Journal ArticleDOI
Sudden extinction of the dinosaurs: latest Cretaceous, upper Great Plains, USA.
Peter M. Sheehan,David E. Fastovsky,Raymond G. Hoffmann,Claudia B. Berghaus,Diane L. Gabriel +4 more
TLDR
Results of a three-year field study of family-level patterns of ecological diversity of dinosaurs in the Hell Creek Formation show no evidence of a gradual decline of dinosaurs at the end of the Cretaceous, in agreement with an abrupt extinction event such as one caused by an asteroid impact.Abstract:
Results of a three-year field study of family-level patterns of ecological diversity of dinosaurs in the Hell Creek Formation of Montana and North Dakota show no evidence (probability Pread more
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Rare Earth: Why Complex Life is Uncommon in the Universe
TL;DR: The Astrobiology Revolution and the rare Earth Hypothesis Dead Zones of the Universe Rare Earth Factors 1 Why Life Might Be Widespread in the Universe 2 Habitable Zones and Building a Habitable Earth 4 Life's First Appearance on Earth 5 How to Build Animals 6 Snowball Earth 7 The Enigma of the Cambrian Explosion 8 Mass Extinctions and the Rare Earth Hypotheses 9 The Surprising Importance of Plate Tectonics 10 The Moon, Jupiter, and Life on Earth 11 Testing the rare earth hypotheses 12 Assessing the Odds 13 Messengers from the
Journal ArticleDOI
Origination, Extinction, and Mass Depletions of Marine Diversity
TL;DR: In this paper, the extinction intensities for all Phanerozoic substages show a continuous distribution, with the five traditionally recognized mass extinctions located in the upper tail.
Journal ArticleDOI
The Quality of the Fossil Record: Populations, Species, and Communities
Susan M. Kidwell,Karl W. Flessa +1 more
TL;DR: Molluscs are the most durable of modern aquatic groups studied so far, and they show highest fidelity to the original community.
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Abrupt and Gradual Extinction Among Late Permian Land Vertebrates in the Karoo Basin, South Africa
Peter D. Ward,Jennifer Botha,Roger Buick,Michiel O. De Kock,Douglas H. Erwin,Geoffrey H. Garrison,Joseph L. Kirschvink,Roger M. H. Smith +7 more
TL;DR: The vertebrate fossil data show a gradual extinction in the Upper Permian punctuated by an enhanced extinction pulse at the Permians-Triassic boundary interval, particularly among the dicynodont therapsids, coinciding with negative carbon-isotope anomalies.
Journal ArticleDOI
Impact of the terminal Cretaceous event on plant–insect associations
TL;DR: Evidence for a major extinction of insect herbivores is provided by presence–absence data for 51 plant–insect associations on 13,441 fossil plant specimens spanning the Cretaceous/Paleogene boundary in southwestern North Dakota.
References
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Journal ArticleDOI
Extraterrestrial Cause for the Cretaceous-Tertiary Extinction
TL;DR: A hypothesis is suggested which accounts for the extinctions and the iridium observations, and the chemical composition of the boundary clay, which is thought to come from the stratospheric dust, is markedly different from that of clay mixed with the Cretaceous and Tertiary limestones, which are chemically similar to each other.
Journal ArticleDOI
Marine Benthic Diversity: A Comparative Study
TL;DR: A within-habitat analysis was made of the bivalve and polychaete components of soft-bottom marine faunas which differed in latitude, depth, temperature, and salinity, and it was indicated that species number is the more valid diversity measurement.
Related Papers (5)
Extraterrestrial Cause for the Cretaceous-Tertiary Extinction
Gradual Dinosaur Extinction and Simultaneous Ungulate Radiation in the Hell Creek Formation
Sampling bias, gradual extinction patterns and catastrophes in the fossil record
Philip W. Signor,Jere H. Lipps +1 more