a lagoon. There are tracks from two types of dinosaur. The first type of tracks are from a sauropod and were made by an animal of 30 to 50 feet in length, perhaps a brachiosaurid such as Pleurocoelus, and the second tracks by a theropoda, an animal of 20 to 30 feet in length, perhaps an Acrocanthosaurus. A variety of scenarios was proposed to explain the tracks, but most likely represent twelve sauropods "probably as a herd, followed somewhat later by three theropods that may or may not have been stalking – but that certainly were not attacking." Other examples include: Dinosaur tracks, near Moab, Utah Dinosaur Footprints Reservation in Holyoke, Massachusetts, US Red Gulch Dinosaur Tracksite, Wyoming Prehistoric Trackways National Monument near Las Cruces, New Mexico Connecticut River Valley trackways, in New England Clayton Lake State Park dinosaur trackway near Clayton, New Mexico China The Gansu dinosaur trackway located in the Liujiazia National Dinosaur Geopark in Yanguoxia, China contains hundreds of tracks including 245 dinosaur, 350 theropod, 364 sauropod and 628 ornithopod tracks among others. Australia The Lark Quarry Trackway in Queensland contains three-toed tracks made by a heard of ornithopod dinosaurs crossing a river. It was once believed they respresented a large predator chasing doqn a mixed flock of small ornithopods and theropods, but this was contested in 2011. Mammal trackways Mammal trackways are among the least common trackways. Mammals were not often in mud, or riverine environments; they were more often in forestlands or grasslands. Thus the earlier tetrapods or proto-tetrapods would yield the most fossil trackways. The Walchia forest of Brule, Nova Scotia has an example of an in situ Walchia forest, and tetrapod trackways that extended over some period of time through the forest area. United States A 1.5km-long Late Pleistocene Age trackway of Human (child and adult) fossilized footprints, as well as mammoth and giant ground sloth tracks have been found at White Sands National Park. Near Alamogordo, New Mexico Australia A recent marsupial trackway site in the Colac district of Australia (west of Colac) contains marsupial trackways as well as kangaroo and wallaby tracks. Gallery of images See also Ichnites, a type of ichnite List of stratigraphic units with dinosaur tracks Formations with ichnites List of non-Dinosauria fossil trackway articles List of fossil sites References External links Texts on natural casts of dinosaur tracks found in Utah coal mines Wyoming 3-toed trackways Zimbabwe