Chicxulub Structure: A Volcanic Sequence of Late Cretaceous Age
1994 ◽
Vol 7
◽
pp. 425-436
Keyword(s):
The present Cretaceous/Tertiary extinction debate started with findings by Alvarez et al. (1980) of enhanced levels of iridium at K/T sections in Italy, Denmark and New Zealand. They postulated that the iridium was extraterrestrial in origin and related to a 10 km diameter asteroid impact which would have produced a crater some 200 km in diameter. They further suggested that a giant dust cloud would have been injected into the stratosphere from the impact with a residence time of several years and that the resulting darkness would have suppressed photosynthesis with a consequent elimination of succeeding members in the biological food chain — ergo, a mass extinction event.
2018 ◽
Vol 230
◽
pp. 17-45
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2000 ◽
Vol 74
(4)
◽
pp. 701-711
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1986 ◽
Vol 60
(1)
◽
pp. 107-115
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2021 ◽
1999 ◽
Vol 9
(2)
◽
pp. 147-154
◽
2019 ◽
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