Palaeobotanical evidence for a warm Cretaceous Arctic Ocean
Article Abstract:
The Cretaceous period in the Arctic Ocean marked a time of global warming. There exists some controversy over the equator-to-pole temperature changes. Fossil evidence show that temperatures near the polar area were higher compared to the present. Minimal knowledge about oceanic poleward heat transport makes it difficult to model the Cretaceous climate. It is found that the Arctic Ocean was relatively warm, with temperatures above 0 degrees centigrade during winter. This signifies poleward heat transport.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
User Contributions:
Comment about this article or add new information about this topic:
Evidence for a K/T impact event in the Pacific Ocean
Article Abstract:
Spinel-bearing particles found at the Cretaceous/Tertiary boundary at site 577 in the Pacific Ocean appear to result from the impact of a meteor of two km diameter within the Pacific, not from Mexico's Chicxulub crater. Composition and structure of some of the fragments are not consistent with the latter impact site, nor with its distance. This and other studies imply that there were several accretionary impacts at the end of the Cretaceous rather than a single huge one.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
User Contributions:
Comment about this article or add new information about this topic:
Geological record and reconstruction of the late Pliocene impact of the Eltanin asteroid in the Southern Ocean
Article Abstract:
Geological research shows that the Eltanin asteroid was between one and four kilometers in size and impacted the earth in the late Pliocene period. Marine-geological, bathymetric and seismic experiments indicate that the impact occurred approximately 2.5 million years ago. The impact, which occurred at a depth of between 2,500 meters and 5,000 meters in the Antarctic Ocean, had an explosive force of between ten(super 5) to ten(super 7) Mt TNT explosive.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Sea-level rise or fall? The elusive Arctic warming. The timing of Pleistocene glaciations from a simple multiple-state climate model
- Abstracts: A new family of monotremes from the Cretaceous of Australia. Ground rules for early birds
- Abstracts: Implications of an exceptional fossil flora for Late Cretaceous vegetation. Low-down on a land bridge
- Abstracts: Agrin signals at the junction. The Cdt1 protein is required to license DNA for replication in fission yeast. Fission yeast chk1 protein kinase links the rad checkpoint pathway to cdc2
- Abstracts: Male sexual rest affects litter sex ratio of newborn Norway rats. Can microhabitat selection or differences in 'catchability' explain male-biased sex ratios in overwintering populations of monarch butterflies?