Powell, C. L., II, 1999, Publications of the Western Geologic Mapping Team, 1997-1998.  U. S. Geological Survey Open-file Report 99-302, 27 p.

Powell, C. L., II, 1998, The Purisima Formation and related rocks (upper Miocene - Pliocene), greater San Francisco Bay area, central California.  Review of literature and USGS collections (now housed at the Museum of Paleontology, University of California, Berkeley).  U. S. Geological Survey Open-file Report 98-594, 102 p., http://wrgis.wr.usgs.gov/open-file/of98-594/

Elder, W. P., Saul, L. R., and Powell, C. L., II, 1998, Late Cretaceous and Paleogene molluscan fossils of the Gualala Block and their paleogeographic implications.  In Elder, W. P., ed., Geology and tectonics of the Gualala Block, northern California:  Pacific Section, SEPM Book 84, p. 149-168.

Bukry, D., Brabb, E., Powell, C.L., II, Jones, D., and Graymer, R., 1998, Recent Tertiary and Cretaceous Nannoplankton collections from the San Francisco Bay region.  U. S. Geological Survey Open-file Report 98-497, 27 p.

Powell, C. L., II, 1997, A record of the inarticulate Brachiopod genus Glottidia in the ancestral Gulf of California.  U. S. Geological Survey Open-file Report 97-538:  1-5. 

Quinn, J. P., Point, D. J., Hillhouse, J. W., and Powell, C. L., II, 1997, Quaternary chronostratigraphic constraints on deformation and blind thrust faulting, northern Los Angeles Basin.  In Quinn, J. P., Collaborative research (Gorian and Associates, Inc. and United States Geological Survey):  Geological investigations to evaluate the Wilshire fault blind thrust model.  Final Technical Report, 1434-95-G-2523 (Program Element II, Component II.5):  31 p.

Ponti, D. J., Quinn, J. P., Hillhouse, J. W., and Powell, C. L., II, 1996, Quaternary chronostratigraphic constraints on deformation and blind-thrust faulting, northern Los Angeles Basin [abs.].  Eos, Transactions of the American Geophysical Union, 77(46):  F644. 

Powell, C. L., II and Mooi, R., 1996, Echinodermata of the Miocene and Pliocene Imperial Formation of southern California [abs.].  Program and Abstracts, 9th International Echinoderm Conference (August 5 to 9, 1996  San Francisco, CA):  105.  (Also printed in Mooi, R. and Telford, M., eds., Echinoderms:  San Francisco.  Proceedings of the ninth International Echinoderm Conference, San Francisco, CA, 5-9 August 1996:  71).

Powell, C. L., II, 1995, Preliminary report on the Echinodermata from the Miocene and Pliocene of the Coyote Mountains, southern California.  In Remeika, Paul and Sturz, Anne, eds., Paleontology and geology of the western Salton Trough detachment, Anza-Borrego Desert State Park, California (Field trip guidebook and volume for the 1995 San Diego Association of Geologist’s field trip to Anza-Borrego Desert State Park), 1: 55-63. 

Lajoie, K. R., Ponti, D. J., and Powell, C. L., II, 1995, Amino-stratigraphic correlations of surface and subsurface marine Pleistocene sediments in the western Los Angeles Basin [abs.].  Diversity in Engineering Geology and Groundwater Resources, AEG-GRA 1995 Annual Meeting (Sacramento, CA): 65. 

Powell, C. L., II, 1995, Paleontology and significance of the Imperial Formation at Garnet Hill, Riverside County, California.  U. S. Geological Survey Open-file Report 95-489: 1-10.

Rymer, M. J., Powell, C. L., II, Sarna-Wojcicki, A. M., and Barron, J. A., 1995, Late Miocene stratigraphic and paleogeographic setting of Garnet Hill in the northwestern Salton Trough, southern California [abs.].  A.A.P.G., S.E.P.M., S.E.G., A.E.G., S.P.W.L.A., D.P.A., D.E.G., E.M.D., A.W.G, 1995 Pacific Section convention (San Francisco, CA), schedule and abstracts: 43. 

Tucker, A. B., Feldmann, R. M., Powell, C. L., II, 1994, A new late Miocene crab, Speocarcinus berglundi n. sp. (Decapoda: Brachyura), from the Imperial Formation (late Miocene to late Pliocene) of Riverside County, southern California. Journal of Paleontology, 68(4): 800-807. 

Powell, C. L., II, 1994, Molluscan evidence for a late Pleistocene sea level lowstand from Monterey Bay, central California.  The Veliger, 37(1): 69-80. 

Rymer, M. J., Sarna-Wojcicki, A. M., Powell, C. L., II, and Barron, J. A., 1994, Stratigraphic evidence for late Miocene opening of the Salton Trough in southern California [abs.]. Geological Society of America Abstracts with Programs, 26(2): 87.

McDougall, Kristin, Powell, C. L., II, Matti, J. C., and Poore, R. Z., 1994, The Imperial Formation and the opening of the ancestral Gulf of California [abs.].  Geological Society of America Abstracts with Programs: 26(2): 71.

