Showing papers in "Earth-Science Reviews in 1973"

TL;DR: Aeolian dunes are formed by the efflorescence of salts or by the mechanical disintegration of mud curls as discussed by the authors, where the resultant clays, when blown to the vegetated margin, may be trapped and accumulate into a dune.

TL;DR: The drop in gross oceanic productivity at times of major extinction is associated with low diversity and decreased rate of accumulation of biogenic ooze, hence the apparent worldwide disconformities, as at the Cretaceous-Tertiary boundary, even in the deep sea.

TL;DR: Stromatolites are laminated biosedimentary structures usually attributed to the trapping and binding as well as chemical action of non-skeletal algae in shallow-water environments as discussed by the authors.

TL;DR: In this paper, it was suggested that a search for the source of these strewn fields be made using satellite photographs to look for wide shallow craters produced by super-Tunguska type events on areas of Mesozoic sandstones.

TL;DR: In this article, the authors divide ultramafic rocks into five principal geotectonic groups, as follows: (1) Layered gabbro-norite-peridotite masses, commonly associated with all ages of terrane, possibly connected with accretionary plate margins.

TL;DR: In the last decade, major advances in both observational and theoretical fields have taken place in our understanding of the rotation of the Earth as discussed by the authors, made possible by the study of periodicities in the skeletal growth of fossil organisms.

TL;DR: A survey of the recent advances in the application of surface waves, free oscillations and static dislocations for the determination of focal mechanisms is given in this article, where a brief outline of the major results of the interpretation of the focal mechanism solution of earthquakes in terms of regional stress distributions and the geodynamic processes that are currently taking place is also included.

TL;DR: In this paper, the authors review the state of the art in the subdisciplines of geology and attempt to mention all the main aspects of geological data file building and interchange.

TL;DR: A brief introduction to the various approaches which have been followed in attempting to construct models of the origin of the solar system is given in this article, where the author outlines in more detail one of the more recent approaches, involving models of a massive primitive solar nebula.

TL;DR: In this article, the state of the art for several of the most promising or widely applied techniques, including 18 O/ 16 O paleotemperatures, biological methods such as paleobiogeography, distribution of certain sediment types and paleomagnetism, are evaluated.