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2 edition of K-Tec 2 Cretaceous-Tertiary Extinctions and Possible Terrestrial and Extraterrestrial Causes found in the catalog.

K-Tec 2 Cretaceous-Tertiary Extinctions and Possible Terrestrial and Extraterrestrial Causes

National Museum of Canada. National Museum of Natural Sciences.

K-Tec 2 Cretaceous-Tertiary Extinctions and Possible Terrestrial and Extraterrestrial Causes

Proceedings of the Workshop Held in Ottawa, Canada 19-20 May 1981.

by National Museum of Canada. National Museum of Natural Sciences.

  • 242 Want to read
  • 14 Currently reading

Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesCanada National Museum of Natural Sciences Syllogeus -- 39
ContributionsRussell, D., Rice, G.
ID Numbers
Open LibraryOL21884595M

The Cretaceous–Tertiary extinction event, now called the Cretaceous–Palaeogene extinction event. It may be called the K/T extinction event or K/Pg event for short. This is the famous event which killed the dinosaurs at the end of the Cretaceous period.   The Cretaceous–Paleogene (K–Pg) extinction event, formerly known as the Cretaceous–Tertiary (K–T) extinction, was a mass extinction of some three-quarters of plant and animal species on.

@article{osti_, title = {What caused the mass extinction An extraterrestrial impact}, author = {Alvarez, W and Asaro, F}, abstractNote = {The authors and other investigators discovered iridium in the clays that mark the sudden disappearance of dinosaurs from the fossil record. Because iridium is rare in the earth's crust but abundant in some meteorites, they concluded that a giant. The Cretaceous-Tertiary extinction, the most famous of the Big Five, has been attributed to what major event(s) that triggered the extinction of the -

K-T extinction, abbreviation of Cretaceous-Tertiary extinction, also called K-Pg extinction or Cretaceous-Paleogene extinction, a global extinction event responsible for eliminating approximately 80 percent of all species of animals at or very close to the boundary between the Cretaceous and Paleogene periods, about 66 million years ago. The Tertiary Period ( to Ma) is the informal name for the geological period that followed the K-T extinction event. So the K-T event happened before the Tertiary.


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K-Tec 2 Cretaceous-Tertiary Extinctions and Possible Terrestrial and Extraterrestrial Causes by National Museum of Canada. National Museum of Natural Sciences. Download PDF EPUB FB2

Cretaceous-Tertiary Extinctions and Possible Terrestrial and Extraterrestrial Causes. [By The K - Tec Group, Beland, Pierre Et All] on *FREE* shipping on qualifying offers. Cretaceous-Tertiary Extinctions and Possible Terrestrial and Extraterrestrial Causes.

K-TEC II, Cretaceous-Tertiary extinctions and possible terrestrial and extraterrestrial causes: proceedings of the workshop held in Ottawa, CanadaMay [Dale A. syllogeus: no. cretaceous-tertiary extinctions and possible terrestrial and extraterrestrial causes. [no author.] on *free* shipping on qualifying offers.

syllogeus: no. cretaceous-tertiary extinctions and possible terrestrial and extraterrestrial causes. Get this from a library. Cretaceous-Tertiary extinctions and possible terrestrial and extraterrestrial causes.

[K-TEC Group.; National Museum of Natural Sciences (Canada). Paleobiology.; Herzberg Institute of Astrophysics.; National Research Council of Canada.]. The KTB mass extinction differs from the other four major mass extinctions in that it occurred after the longest period (– Ma) with the lowest background extinctions (2).Throughout the Cretaceous, generic diversity steadily increased, accelerating.

Extraterrestrial Cause for the Cretaceous-Tertiary Extinction We must note, finally, an aspect of the biological record which, on the face of it, is not in accord with the asteroid-impact hypothesis, or with any sudden, violent by:   The K-T Extinction divides the Cretaceous Period, which ended the Mesozoic Era, and the Tertiary Period at the start of the Cenozoic Era, which we currently live in.

The K-T Extinction happened around 65 million years ago, taking out an estimated 75% of Author: Heather Scoville. Among the hypotheses 2,5–9 proposed for the extinctions is that they were caused by ionizing radiations 2,8,9.

