Estimation of mean sedimentary rates. LA-ICP-MS U–Pb dating of Carboniferous ash layers in the Cantabrian Zone (N Spain): stratigraphic implications Merino-ToméOscar Gutiérrez-AlonsoGabriel VillaElisa Fernández-SuárezJavier Martín LlanezaJaime HofmannMandy 2017 SP Table 2. Estimation of mean sedimentary rates.