The fossils and sediments from Ashfall Fossil Beds State Historical Park are analyzed to determine whether the depositional environment was Flood or post-Flood. Several indications of a post-Flood environment are presented, but other criteria suggest the fossil beds were laid down by the Flood, and evidence for a post-Flood environment can be explained within a Flood model. Like dinosaur tracks, eggs, nests, and bonebeds, this site can be explained as a landscape briefly exposed during the Flood by local or regional fall in "sea level." The existence of mammal tracks places the time as early Flood.