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| Jones, Ejw; Siddall, R; Thirlwall, Mf; Chroston, Pn; Lloyd, Aj. |
| Seismic data from the flat-topped Anton Dohrn Seamount in the central Rockall Trough reveal that the feature is capped by a thin (approximately 100 m) sedimentary layer which covers an extensive erosion surface lying approximately 800 m below sea level. The surface of erosion truncates a volcanic sequence that outcrops on the eastern side of the seamount to form a well-defined terrace from which alkali basalts and chalks of late Cretaceous age have been recovered. A refraction profile shot over the summit plateau and ultrasonic measurements on the basalts suggest that sedimentary and volcanoclastic units are abundant constituents of a low-velocity (3.69 km s-1) volcanic core which persists to depths of over 1 500 m. The seamount differs from the shallow... |
| Tipo: Text |
Palavras-chave: ATLANTIC; BASALTS; GUYOT; RIFTING; ROCKALL. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00098/20887/18501.pdf |
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| Levy, A. |
| In the sedimentary areas surrounding the Florida Keys, Soritidae and Peneroplidae are very well represented. These benthic foraminifera are generally attached to seagrasses or algae and more rarely to carbonate deposits. The colouring of their protoplasm results from the nature of endosymbiotic algae. The principal species represented are: Androsina lucasi (never recorded before in Florida) which lives only in the margino-littoral biotopes where the salinity is highly variable; Archaias angulatus and Amphisorus hemprichii which live in the biotopes of the littoral platform but also in those of the interior margin of the bay where the variations of salinity are weak; Cyclorbiculina compressa and Peneroplis proteus which live for the main part in the... |
| Tipo: Text |
Palavras-chave: ATLANTIC; FLORIDA-KEYS; FORAMINIFERA; ECOLOGY. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00103/21379/18979.pdf |
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