Secondary standards for trace element analyses for the geochemical composition of analysed tephra between 751 and 763 CE from B19, TUNU2013, and RECAP (Greenland ice cores) and correlating proximal material from Iceland

Secondary Standards of Old Crow, Sheep Track, ML3B, NIST610, and T1G for Trace element glass analyses obtained across the period 751-763 CE. Analyses were obtained by LA-ICP-MS at the University of St Andrews, UK.