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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
-Chapa, Pages
from:-Chapa
Paleocanyons in the Subsurface of Eastern Mexico: Facts and Uncertainties
Abelardo Cant-Chapa
Instituto Politcnico Nacional, Mexico City, Mexico
ABSTRACT
correlation
of stratigraphic sections. The methods used to define the Chicontepec
paleocanyon are questioned here, and its existence at the original proposed location is
rejected on the basis of the following criteria: (1) the unconformity surface does not
reveal the absence of lithologic formations; (2) the correlated stratigraphic sections
lack accurate chronostratigraphic control; (3) Paleocene-Eocene lateral facies changes are
erroneously considered unconformities; (4) the so-called reference horizon, Horizon C (top
lower Eocene), for the stratigraphic
correlation
is not documented with lithostratigraphic
and
biostratigraphic
data; and (5) the marks on check-shot points used to determine the
contact between the Paleocene-lower Eocene formations are not accurate.
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