Jökull


Jökull - 01.12.1987, Side 62

Jökull - 01.12.1987, Side 62
in greater details. Bedding type, thickness, contacts, sedimentary structures, texture, deformational fea- tures, fossiis, and vertical and lateral facies relations, were used to define and interpret the stratigraphic units. Subfossil molluscs were sampled for dating purposes and used as an aid in the environmental interpretations. The textural analysis of the sediments was done in the field, with a laboratory check of selected samples. The grain-size scale used is the Udden-Wentworth graded scale (Blatt, Middleton and Murray 1972, p. 46). The term “gravel", if not specified, includes granules, peb- bles and cobbles. For documentation and interpretation of the sedimentological data a modified version of the lithologic code of Miall (1977) and Eyles et al. (1983) was used (Table I). I omit the interpretative parenthized last letter of the Eyles et al. (1983) code, except when de- scribing regionally extensive lag concentration deposits (G(l)). Chronostratigraphical terminology used is in accordance with Mangerud and Berglund (1978). STRATIGRAPHY AND FACIES RELATION SHIPS A profile section of the Melabakkar-Ásbakkar cliffs is shown as Fig. 2. The base of the profile is the high tidal stand. The lower contact of the sequence where observ- ed is striated bedrock, bearing witness to a glacial epi- sode when the glaciers extended beyond the present coast, prior to the glacial events registered in the strata. The age of this oldest glacial episode is not known. All Contacts: Erosional Sharp, contormable Graded Loaded Composite Litho- vertical Stratigraphic facies section unit Facies/ Facies association Log Sp, Ss.Gs, G(1). B(l> Melagil gravels and Yíi ftTM sands Emergence All Ss Ss-FI Fl Fu . y. y 4 Melabakkar silts and . • ~J sands Sublittoral B C E Glaciomarine Gu.Gp.Ggn, Gs, Ss, St.Sp Dmu, Dcu, Sp.Ss.Su, Gu.Dms y/ FI-SI Dms Sp.St.Ss, Gu.Ggn Ásgil gravels lce-marginal outwash E Á A A J Melar diamicton Lodgement till ACD Y/y//(/1 Landhólmi sands lce-marginal delta D ~z= * ^4 Látrar beds Glaciomarine C F D Esker fan Gu.Ggn, Ggr, Gp.Ss.Su, S|, FI.Dmu, Dms Dms, Dmu, Gu.Gs, Ggn, Ss.SI ^V A Ás beds Morainal bank F G ■ • (1 Ásbakkar diamicton (5 A Glaciomarine A B C E G H -111 1 1 1 II Striated bedrock m F S G Fig. 3. Lithologiclogsfromthecliffs. ForlocationsandcorrelationsseeFig. 2. Lithologiccode inTable I. Inserted figure: A composite vertical section (not to scale) showing lithofacies, stratigraphy and facies interpretations. 3. mynd. Jarðlagasnið frá bökkunum. Staðsetning sniða Í2. mynd. Setlykill í töflu I. Innskotsmynd: samsett snið. 60
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