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20. Crocket, J. H., C. B. Officer, et al. (1988). "Distribution of Noble Metals
Across the Cretaceous/Tertiary Boundary at Gubbio, Italy: Iridium
Variation as a Constraint on the Duration and Nature of
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21. Rocchia, R., D. Boclet, et al. (1990). "The Cretaceous-Tertiary Boundary
at Gubbio Revisited: Vertical Extent of the Iridium Anomaly." Earth and
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22. Alvarez, W., and E Asaro (1990). "An Extraterrestrial Impact." Scientific
American 263: 78-84.
23. Ginsburg, R. N. (1995). Personal communication.
24. Anbar, A. D., G. J. Wasserburg, et al. (1996). "Iridium in Natural Waters."
Science 273: 1524-1528.
25. Kerr, R. A. (1987). "Asteroid Impact Gets More Support." Science 236:
666-668. (p. 668)
26. Officer, C. B., and C. L. Drake (1985). "Terminal Cretaceous
Environmental Events." Science 227: 1161-1167. (p. 1164)
27. Izett, G. A. (1990). The Cretaceous/Tertiary Boundary Interval, Raton
Basin, Colorado and New Mexico, and Its Content of Shock-Metamorphosed
Minerals. Boulder, Colo.: U.S. Geological Survey.
28. Ibid. (p. 1164)
29. Ibid. (p. 1164)
30. French, B. M., and N. W. Short, Eds. (1968). Shock Metamorphism of
Natural Materials. Baltimore: Mono Book Corporation.
31. French, B. M. (1985). "Cretaceous-Tertiary Extinctions: Alternative
Models." Science 230: 1293-1294. (p. 1293)
32. Carter, N. L., C. B. Officer, et al. (1986). "Dynamic Deformation of
Volcanic Ejecta from the Toba Caldera: Possible Relevance to
Cretaceous/Tertiary Boundary Phenomena." Geology 14: 380-383.
33. Bohor, B., P. J. Modreski, et al. (1987). "Shocked Quartz in the
Cretaceous-Tertiary Boundary Clays: Evidence for a Global
Distribution." Science 236: 705-709.
34. Alexopoulos, J. S., R. A. F. Grieve, et al. (1988). "Microscopic Lamellar
Deformation Features in Quartz: Discriminative Characteristics of Shock-
Generated Varieties." Geology 16: 796-799.
35. Kerr, R. A. (1987). "Asteroid Impact Gets More Support." Science 236:
666-668. (p. 667)
36. Ibid. (p. 667)
37. Carter, N. L., and C. B. Officer (1989). "Comment and Reply on Micro-
scopic Lamellar Deformation Features in Quartz: Discriminative Charac-
teristics of Shock-Generated Varieties." Geology 17: 477-478. (p. 477)
38. Kerr, R. A. (1987). "Asteroid Impact Gets More Support." Science 236:
666-668. (p. 666)
39. Officer, C. B., and N. L. Carter (1991). "A Review of the Structure,
Petrology, and Dynamic Deformation Characteristics of Some Enigmatic
Terrestrial Structures." Earth-Science Reviews 30: 1-49. (p. 1)
40. Ibid. (p. 18)
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