Abstract
Abstract Two outcrop sections from the Maastrichtian Colon and Mito Juan Formations were analyzed for dinoflagellate cyst biostratigraphy. Samples from the Rio Molino section (Cesar‐Rancheria Basin, Colombia) represent a subset of samples from the 240 m‐thick hemipelagic limestones and calcareous mudstones reported in Martinez's (1989) foraminiferal study. The upper Campanian, lower Maastrichtian and uppermost Maastrichtian intervals were identified in this section based on some significant dinocyst biostratigraphic events, which are in agreement with planktonic foraminiferal data. In ascending Stratigraphic order these events include the lowest occurrence (LO) of Areoligera spp., LO of Senegalinium spp., highest occurrence (HO) of Trichodinium castanea, HO of Xenascus ceratioides, LO of Cerodinium diebelii, LO of Trithyrodinium evittii, HO of Odontochitina operculata, LO of Phelodinium tricuspe, HO of Palaeohystrichophora infusorioides, LO of Glaphyrocysta perforala, LO of Disphaerogena carposphaeropsis ...
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