Powell, C. L., II, 1993, Macrofossils from the Imperial Formation in the Ocotillo Wells State Vehicle Recreation area, Imperial and San Diego counties, California.  U. S. Geological Survey Open-file Report 93-562: 1-7.

Powell, C.L., II, McGann, M., and Trimble, D.A., 1992, Molluscan and foraminiferal evidence of a late Pleistocene sea level lowstand at Cordell Bank, central California:  Eos, Transactions, American Geophysical Union, v. 73, no. 43, Fall Meeting Supplement, p. 273-274.

Powell, C. L., II and McGann, Mary, 1991, Molluscan and foraminiferal evidence of a late Pleistocene sea level lowstand in Monterey Bay, central California [abs.].  1991 Fall Meeting, Program and Abstracts, American Geophysical Union(December 9-13, 1991; San Francisco, CA): 266. 

Lajoie, K. R., Ponti, D. J., Powell, C. L., II, Mathieson, S. A., and Sarna-Wojcicki, A. M., 1991, Emergent marine strandlines and associated sediments, coastal California:  a record of Quaternary sea-level fluctuations, vertical tectonic movements, climatic changes, and coastal processes.  In Morrison, R. B., ed., Quaternary geology of the Pacific margin; Quaternary nonglacial geology: conterminous U. S. (volume K-2).  The Geology of North America.  The Geological Society of America (Boulder, Colorado): p. 190-213.  

Marincovich, L., Jr., and Powell, C. L., II, 1991, Pliocene and Pleistocene molluscs in marine transgressions of western and northern Alaska.  Western Society of Malacologists Annual Report, 23: 10-14.

Marincovich, L., Jr., and Powell, C. L., II, 1991, Comments and Reply on "High-latitude application of 87Sr/86Sr: Correlation of Nuwok beds on North Slope, Alaska, to standard Oligocene chronostratigraphy."  Geology, 19(5): 537-539.

Ponti, D. J., Lajoie, K. R., and Powell, C. L., II, 1991, Upper Pleistocene marine terraces in San Pedro, southwestern Los Angeles Basin, California: implications for aminostratigraphy and coastal uplift [abs.]. Geological Society of America Abstracts with Programs, 23(2): 89.

Marincovich, L. Jr., and Powell, C. L., II, 1989, Preliminary Tertiary molluscan biostratigraphy of the Alaska Peninsula, southwestern Alaska.  U. S. Geological Survey Open-file Report 89-674: 2 oversize sheets.

Squires, R. L., Cox, B. F., and Powell, C. L., II, 1988, Late Paleogene or early Eocene mollusks from the uppermost part of the Goler Formation, California.  In Filewicz, M. V. and Squires, R. L., eds., Paleogene Stratigraphy, West Coast of North America.  Pacific Section, Society of Economic Paleontologists and Mineralogists, West Coast Paleogene Symposium, 58: 183-187.

Powell, C. L., II, 1988, The Miocene and Pliocene Imperial Formation of southern California and its molluscan fauna: an overview.  Western Society of Malacologists Annual Report, 20: 11-18.

Powell, C. L., II, 1987, Correlation between sea-level events and deposition of marine sediments in the proto-Gulf of California during the Neogene [abs.].  Geological Society of America Abstracts with Programs, 19(7): 809.

Powell, C. L., II, 1987, Paleogeography of the Imperial Formation and timing of the opening of the Gulf of California [abs.].  Abstract Volume, Fourth International Congress on Pacific Neogene Stratigraphy: 84.

Powell, C. L., II, 1985, Bivalve molluscan paleoecology of northern exposures of the marine Neogene Imperial Formation in Riverside County, California.  Western Society of Malacologists Annual Report, 17: 29-32 (reprinted in Shells and Sea Life, 17(9): 211-213, 1986). 

Powell, C. L., II and Chin, J. L., 1984, Faunal evidence for a late Wisconsin sea-level low stand, Monterey Bay outer shelf, central California [abs.].  Abstracts, Society of Economic Paleontologists and Mineralogists Annual Midyear Meeting: 66.

Hopkins, D. M., Pratt, R. N., Nelson, R. E., and Powell, C. L., II, 1983, Glacial sequences, southwestern Seward Peninsula.  In Thorson, R. M., and Hamilton, T. D., editors, Glacial in Alaska:  Extended abstracts for a workshop.  Alaska Quaternary Center, University of Alaska Museum, Occasional Paper 2: 45-50.

Powell, C. L., II, 1983, Stratigraphy and bivalve molluscan paleontology of the Neogene Imperial Formation in Riverside County, California.  Program and Abstracts, 58th Annual Meeting, Pacific Section, American Association of Petroleum Geologists-Society of Economic Paleontologists and Mineralogists: 125.

Powell, C. L., II, 1971, Sharktooth Hill, part 2.  Bulletin of the Southern California Paleontological Society, 3(8): 1-3, 7.

Powell, C. L., II, 1971, Sharktooth Hill, part 1.  Bulletin of the Southern California Paleontological Society, 3(7): 5-6, 10.