The hypothesis proposed here is Cited by: 5. Cretaceous/Tertiary Extinction. The mass extinction event that occurred about 65 million years ago brought about an end to the domination of the planet by reptiles and, in so doing, opened up ecological niches within which mammals flourished several million years.

Title: Extraterrestrial Cause for the Cretaceous-Tertiary Extinction Created Date: Z. Platinum metals are depleted in the earth's crust relative to their cosmic abundance; concentrations of these elements in deep-sea sediments may thus indicate influxes of extraterrestrial material.

Deep-sea limestones exposed in Italy, Denmark, and New Zealand show iridium increases of aband 20 times, respectively, above the background level at precisely the time of the Cited by:   The bolide impact theory for mass extinctions at the Cretaceous-tertiary (K-T) boundary was a revolutionary concept.

This theory was contested by short duration global volcanism as a possible alternative cause for the K-T extinction. Though there is a converging evidence for an extra-terrestrial impact coinciding with the terminal Cretaceous, the causative link between the impact and the K-T Cited by: 4.

/ CRETACEOUS -TERTIARY EXTINCTIONS AND POSSIBLE TERRESTRIAL AND EXTRATERRESTRIAL CAUSES, K-TEC GROUP, In: Syllogeous No. 39, Proceedings of a workshop held in Ottawa, May,pb, pages, - 2 - $ Russell DA () The biotic crisis at the end of the Cretaceous Period.

In: K-TEC, Cretaceous-Tertiary extinctions and possible terrestrial and extraterrestrial causes, eds Beland P et al. Ottawa: National Museum of Natural Sciences Syllogeus No 12, pp 11–24 Google ScholarCited by: The End-Cretaceous mass extinction has generated considerable public interest in recent years, in response to the controversial debates in the scientific community over its cause.

The more prominent of these new hypoteses invoke extra-terrestrial forces, such as meteorite impacts or comet showers as the causative extinction agent. The K-T extinctions were a global event, so we should examine globally effective agents: geographic change, oceanographic change, climatic change, or an extraterrestrial event.

The most recent work on the K-T extinction has centered on two hypotheses that suggest a violent end to the Cretaceous: a large asteroid impact and a giant volcanic.

Extraterrestrial cause for the cretaceous-tertiary extinction. Alvarez LW, Alvarez W, Asaro F, Michel HV. Platinum metals are depleted in the earth's crust relative to their cosmic abundance; concentrations of these elements in deep-sea sediments may thus indicate influxes of extraterrestrial Cited by: Extraterrestrial Cause for the Cretaceous-Tertiary Extinction Author(s): Luis W.

Alvarez, Walter Alvarez, Frank Asaro and Helen V. Michel Source: Science, New Series, Vol.No. (Jun. 6, ), pp. Extraterrestrial Cause for the Cretaceous-Tertiary Extinction.

Interesting Cretaceous–Tertiary Extinction Event Facts: 1. The Cretaceous-Tertiary extinction event (abbreviated as K-T extinction) is also known as the Cretaceous-Paleogene extinction event (abbreviated as K-Pg extinction). This event was responsible for wiping out 3/4 th of all animal and plant species that lived on Earth during that period.

The K-T extinction Substantial evidence supports an extra-terrestrial impact at the K-T boundary, but the causes, timing, and extent of the associated mass extinction remain unclear. The K-T boundary section in northeastern Montana is a standard for examining patterns in the terrestrial realm, but few studies have examined the biotic changes at ecologically relevant spatial and temporal scales.

Extraterrestrial Cause for the Cretaceous-Tertiary Extinction.Extraterrestrial cause for the Cretaceous-Tertiary extinction. Science–) The effects of such an impact would be a persistent ‘winter’ in which species perished, including on land non-avian dinosaurs, many mammals, pterosaurs, birds, lizards, insects and plants, and at sea plesiosaurs, giant marine lizards, many fish, sharks.The Cretaceous – Tertiary Boundary (K-T) Extinction caused the loss of at least three-quarters of all species known at that time including the dinosaurs.

The cause of this mass extinction is a controversial subject among scientists but the fossil evidence of it’s occurrence is abundant. INTRODUCTION The K-T Extinction occurred 65 million.