1026-8774 1026-8774 S1026-87742018000200142 10.22201/cgeo.20072902e.2018.2.559 Mexico Mexico 00 00 2018 00 00 2018 35 2 142 157

1985 12 21-47 1999 396 396 15-9 2003 2002 27 2007 422 422 261-86 1996 37-82 2003 367 367 1-15 2003 367 367 157-203 1976 97 1996 110 2011 165-71 2016 68 2 2 283-304 2016 72 72 191-226 1984 1974 2002 LV 1 1 38-94 1985 51-77 INEGI (Instituto Nacional de Estadística Geografía e Informática) 1984 1954 65 937-8 2015 57 39-48 2009 327 327 55-69 2006 2010 NACSN (North American Commission on Stratigraphic Nomenclature) 2005 89 11 11 1547-91 2017 69 29 29 385-408 1983 193 193 1981 9 41-3 2014 283 283 36-65 1996 83-124 2015 41 4 4 353-69 1995 23-34