Geoscience Reference
In-Depth Information
16. Upchurch, G. R. J. (1989). Terrestrial Environmental Changes and
Extinction Patterns at the Cretaceous-Tertiary Boundary, North
America. Mass Extinctions; Processes and Evidence, ed. S. K. Donovan.
New York: Columbia University Press, pp. 195-216.
17. Clemens, W. A., J. D.Archibald, et al. (1981). "Out With a Whimper Not
a Bang." Paleobiology 7(3): 293-298. (p. 297)
18. Hickey, L. J. (1981). "Land Plant Evidence Compatible with Gradual,
Not Catastrophic, Change at the End of the Cretaceous." Nature 292:
529-531. (p. 529)
19. Orth, C. I, J. S. Gilmore, et al. (1981). "An Iridium Abundance Anomaly
at the Palynological Cretaceous-Tertiary Boundary in Northern New
Mexico." Science 214: 1341-1343.
20. Johnson, K. R., and L. J. Hickey (1990). Patterns of Megafloral Change
Across the Cretaceous-Tertiary Boundary in the Northern Great Plains
and Rocky Mountains. Global Catastrophes in Earth History, eds. V. L.
Sharpton and P. D. Ward. Boulder, Colo.: Geological Society of America.
(Special Paper 247: 433-444.)
21. Ibid. (p. 433)
22. Kerr, R. A. (1991). "Dinosaurs and Friends Snuffed Out?" Science 251:
160-162. (p. 162)
23. Johnson, K. R. (1995). "One Really Bad Day." Denver Museum of Natural
History Quarterly Spring 1995: 2-5. (p. 3)
24. Archibald, J. D. (1996). Dinosaur Extinction and the End of an Era: What
the Fossils Say. New York: Columbia University Press, (p. 180)
25. Johnson, K. R. (1997). Personal communication.
26. Thierstein, H. (1982). Terminal Cretaceous Plankton Extinctions:
A Critical Assessment. Geological Implications of Impacts of Large
Asteroids and Comets on the Earth, eds. L. T. Silver and P. H. Schultz.
Boulder, Colo.: Geological Society of America. (Special Paper 190:
385-399.)
27. Smit, J. (1982). Extinction and Evolution of Planktonic Foraminifera
After a Major Impact at the Cretaceous/Tertiary Boundary. Geological
Implications of Impacts of Large Asteroids and Comets on the Earth, eds.
L. T. Silver and P. H. Schultz. Boulder, Colo.: Geological Society of
America. (Special Paper 190: 329-352.)
28. Keller, G., and E. Barrera (1990). The Cretaceous/Tertiary Boundary
Impact Hypothesis and the Paleontological Record. Global Catastrophes in
Earth History, eds. V. L. Sharpton and P. D. Ward. Boulder, Colo.: Geologi-
cal Society of America. (Special Paper 247: 563-575.) (pp. 563, 566)
29. Fischer, A. (1996). Personal communication.
30. Kerr, R. (1994). "Testing an Ancient Impact's Punch." Science 263:
1371-1372. (p. 1371)
31. Ibid. (pp. 1371-1372)
32. Ibid. (p. 1372)
33. Keller, G. (1994). "K-T Boundary Issues." Science 264: 641.
34. Ibid. (p. 641)
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