Urrutia-Fucugauchi, J.; Alcalá-Herrera, J. A.; Córdova, C.; Machain-Castillo, Ma. L.; Gío-Argaez, F. R.
(Sociedad Mexicana de Historia Natural, 1997)
Organic matter δ13 from a sedimentary sequence in the Cuenca de México is reported and used in paleoenvironmental interpretation. We studied 280 cm of a silty-clay. sedilliciltary sequence with some sand and ash interbeded ...