| Summary: | The Puig de la Banya del Boc volcano is located in the southern sector of the Garrotxa Volcanic Field in the NE of the Iberian Peninsula and is part of the European Cenozoic Rift System. This monogenetic volcano was constructed on a hard basement of Paleozoic metamorphic rocks and shows a complex eruptive succession with phreatomagmatic, Strombolian, and effusive phases. Similar to other volcanoes of the same volcanic field, the succession of deposits of the Puig de la Banya del Boc volcano reveals the influence of the substrate, upon which the volcano forms, on eruption dynamics. In this case, the Paleozoic basement and its particular hydrodynamic properties controlled the way in which magma/water interactions occurred throughout the eruption. This volcano is coeval with the Clot de l'Omera, a small maar-type edifice that was emplaced on a conjugate fault, which belongs to the same fault system. D.P. is grateful for his Beatriu de Pinós (2016BP 00086) and Juan de la Cierva (IJCI-2016-30482) contracts. We are grateful to the Garrotxa Volcanic Zone Natural Park and its staff for their support throughout this study. This manuscript was greatly improved by comments and suggestions from the chief-editor José Luis Macías, Pierre-Simon Ross, and one anonymous reviewer. English text was corrected by Dr. Grant George Buffett of Terranova Scientific (www.terranova.barcelona). This research is part of the PTI VOLCAN initiatives. Peer reviewed
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