K-TEC II, Cretaceous-Tertiary extinctions and possible terrestrial and extraterrestrial causes

proceedings of the workshop held in Ottawa, Canada 19-20, May 1981 by K-TEC Group.

Publisher: National Museums of Canada, National Museum of Natural Sciences in Ottawa

Written in English
Published: Pages: 151 Downloads: 432
Share This

Subjects:

  • Paleontology -- Cretaceous -- Congresses.,
  • Paleontology -- Tertiary -- Congresses.,
  • Cretaceous-Tertiary boundary -- Congresses.,
  • Extinction (Biology) -- Congresses.,
  • Geophysics -- Congresses.,
  • Comets -- Congresses.,
  • Iridium -- Congresses.

Edition Notes

Other titlesK-TEC two, cretaceous-tertiary extinctions and possible terrestrial and extraterrestrial causes.
Statementby the K-TEC Group ; edited by D.A. Russell and G. Rice.
SeriesSyllogeus,, no. 39
ContributionsRussell, Dale A., Rice, G., National Museum of Natural Sciences (Canada). Paleobiology Division., Herzberg Institute of Astrophysics., National Research Council of Canada.
Classifications
LC ClassificationsQE734 .K17 1982
The Physical Object
Pagination151 p. :
Number of Pages151
ID Numbers
Open LibraryOL3220665M
LC Control Number83130395

Proposals for an extraterrestrial cause of the end-Cretaceous mass extinction were rejected by all of attendees but Jan Smit and Walter Alvarez. These became close friends based on their shared support for extraterrestrial hypotheses, although Smit was still more sympathetic to the supernova hypothesis. 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. 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. Extraterrestrial Cause for Cretaceous-Tertiary Extinc Experimental results and theoretical interprel Luis W. Alvarez, Walter Alvarez, Frank Asaro, Helen V. In the million-year period for which abundant fossil remains are avail- able, there have been five great biologi- cal crises, during which many groups of organisms died out.

2 PROFESSIONAL AFFILIATIONS American Association of Stratigraphic Palynologists (AASP): President-Elect Association for Tropical Biology (ATB) [] Botanical Society of America, Paleobotany Section (BSA) Canadian Association of Palynologists (CAP): Pres. elec ; President ; Nominating Committee , ; I.F.P.S. Councillor ;. Cretaceous-Tertiary Mass Extinctions: Biotic and Environmental Changes is a fascinating new study that combines the most current research on mass extinction with the theoretical perspectives of the leaders in the field. In twenty engaging essays, more than thirty leading paleobiologists and paleontologists uncover a wealth of data from the. Cretaceous-Tertiary extinctions and possible terrestrial and extraterrestrial causes. Syllogeus, 39, IS I pp An extraterrestrial event at the Cretaceous-Tertiary boundary Jan Questions to Ponder and Discuss. Why do so many people find dinosaurs so fascinating? McLauren () proposed a meteor impact as cause of a mass extinction in the Paleozoic.

The Cretaceous-Tertiary extinctions are one of the major extinction events in the history of life Unlike the Permian-Triassic extinctions, the Cretaceous-Tertiary extinctions appear to be sudden. An asteroid impact at the time appears to have played a major role in the extinction. The Cretaceous-Tertiary Extinction I: Definitions and Dramatis Personae. One of the most interesting aspects of dinosaur history is the extinction of the (nonavian) dinosaurs and the shift from the 4th to the 5th Amniote Radiation. Is the cause terrestrial (from Earth) or cosmic (from space)? Tempting to say one or both would have causes the extinctions. Might be that the catastrophes destabilized the climate and the ocean food chain long term. Thus, life could not recover quickly from the first big shock, resulting in a mass extinction.

K-TEC II, Cretaceous-Tertiary extinctions and possible terrestrial and extraterrestrial causes by K-TEC Group. Download PDF EPUB FB2

This was the fifth mass extinction event, called the Cretaceous-Tertiary Mass Extinction, or K-T Extinction for short. Although the Permian Mass Extinction, also known as the "Great Dying," was much larger in the number of species that went extinct, the K-T Extinction is the one most people remember because of public fascination with dinosaurs.

Cretaceous-Tertiary extinctions and possible terrestrial and extraterrestrial causes book this from a library. K-TEC II, Cretaceous-Tertiary extinctions and possible terrestrial and extraterrestrial causes: proceedings of the workshop held in Ottawa, CanadaMay [Dale A Russell; G Rice; K-TEC Group.; National Museum of Natural Sciences (Canada).

Paleobiology Division.; Herzberg Institute of Astrophysics.; National Research Council of Canada.]. 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 K–T extinction was characterized by the. 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.].

K-TEC II, Cretaceous-Tertiary extinctions and possible terrestrial and extraterrestrial causes: proceedings of the workshop held in Ottawa, CanadaMay Kyōryū wa naze zetsumetsushitanoka.

The plate tectonics theory for the cause of the K-T extinction hinges on the fact that sudden drops in the temperature of the atmosphere, a major cooling shock, and also of sea levels has been observed towards the end of the Cretaceous.

Syllogeus No. jfe, Cretaceous-Tertiary Extinctions and Possible Terrestrial and Extraterrestrial Causes. Nat. Mus. of Natural Sciences.

