Journal ArticleDOI
Radiolaria: Change in Skeletal Weight and Resistance to Solution
TLDR
In the Cenozoic era, Radiolaria living in tropical waters developed progressively lighter skeletons, apparently as a result of an evolutionary trend as mentioned in this paper, and the average skeletal weight of Quaternary Radiology is only one-fourth that of Eocene Radiology.Abstract:
During the Cenozoic Era, Radiolaria living in tropical waters developed progressively lighter skeletons, apparently as a result of an evolutionary trend. The average skeletal weight of Quaternary Radiolaria is only one-fourth that of Eocene Radiolaria. If the rate of production of these organisms has remained constant, the amount of silica delivered to the ocean floor per unit time by Eocene Radiolaria is four times greater than that being deposited by Quaternary Radiolaria. Species from the various Cenozoic faunas differ in their resistance to solution. Thus, in assemblages from sediment samples, the presence, absence, and abundance of certain species provide a key to the amount of mixing of faunas and the degree of corrosion of assemblages.read more
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Journal ArticleDOI
The chemistry, biology, and vertical flux of particulate matter from the upper 400 m of the equatorial Atlantic Ocean
TL;DR: In this article, the authors used light and scanning electron microscopy to determine the size and morphological distributions of the particles in a profile from the upper 400m at 2°47'N, 8°51'W in the equatorial Atlantic by large volume in situ filtration.
Journal ArticleDOI
Diagenesis of siliceous oozes—I. Chemical controls on the rate of opal-A to opal-CT transformation—an experimental study
TL;DR: In this article, a solution-redeposition mechanism is employed in the opal-A-to-opal-CT transformation in deep-sea sediments, showing that the transformation rate is much higher in carbonate-rich sediments than in clay-rich ones.
Book ChapterDOI
Cretaceous and Cenozoic Sediments from the Atlantic Ocean
Wolfgang H Berger,U. von Rad +1 more
TL;DR: In this paper, the Deep Sea Drilling Project completed 9 holes; 7 were located off NW Africa, 1 in Ceara Abyssal Plain, and 1 on Demerara Rise.
Journal ArticleDOI
Pacific Ocean and Cenozoic evolution of climate
Mitchell W Lyle,John A. Barron,Timothy J. Bralower,Matthew Huber,Annette Olivarez Lyle,A. Christina Ravelo,David K. Rea,Paul A. Wilson +7 more
TL;DR: The Pacific Ocean has played a major role in climate evolution throughout the Cenozoic (65-0 Ma) as discussed by the authors, and is a fundamental component of global heat transport and circulation, the dominant locus of primary productivity, and the largest reservoir for carbon exchange between the oceans and the atmosphere.
Journal ArticleDOI
Radiolarian palaeoecology and radiolarites: is the present the key to the past?
Grzegorz Racki,Fabrice Cordey +1 more
TL;DR: In this paper, the authors proposed a uniformitarian approach based on a silica-starved vigorous ocean, which is of limited significance when applied to the pre-Neogene settings, especially in the peculiar planktic habitats of epeiric seas.