PantojaAlor, J; Oloriz, F; Villasenor, AB; GarcíaBarrera, P; GonzálezArreola, C
(1996)
The presence of Pseudohaploceras liptoviense (ZEUSCHNER) associated to Palorbitolina lenticularis is (BLUMENBACH) permits to interpret an Early Aptian age for the middle part of the lower member of the Cumburindio Formation ...