tephra SiO2 TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O total Ref Hekla 1158 Tephra 68.84 0.56 14.72 5.65 0.50 3.02 4.63 2.26 100.16 1958 Hekla 1158 Tephra 68.73 0.67 14.35 5.65 0.47 2.73 4.31 2.76 99.66 1958 Hekla 1158 Tephra 68.64 0.59 14.62 5.40 0.45 3.00 3.12 2.19 98.01 1958 Hekla 1158 Tephra 68.19 0.68 14.13 5.79 0.47 2.88 4.33 2.43 98.88 1958 Hekla 1158 Tephra 68.17 0.48 14.91 5.47 0.47 3.03 4.75 2.29 99.57 1958 Hekla 1158 Tephra 68.06 0.45 14.31 5.15 0.47 3.04 3.45 2.32 98.13 1958 Hekla 1158 Tephra 68.04 0.48 14.74 5.52 0.45 3.14 4.55 2.22 99.13 1958 Hekla 1158 Tephra 68.03 0.49 14.71 5.62 0.46 3.03 4.39 2.59 99.31 1958 Hekla 1158 Tephra 68.01 0.49 14.79 5.49 0.43 3.00 4.45 2.35 98.99 1958 Hekla 1158 Tephra 67.15 0.49 14.14 5.68 0.51 2.88 4.67 2.28 97.78 1958 Hekla 1158 Tephra 66.31 0.51 14.43 5.50 0.44 2.96 4.35 2.42 96.92 1958 Hekla 1158 Tephra 65.60 0.51 14.15 5.55 0.50 2.92 4.53 2.26 96.00 1958 Hekla 1158 Tephra 64.79 0.39 14.40 5.16 0.47 2.99 4.47 2.00 94.66 1958 ------------------------------------------------------------------------ 1958: Pilcher, J., Bradley, R. S., Francus, P. and Anderson, L. (2005) A Holocene tephra record from the Lofoten Islands, Arctic Norway. Boreas 34, 136-156.