Community established best practice recommendations for tephra studies-from collection through analysis by Wallace, KL, Bursik, MI, Kuehn, S, Kurbatov, AV, Abbott, P, Bonadonna, C, Cashman, K, Davies, SM, Jensen, B, Lane, C, Plunkett, G, Smith, VC, Tomlinson, E, Thordarsson, T, Walker, JD