Pacific Science Volume 26, Number 2, 1972

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Pacific Science is a quarterly publication devoted to the biological and physical sciences of the Pacific Region.

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    Geology of the Salt Lake Area, Oahu, Hawaii
    (University of Hawai'i Press, 1972-04) Pankiwskyj, Kost A.
    ABSTRACT: A series of pyroclastic eruptions and one lava flow, all of melilitenephelinite composition, were produced in the environs of present-day Salt Lake, Oahu, Hawaii, beginning about 500,000 years ago and terminating more than 100,000 years ago. The age of the flow has been dated by a K40/ A40 method at 400,000 years to 470,000 years. The earliest eruptions took place at a time of higher sea levels than at present, and their products are water-laid. Later eruptions, including the major ones from Salt Lake Crater and Makalapa Crater, took place at a time of lower sea levels than at present, and their products are air-laid. Sufficient time elapsed between individual eruptions to allow for erosion of portions of the earlier cones, to deposit silt and gravel, or to develop a soil prior to a subsequent eruption. The pyroclastics are medium- to fine-grained, lithic-vitric tuffs and contain, in addition to juvenile material, a considerable quantity of particles of older rocks-volcanic and sedimentary, as well as ultramafic. The youngest deposits of tuff are unconformably truncated by reef and limestone which have been correlated with rocks dated by a Th23o/UZ38 method at 90,000 to 140,000 years.
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    Giant Submarine Landslides on the Hawaiian Ridge: A Rebuttal
    (University of Hawai'i Press, 1972-04) Langford, Stephen A. ; Brill, Richard C.
    ABSTRACT: A highly precise bathymetric record shows the U.S. Navy Oceanographic Office (NAVOCEANO) chart upon which Moore's landslide hypothesis was based to be inaccurate. We find no evidence for landsliding. Three possible in situ origins for the seamounts in question are offered as alternatives.
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    Genetic Events in Rat Populations at Eniwetok Atoll
    (University of Hawai'i Press, 1972-04) Tamarin, Robert H. ; Malecha, Spencer R. ; Steiner, William W. ; Dennis, Michael N.
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    Eutardigrada: Distribution at Eniwetok Atoll, Marshall Islands
    (University of Hawai'i Press, 1972-04) Mehlen, Ronal H.
    ABSTRACT: Six species of Eutardigrada were found at Eniwetok Atoll, representing two families (Macrobiotidae and Milnesiidae) and three genera (Hypsibius, Macrobiotus, and Milnesium). Hypsibius (Calohypsibius) truncatus was found in sand samples from the thalassosupralittoral fringe at Runit and Eniwetok islets. H. (Isohypsibius) augusti was found in sand of the thalassosupralittoral fringe on Engebi Islet. Macrobiottts allani was found on Muti Islet; M. harmsUlorthi on Bogallua, Engebi, Roijoa, Eniwetok, Muti, and Igurin islets; M. richtersi on Japtan and Muti islets; all three species from tree-borne lichens and mosses. Milnesium tardigradum was commonly recovered from lichens and mosses on Muti and Igurin islets. The total number of individuals collected was small compared to collections in the temperate zone. No morphological anomalies were noted.
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