I have focused
on phylogenetic and evolutionary aspects of Cretaceous planktonic foraminifera.
I am currently working on problems related to the evolution, biological
transformation and extinction of Cretaceous planktonic foraminifera. My
main goal is to relate the processes of biological transformation to both
terrestrial and extraterrestrial causes.
of my paleobiological investigations includes global biological changes
in the Cretaceous. My goal here is to investigate the relationship between
changes in biodiversity through time and biological changes observed in
the stratigraphic record and their possible relations to global astronomical
Some of the
results of my paleobiological investigations include: 1) The establishment
of a cladistic approach in the study of planktonic foraminifera. 2) The
recognition of biological transformation such as neoteny among planktonic
foraminifera before the major extraterrestrial impact. 3) The definition
of a standard
biochronology for the K/T boundary event in Mexico. 4) The periodicity
in planktonic foraminiferal evolutionary trends.
Forams in thin section || The
Nature of the K/T Boundary in Mexico || Records
of Forams'98 ||