the Aptian and Albian stages, suggesting a similar age for the Antlers. Therefore, Acrocanthosaurus most likely existed between 125 and 100 million years ago. During this time, the area preserved in the Twin Mountains and Antlers formations was a large floodplain that drained into a shallow inland sea. A few million years later, this sea would expand to the north, becoming the Western Interior Seaway and dividing North America in two for nearly the entire Late Cretaceous. The Glen Rose Formation represents a coastal environment, with possible Acrocanthosaurus tracks preserved in mudflats along the ancient shoreline. As Acrocanthosaurus was a large predator, it is expected that it had an extensive home range and lived in many different environments in the area. Potential prey animals include sauropods like Astrodon or possibly even the enormous Sauroposeidon, as well as large ornithopods like Tenontosaurus. The smaller theropod Deinonychus also prowled the area but at in length, most likely provided only minimal competition, or even food, for Acrocanthosaurus. References Carcharodontosaurids Albian life Aptian life Early Cretaceous dinosaurs of North America Fossil trackways Cloverly fauna Paleontology in Maryland Paleontology in Oklahoma Paleontology in Wyoming Paleontology in Texas Fossil taxa described in 1950 Taxa named by J. Willis Stovall Taxa named by Wann Langston Jr. Articles containing video clips Apex predators