Evidence for the occurrence of Vedde Ash in Sweden: radiocarbon and calendar age estimates

A Late Younger Dryas–Early Holocene tephrostratigraphy for Fosen, Central Norway

“…The major element composition of the lowermost layer is consistent with previously published rhyolitic data for the VA in Sweden (Fig. 3C,D) (Wastega ˚rd et al, 1998). At other Norwegian sites the bimodal composition of the VA, consisting of both rhyolitic and/or intermediate to basaltic glass, has been identified (Mangerud et al, 1984;Birks et al, 1996), whereas more distal sites are dominated by the rhyolitic fraction (Wastega ˚rd et al, 2000b;Lane et al, 2012b).…”

A new early Holocene cryptotephra from northwest Scotland

“…yr BP for the prominent pollen concentration minimum in the sample at Figure 3 Chemical characteristics of tephras. Two biplots showing the clear separation of the three tephra layers at Lochan An Druim by their major element oxides, also shown are the envelopes for the Vedde Ash Wastegård et al, 1998;Bjö rck and Wastegård, 1999;Wastegård et al, 2000b) and Borrobol Tephra : (a) plot of potassium oxide and iron oxide; (b) plot of magnesium oxide and calcium oxide. Two ternary diagrams showing the relative proportions of the oxides of potassium, calcium and iron in the three tephra layers at Lochan An Druim and various other tephras: (c) S21 and S30 tephras from Lochan An Druim, Vedde Ash Wastegård et al, 1998;Bjö rck and Wastegård, 1999;Wastegård et al, 2000b) and Borrobol Tephra (data for the latter two from Tephrabase: http://www.geo.ed.ac.uk:81/ tephra/).…”

Plio-Pleistocene microtephra in DSDP site 231, Gulf of Aden

“…Elsewhere, microscopic examination of sediments has extended regional stratigraphic correlations by detecting tephra in horizons not visible to the naked eye, notably in peat deposits in northern Britain (e.g., Turney et al, 1997) and Scandinavia (e.g., Wastegard et al, 1998). These tephra deposits have interchangeably been termed microtephra (e.g., Turney et al, 1997;Wastegard et al, 2000;Davies et al, 2001;King et al, 2001;Mackie et al, 2002;Davies et al, 2003) and cryptotephra (Chambers et al, 2004;Turney et al, 2004;Ranner et al, 2005;Gehrels et al, 2006); we use the more prevalent term, microtephra, here.…”