Outcrops sampled by the Hell Creek Project were divided into three sections: lower, middle and upper slices. The top and bottom sections were the focus of the PLoS One report, and within each portion many remains of "Triceratops", "Edmontosaurus", and "Tyrannosaurus" were found. "Triceratops" was the most common in each section, but, surprisingly, "Tyrannosaurus" was just as common, if not slightly more common, than the hadrosaur "Edmontosaurus". In the upper Hell Creek section, for example, the census included twenty two "Triceratops", five "Tyrannosaurus", and five "Edmontosaurus".