Alvarez et al. K-TEC Group (b). 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.

Russell, D. & Rice, G. (eds) K-TEC II: Cretaceous–Tertiary Extinctions and Possible Terrestrial and Extraterrestrial Causes (Syllogeous Ser.

39, National. 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. (Alvarez, L., et al.,Extraterrestrial Cause for the Cretaceous-Tertiary Extinction, Sciencep ) Since this discovery, iridium-rich clay layers have been found at the K/T boundary in rocks all K-TEC II the world, making the hypothesis for a planet-wide ecological catastrophe caused by an asteroid or comet impact much stronger.

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 Cretaceous.

/ 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 - $ The Cretaceous–Paleogene (K–Pg) extinction event, also known as the Cretaceous–Tertiary (K–T) extinction, was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago.

With the exception of some ectothermic species such as the sea turtles and crocodilians, no tetrapods weighing more than 25 kilograms (55 pounds) survived. 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 Scholar.

The faunal mass extinction at the end of the Cretaceous remained a puzzle until the late s when the extraterrestrial impact was proposed as the cause of the extinction. Sedimentary and geochemical evidence strongly suggests that a Strangelove ocean existed as.

K-TEC II, Cretaceous-Tertiary extinctions and possible terrestrial and extraterrestrial causes: proceedings of the workshop held in Ottawa, CanadaMay / by the K-TEC Group ; edited by D.A.

Russell and G. Rice. Alvarez, L.W., Alvarez, W., Asaro, F., and Michel, H.V., Extraterrestrial cause for the Cretaceous-Tertiary extinction. Science,– Google Scholar. Title: Extraterrestrial Cause for the Cretaceous-Tertiary Extinction Created Date: Z.

Cretaceous Period - Cretaceous Period - Terrestrial life: Although the fossil record is irregular in quality and quantity for the Early Cretaceous, it is obvious that dinosaurs continued their lengthy dominance of the land.

The Late Cretaceous record is much more complete, particularly in the case of North America and Asia. It is known, for instance, that during the Late Cretaceous many.

The following is an account that occurred on 19 May at K–TEC II (Cretaceous-Tertiary Environmental Change II) meeting in Ottawa, Canada. G.,K-TEC II: Cretaceous-Tertiary Extinctions and Possible Terrestrial and Extraterrestrial Causes: Syllogeus Ser National Museums of Canada (Proceedings, May workshop), pp.

The Cretaceous–Tertiary extinction event, now called the Cretaceous–Palaeogene extinction event, was about million years ago.

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. It was a large-scale mass extinction of animal and plant species.

The event marks the end of the. K-TEC Group,Cretaceous-Tertiary Extinctions and Possible Terrestrial and Extraterrestrial Causes: Syllogeus Ser National Museums of Canada (Proceedings of workshop held in Ottawa, Canada, November). Monastersky, R., K-T mass extinction – Abrupt or what?: Science News, Vol.Issue18, pg.

BibTeX @ARTICLE{Alvarez80extraterrestrialcause, author = {Luis W. Alvarez and Walter Alvarez and Frank Asaro and Helen V. Michel and Luis W. Alvarez and Walter Alvarez and Frank Asaro and Helen V. Michel}, title = {Extraterrestrial Cause for the Cretaceous-Tertiary Extinction}, journal = {Science}, year = {}, volume = {}, pages = {}}.

Analysis of molluscan collections from a 3+ m.y. interval around the Cretaceous–Tertiary (K–T) interval in east Texas suggests that molluscs suffered an extinction at or near the K–T boundary, followed by a prolonged period of stress which lasted through the P0 and P1a planktic foraminiferal zones.

The extinction of dominant clades has had positive as well as negative consequences – extinction removes incumbents and opens the way for other clades to radiate. For example, without the extinction of the incumbent dinosaurs and other ‘ruling reptiles’ 65 Ma ago, birds and mammals, including humans, would surely not be the dominant.

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. A quantitative scale for measuring greatness, G, of mass extinctions is proposed on the basis of rate of biodiversity diminution expressed as the product of the loss of biodiversity, called magnitude (M), and the inverse of time in which that loss occurs, designated as intensity (I).

On this scale, the catastrophic Cretaceous–Tertiary (K-T) extinction appears as the greatest since the. Of all mass extinction events that have ever occurred on Earth, the Great Dying was THE MOST DEVASTATING one but, the Cretaceous-Tertiary extinction event is THE MOST FAMOUS extinction event.

Why. Because this extinction event that happened 66 million years ago, ended once and for all, the rule of the dinosaurs on planet Earth and cleared the way for human evolution. 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. A quantitative scale for measuring greatness, G, of mass extinctions is proposed on the basis of rate of biodiversity diminution expressed as the product of the loss of biodiversity, called magnitude (M), and the inverse of time in which that loss occurs, designated as intensity (I).On this scale, the catastrophic Cretaceous–Tertiary (K-T) extinction appears as the greatest since the.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.Extraterrestrial cause for the Cretaceous-Tertiary extinctions: Experiment and theory, Science– Beckmann, J.P.

(). Distribution of benthonic foraminifera at the Cretaceous-Tertiary boundary of Trinidad (West Indies), Report 21st Geol. Congr., Norden, part V, 57–