THE MID-CARBONIFEROUS BOUNDARY IN NORTHERN SPAIN: DIFFICULTIES FOR CORRELATION OF THE GLOBAL STRATOTYPE SECTION AND POINT. RIPS [Internet]. 31 marzo 2006 [citato 27 luglio 2026];112(1). Disponibile su: https://test-ojs-unimi-it.archicoop.it/index.php/RIPS/article/view/5847