Benthic agglutinated foraminifera from the Chipaque Formation and the Guadalupe Group indicate broad age ranges from Turonian to Campanian. Associations previously known from abyssal depths and turbiditic environments, are reported for the first time from estuarine and shallow marine deposits, showing that the paleoecology of the group can not be restricted to specific depths. When the populations of benthic agglutinated foraminifera were grouped into infaunal and epifaunal according to the morphology of the test, it was found that the available oxygen levels at the sea bottom could have controlled their distribution. The evidence suggests that the associations dominated by the epifaunal morphogroup indicate low oxygen levels.