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Belemnite battlefields

1 January, 1993

Mass accumulations of belemnite rostra (‘belemnite battlefields’) are common in Mesozoic sediments, and accumulations of belemnoids are also known from older rocks. Many Recent teuthid species suffer mortality immediately after…

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Observations on life cycle and feeding ecology of two recently introduced predatory beetle species at South Georgia, sub-Antarctic

1 January, 1993

On South Georgia, two recently introduced species of predatory beetle,Oopterus soledadinus andTrechisibus antarcticus (Coleoptera, Carabidae), were studied in the period November 1991–April 1992. The study area comprised the coastal area…

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Trace-element and isotopic characteristics of small-degree melts of the asthenosphere: Evidence from the alkalic basalts of the Antarctic Peninsula

1 January, 1993

Miocene-Recent continental alkalic basalts were erupted along the Antarctic Peninsula as a result of decompressional melting of the asthenosphere caused by the formation of slab-windows beneath the continental margin following…

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Ionospheric convection response to slow, strong variations in a northward interplanetary magnetic field: A case study for January 14, 1988

1 January, 1993

We analyze ionospheric convection patterns over the polar regions during the passage of an interplanetary magnetic cloud on January 14, 1988, when the interplanetary magnetic field (IMF) rotated slowly in…

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Interpretation of acoustic data at two frequencies to discriminate between Antarctic krill (Euphausia superba Dana) and other scatterers

1 January, 1993 by Eugene Murphy

A visual classification was carried out of echo trace characteristics derived from 113 integration intervals of 1 n mi (nautical mile) each taken from the Southern Ocean in the area…

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Differences in backscattering strength determined at 120 and 38 kHz for three species of Antarctic macroplankton

1 January, 1993 by Peter Ward

The ability to acoustically separate zooplankton species is an important requirement for ecological studies and to improve biomass estimates. In order to distinguish between Euphausia superba and other swarm-forming macroplankters…

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Growth in the bivalve Yoldia eightsi at Signy Island, Antarctica, determined from internal shell increments and calcium-45 incorporation

1 January, 1993 by Andrew Clarke

The growth rate of the infaunal nuculanid bivalve Yoldia eightsi at Factory Cove, Signy Island, South Orkney Islands (maritime Antarctica), was estimated from internal shell increments and 45Ca incorporation of…

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Late Miocene valley-confined subglacial volcanism in northern Alexander Island, Antarctic Peninsula

1 January, 1993

Isolated, Late Miocene volcanogenic sequences in northern Alexander Island, Antarctic Peninsula, form an unusual, cogenetic association of volcaniclastic, sandy-gravelly lithofacies (including tillites) and volcanic (lava/hyalocalstite) lithofacies. Using simple lithofacies analysis…

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