The End of the Cretaceous: Sharp Boundary or Gradual Transition?

Evidence indicates that the Cretaceous-Tertiary boundary is very sharp, and, within the limits of resolution, it is apparently synchronous at the various boundary localities. Arguments to the contrary, particularly those of Officer and Drake, are shown to be invalid.

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Bibliographische Detailangaben
Veröffentlicht in:	Science (American Association for the Advancement of Science) 1984-03, Vol.223 (4641), p.1183-1186
Hauptverfasser:	Alvarez, W., Alvarez, L. W., Asaro, F., Michel, H. V.
Format:	Artikel
Sprache:	eng
Schlagworte:	ASTEROIDS BOUNDARY CONDITIONS CENOZOIC ERA Collisions (Physics) Cretaceous CRETACEOUS PERIOD Dinosaurs Drilling ECOLOGICAL CONCENTRATION ELEMENTS GEOLOGIC AGES GEOLOGIC HISTORY Geological research Geology Geology, Stratigraphic GEOSCIENCES impact IMPACT SHOCK IRIDIUM Magnetic polarity Mass extinction Mass extinction events Mass extinction theory MESOZOIC ERA METALS Natural history Observations PLATINUM METALS Species extinction Stratigraphy TERTIARY PERIOD TRANSITION ELEMENTS 580100 > Geology & Hydrology-- (-1989) VARIATIONS
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Beschreibung
Zusammenfassung:	Evidence indicates that the Cretaceous-Tertiary boundary is very sharp, and, within the limits of resolution, it is apparently synchronous at the various boundary localities. Arguments to the contrary, particularly those of Officer and Drake, are shown to be invalid.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.223.4641.1183