Jökull


Jökull - 01.12.1989, Page 74

Jökull - 01.12.1989, Page 74
process can be speeded up considerably by employ- ing computerized two-dimensional image analysis. REFERENCES Blatt, H., G. Middleton and R. Murray. 1972. Origin of Sedimentary Rocks. New Jersey, Prentice-Hall, 634 pp. Clarke, G.M. and D. Cooke. 1983. A Basic Course in Statistics. London, Edward Amold, 421 pp. Dobkins, J.E. and R.L. Folk. 1968. Pebble Shape Development on Tahiti-Nui. Journal of Sedimen- tary Petrology 40, 1167-1203. Egilson, D. 1974. Athuganir á gjallfalli í Heima- eyjargosi 1973 (in Icelandic). Reykjavík, Univer- sity of Iceland, BS thesis, 45 pp. Einarsson, E. H., G. Larsen and S. Thorarinsson. 1980. The Sólheimar tephra layer and the Katla eruption of = 1357. Acta Naturalia Islandica 28, 24 pp. Einarsson, Th. 1965. Det submarine utbrudd ved Vestmannaeyjar, Syd-Island (in Norwegian). Naturen 2, 67-85. Fisher, R.V. and H.-U. Schmincke. 1984. Pyroclastic Rocks. Berlin, Springer-Verlag, 472 pp. Folk, R.L. 1955. Student Operator Error in Determi- nation of Roundness, Sphericity, and Grain Size. Journal of Sedimentary Petrology 25, 297-301. — 1974. Petrology of Sedimentary Rocks. Texas, Hemphill Publishing Co., 182 pp. Heiken, G. 1972. Morphology and petrography of volcanic ashes. Geological Society of America Bulletin 83, 1961-1988. Heiken, G. and K. Wohletz. 1985. Volcanic Ash. Berkeley, University of California Press, 246 pp. Jóhannesson, H., R.M. Flores and J. Jónsson. 1981. A short account of the Holocene tephrochronol- ogy of the Snaefellsnes central volcano, Westem Iceland. Jökull 31, 23-30. Jónsson, J. 1978. Jarðfrœðikort af Reykjanesskaga /-// (in Icelandic). Reykjavík, Orkustofnun OS- JHD 7841, 303 pp. Krumbein, W. C. 1934. Size frequency distributions of sediments. Journal of Sedimentary Petrology 4, 65-77. Larsen, G. and S. Thorarinsson. 1978. H4 and other acid Hekla tephra layers. Jökull 27, 28-46. McManus, D.A. 1963. A criticism of certain usage of the phi notation. Journal of Sedimentary Petrology 33, 670-674. Norðdahl, H. 1983. Late Quaternary Stratigraphy of Fnjóskadalur central North Iceland. Lund, Lund University, Department of Quaternary Geology, Thesis 12, 78 pp. Olafsson, G. 1985. Flokkun heimilda um íslensk gjóskulög og gjóskulagarannsóknir (in Ice- landic). Reykjavík, University of Iceland, BS Honours thesis, 77 pp. Olafsson, M., P. Imsland, and Gudrún Larsen. 1984. Nomahár II. Efni, eiginleikar og myndun (in Ice- landic). Náttúrufrœðingurinn 53, 135-144. Parks, J.M. 1966. Cluster analysis applied to mul- tivariate geologic problems. Journal of Geology 74,703-715. Self, S„ R.S.J. Sparks, B. Booth and G.P.L. Walker. 1974. The 1973 Heimaey Strombolian scoria deposit, Iceland. Geological Magazine 111, 539- 548. Self, S. and R.S.J. Sparks. 1978. Characteristics of wide-spread pyroclastic deposits formed by the interaction of silicic water and magma. Bulletin Volcanologique 41, 196-212. Sigurdsson, H. 1982. Utbreiðsla íslenskra gjósku- laga á botni Atlantshafs (in Icelandic). In: Thórar- insdóttir, H„ O.H. Oskarsson, S. Steinþórsson and Th. Einarsson (ed.) Eldur er í norðri. Reykjavík, Sögufélag, 119-127. Sigurdsson, H. and R.S.J. Sparks. 1978. Rifting episodes in north Iceland in 1874-75 and the eruption of Askja and Sveinagjá. Bulletin Vol- canologique 41, 1-19. Sigvaldason, G.E. 1974. The petrology of Hekla and origin of silicic rocks in Iceland. 'I'he Eruption of Hekla 1947-1948. V. 1. Soc. Sci. Isl. 44 pp. — 1979. Rifting, magmatic activity and interaction between acid and basic liquids. The 1875 Askja eruption in Iceland. Reykjavík, Nordic Volcanol. Inst. Rep. 7903, 54 pp. Sneed, E. D. and R.L. Folk. 1958. Pebbles in the Lower Colorado River, Texas, a study in particle morphogenesis. Journal ofGeology 66, 114-150. 72 JÖKULL, No. 39, 1989
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