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Archival description
W.O. Kupsch fonds
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Age of Atlantic islands

Age of Atlantic islands, as indicated by the oldest rocks found on them apparently tends to ncrease with increasing distance from the Mid-Atlantic Ridge. The numbers associated with the islands give these ages in millions of years. Geologists divide Iceland into three areas of different ages, the central one being the youngest. Islands that have active volcanoes are represented by black triangles: most of these lie on or near the Mid-Atlanric Ridge (J.T. Wilson, 1963, Sci. Amer.)

Almost complete view of Gullfoss section

Almost complete view of Gullfoss section to show from bottom to top: basalt (Bill Matthews and Maxwell Gage standing on this), tillite, lower varved lacustrine sediments, lower crossbedded deltaic sandstone, lower ice contact stratified sand and gravel (footpath at the top of this unit, which shows ripple marks in places), upper varved lacustrine sediments (locally with disturbed strata, probably slump structures), upper crossbedded deltaic sandstone (some people standing on this), upper ice contact stratified sand and gravel (exposed to the left on higher level than where people are standing). Not shown: basalt overlying upper stratified drift. The rocks of the Gullfoss series show normal magnetic polarity but it is not shown whether they belong to the Old Grey Basalts (Pliocene-Pleistocene) or the Young Grey Basalts (Pleistocene). August 9, 1960.

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