Cosmochemistry provides critical insights into the workings of our local star and its companions throughout the galaxy, the origin and timing of our solar system’s birth, and the complex reactions inside planetesimals and planets (including our own) as they evolve. Much of the database of cosmochemistry comes from laboratory analyses of elements and isotopes in our modest collections of extraterrestrial samples. A growing part of the cosmochemistry database is gleaned from remote sensing and in situ measurements by spacecraft instruments, which provide chemical analyses and geologic context for other planets, their moons, asteroids, and comets. Because the samples analyzed by cosmochemists are typically so small  and valuable, or must be analyzed on bodies many millions of miles distant, this discipline leads in the development of new analytical technologies for use in the laboratory or flown on spacecraft missions. These technologies then spread to geochemistry and other fields where precise analyses of small samples are important <...>

Nous nous interesserons dans ce cours au calcul des sismogrammes synthetiques dans des milieux complexes au moyen des methodes asymptotiques. Je parlerai essentiellement de la theorie des rais.
Depuis une vingtaine d'annees, les sismogrammes synthetiques ont ete utilises de facon routiniere pour inter preter les donnees sismiques et sismologiques. <...>

15 outcrops exposing sediments of Early and Late Cretaceous age (Berriasian-Campanian) are described from the Subhercynian Basin (Quedlinburg-Blankenburg area) and the eastern part of Lower Saxony (Salzgitter-Hannover area). Apart from the bio- and lithostratigraphy, the fauna, flora, sedimentology, the palaeoenvironment and the regional position of these outcrops is discussed. New data and results going back to research performed from 1990 to 1996 are presented and sequence-stratigraphic models are proposed for some outcrops. Some of the microfauna and -flora and the macrofauna is documented by plates.

The following outcrops exposing sediments of Early Cretaceous age are described: the Obernkirchen Sandstone (Berriasian) at Munchehagen (No. 15), mid-Hauterivian sediments rich in ammonites near Resse (No. 13), pale-dark bedding rhythms of Late Hauterivian age near Frielingen (No. 14), Hauterivian iron ores of the Glockenberg section (No. 5) and clays of Barremian and Aptian age near Sarstedt (No. 9). Outcrops of sediments of Late Cretaceous age are: Hoppenstedt (No. 3), Vienenburg (No. 4), Baddeckenstedt (No. 6), and the HPCF II quarry at Misburg (No. 10), exposing the Cenomanian and Lower Turonian; the sediments exposed in the Salzgitter-Salder quarry (No. 7) are of mid-Turonian to Early Coniacian age, the Lehofsberg section near Quedlinburg (No. 1) is of mid-Coniacian age; shallow marine elastics of early Campanian age of the Subhercynian Basin are described from near Blankenburg (No. 2), marly and calcareous Campanian basinal sediments are exposed in the HPCF II (No. 10), Germania IV (No. 11) and Teutonia I (No. 12) quarries at Misburg.

The James Ross Basin, at the northern tip of the Antarctic Peninsula, provides the thickest and best-exposed onshore Cretaceous and Early Tertiary sedimentary succession in Antarctica. When compared with other onshore sections, it is clear that the area has a much broader significance as a key reference section for the Cretaceous and Early Tertiary throughout the Southern Hemisphere. The sedimentary record
exposed within the basin also provides an unrivalled opportunity to unlock the record of climate change and biotic response within a high-palaeolatitude setting.

James Ross Island was first visited during the heroic age of polar exploration at the start of the 20th century. Swedish geologist Otto Nordenskj61d sailed into the region in 1901 in his ship Antarctic, captained by explorer and sealer Carl Larsen. Plans to spend a year in the region for scientific exploration went disastrously wrong when his ship sank near Paulet Island, forcing Nordenskj61d to spend over 2 years in a small hut on Snow Hill Island. Members of his ship-wrecked party survived in horrific conditions, with only penguins for food and small stone huts for shelter at Hope Bay, at the tip of Trinity Peninsula, and also on Paulet Island.<...>