10.6084/m9.figshare.6977858.v1 Giulia Bosio Giulia Bosio Anna Gioncada Anna Gioncada Elisa Malinverno Elisa Malinverno Claudio Di Celma Claudio Di Celma Igor M. Villa Igor M. Villa Giuseppe Cataldi Giuseppe Cataldi Karen Gariboldi Karen Gariboldi Alberto Collareta Alberto Collareta Mario Urbina Mario Urbina Giovanni Bianucci Giovanni Bianucci Fig. S1: <sup>39</sup>Ar–<sup>40</sup>Ar step heating results. Chemical and petrographic fingerprinting of volcanic ashes as a tool for high-resolution stratigraphy of the upper Miocene Pisco Formation (Peru) Geological Society of London 2018 Fig Miocene Pisco Formation petrographic fingerprinting LB-T Ar Geology 2018-08-17 03:18:24 Journal contribution https://geolsoc.figshare.com/articles/journal_contribution/Fig_S1_sup_39_sup_Ar_sup_40_sup_Ar_step_heating_results_Chemical_and_petrographic_fingerprinting_of_volcanic_ashes_as_a_tool_for_high-resolution_stratigraphy_of_the_upper_Miocene_Pisco_Formation_Peru_/6977858 Fig. S1: <sup>39</sup>Ar–<sup>40</sup>Ar age spectrum of the biotite separate of the tephra layer LB-T11.