منابع مشابه
Modeling atmospheric O2 over Phanerozoic time
A carbon and sulfur isotope mass balance model has been constructed for calculating the variation of atmospheric O2 over Phanerozoic time. In order to obtain realistic O2 levels, rapid sediment recycling and O2-dependent isotope fractionation have been employed by the modelling. The dependence of isotope fractionation on O2 is based, for carbon, on the results of laboratory photosynthesis exper...
متن کاملThe Red Queen revisited: reevaluating the age selectivity of Phanerozoic marine genus extinctions
—Extinction risk is inversely related to genus age (time since first appearance) in most intervals of the Phanerozoic marine fossil record, in apparent contradiction to the macroevolutionary Red Queen’s Hypothesis, which posits that extinction risk is independent of taxon age. Agedependent increases in the mean species richness and geographic range of genera have been invoked to reconcile this ...
متن کاملCalcareous tubeworms of the Phanerozoic
Morphological similarities indicate that Palaeozoic problematic tubeworms, e.g. tentaculitids, cornulitids, microconchids, trypanoporids, Anticalyptraea, and Tymbochoos, form a monophyletic group. This group may also include hederelloids. Members of this group share affinities with lophophorates and their evolution could have partly been driven by predation. The extinction of Palaeozoic tubewor...
متن کاملLithospheric scale gravitational flow: the impact of body forces on orogenic processes from Archaean to Phanerozoic
In the Archaean, the combination of warmer continental geotherm with a lighter sub-continental lithospheric mantle suggests that gravitational forces played a more significant role in continental lithospheric deformation. To test this hypothesis, we compare the evolution of the deformation and the regional state of stress in ‘Archaean-like’ and ‘Phanerozoic-like’ lithospheres submitted to the s...
متن کاملThe Anatomy of Large Scale Systems Revisited
In papers at the prior ESD Symposia we discussed system properties, often called ilities, as well as the structure of large scale systems. Issues related to ilities have been relatively well understood, but issues related to structure and organization were not. Hence this paper addresses this issue again. The main architectural concept in the earlier papers was layered hierarchies. We will disc...
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ژورنال
عنوان ژورنال: Episodes
سال: 1982
ISSN: 0705-3797,2586-1298
DOI: 10.18814/epiiugs/1982/v5i3/001