A marine geophysical study of the Andaman Sea has been conducted as part of the International Indian Ocean Expedition. A combination of magnetic, gravity, bathymetric, and sea‐floor heat‐flux measurements, seismic sparker reflection profiles, and bottom sediment samples has been used in a study of the seaward continuity of major subaerial tectonic trends. The data indicate positive continuity of the structural trend of the Barisan Range of northern Sumatra and the Burma Range. It was found that the central graben of the Barisan Range of northern Sumatra extends into the Andaman Sea north to latitude 10°N. A previously unreported interdeep has been observed between the outer sedimentary island arc and the inner igneous trend of the major primary arc which forms the western boundary of the Andaman Sea. Continental thickness of the crust is indicated under the sedimentary island platform. In the area of the backdeep, the north‐northeast trends of the Malaysian peninsula are prominent.
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ABSTRACT:Collections during July and August, 1962, near the Blue Ridge of southwestern North Carolina yielded 23,242 specimens of Drosophila, including 25 species, plus a single specimen of each of the related genera Amiota and Leucophenga. Variations in numbers and proportions of species and of sexes of the same species were noted from place to place and with time of day. Species of the D. affinis subgroup were generally much more common than other species, with D. affinis itself far more frequent than its close relatives D. algonquin, athabasca, and narragansett. Striking diurnal changes in sex ratio were noted in the D. affinis subgroup, generally in the direction of an excess of males late in the day; it is suggested that variation in intensity of illumination was probably responsible. The significance of the presence and proportions of a number of the species in conjunction with their known geographical distributions is discussed.
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