238 THE FLORIDA ANTHROPOLOGIST 2006 VOL. 59(3-4) 1995 Eruption of a Major Holocene Pyroclastic Flow at | Citlaltépetl Volcano (Pico de Orizaba), Mexico, 8.5-9.0 Ka. Journal of Volcanology and Geothermal Research. 69:197-215. Chesley, J., J. Ruiz, K. Righter, L. Ferrari, and A. Gomez-Tuena 2002 Source Contamination Versus Assimilation: An Example from the Trans-Mexican Volcanic Arc. Earth and Plane- tary Science Letters 195:211-221. Church, B.N., and W. M. Johnson 1980 Calculation of the Refractive Index of Silicate Glasses from Chemical Composition. Geological Society of Amer- ica Bulletin 91:619-625. Daly, R.A., G.E. Manger, and S.P. Clark 1966 Density of Rocks. Geological Society of America Memoir 97:19-26. Dennis, J.V. 2000 The Lucky Bean: The Drifting Seed, v. 6, p. 6-7 [avail- able at URL http:/Avww.seabean.com newsletter/vol06- 1.pdf Dixon, J.E., K. Simons, L. Leist, C. Eck, J. Ricisak, J. Gifford, and J. Ryan 2000 Provenance of Stone Celts from the Miami Circle Archae- ological Site, Miami, Florida. The Florida Anthropologist §3:328-341. Donovan, 8.K. 1999 Pumice and Pseudoplankton: An Example from the Carib- bean: Caribbean Journal of Science 35:323-324. | Edgar, C.J., J.A. Wolff, H.J. Nichols, R.F. Cas, and J. Marti 2002 A Complex Quaternary Ignimbrite-Forming Phonolitic Eruption: The Poris Member of the Diego Hernandez Formation (Tenerife, Canary Islands): Journal of Volca- nology and Geothermal Research 118:99-130. Ferria, H. and G.A. Manhood 1987 Strong Compositional Zonation in a Silicic Magmatic System: Los Humeros, Mexican Neovolcanic Belt: Jour- nal of Petrology 28:171-209. Fisher, R.V., and H.-U. Schmincke 1984 Pyroclastic Rocks. Springer-Verlag, New York. Gill, .B 1981 Orogenic Andesites and Plate Tectonics., Springer- Verlag, New York. Guest, J.E., J.L. Gaspar, P.D. Cole, G. Queroz, A.M. Duncan, N. Wallenstein, T.A. Terriera, and J.-M. Pacheco 1999 = Volcanic Geology of Furnas Volcano, San Miguel, Azores. Journal of Volcanology and Geothermal Re- search 92:1-29. Gunn, B.M., M.J. Roobol, and A.L. Smith 1980 Geochemistry of Volcanoes of Basse Terre, Guadeloupe; An Example of Intra-Island Variation: Bulletin Volcanologique 43:403-412. Hildreth, W. 1981 Gradients in Silicic Magma Chambers: Implications for Lithospheric Magmatism. Journal of Geophysical Re- search 86:10153-10192. Héskuldsson, A. and C. Robin 1993 _ Late Pleistocene to Holocene Eruptive Activity of Pico de Orizaba, eastern Mexico. Bulletin of Volcanology $5:571- 587. Huh, O.K., J.J. Wiseman, Jr., and L.J. Rouse, Ir. 1981 Intrusion of Loop Current Waters onto the West Florida Continental Shelf. Journal of Geophysical Research 86:4186-4192. Irvine, T.N., and W.A. Baragar 1971 A Guide to the Chemical Classification of the Common Volcanic Rocks. Canadian Journal of Earth Science 8:523-548. Jackson, T.A., P-W. Scott, and A.R. Butcher 2002 The Petrology and Industrial Mineral Potential of Pumice from St. Lucia and Dominica: 16th Caribbean Geological Conference, p. 12. Lacasse, C., and C.-D. Garbe-Schénberg 2001 Explosive Silicic Volcanism in Iceland and Jan Mayan Area During the Last 6 Ma: Sources and Timing of Major Eruptions. Journal of Volcanology and Geothermal Re- search 107:113-147. LeBas, M.M., R.W. Le Maitre, A. Streckeisen, and B. Zanetitin 1986 A Chemical Classification of Volcanic Rocks Based on the Total Alkali-Silica Diagram. Journal of Petrology 27: 745-750. Le Maitre, R.W. (editor) 2002 Igneous Rocks: a Classification and Glossary of Terms: Cambridge University Press, London. MacDonald, R., D.W. McGravie, H. Pinkenton, R.L. Smith, and Z.A. Palacz 1990 _— Petrogenetic Evolution of the Torfajékuil Volcanic Com- plex, Iceland I. Relationship between the Magma Types. Journal of Petrology 31:429-459. MacDonald, R., C.J. Hawkesworth, and E. Heath 2000 The Lesser Antilles Volcanic Chain: A Study in Arc Magmatism. Earth-Science Reviews 49:1—76. McKee, E.H. 1968 Refractive Index of Glass Beads Distinguishes Tertiary basalts in the Grays River Area, Southwestern Washing- ton. U. 8. Geological Survey Professional Paper 600-C, pp. C27-C30 Manville, V., J. L. White, B.F. Houghton, and C.N. Wilson 1998 The Saturation Behaviour of Pumice and some sedimentological implications. Sedimentary Geology 119:5-16, Middlemost, E.K. 1989 _ Iron Oxide Ratios, Norms and the Classification of Volca- nic Rocks, Chemical Geology 70-19-26. Nelson, S.A., E. Gonzalez-Caver, and T.K. Kyser 1995 _ Constraints on the Origin of Alkaline and Calc-Alkaline