Alamosaurus
Alamosaurus (; meaning "Ojo Alamo lizard") is a genus of titanosaurian sauropod dinosaurs, containing a single known species, Alamosaurus sanjuanensis, from the late Cretaceous Period of what is now southern North America. Isolated vertebrae and limb bones indicate that it reached sizes comparable to "Argentinosaurus" and "Puertasaurus", which would make it the largest dinosaur known from North America. Its fossils have been recovered from a variety of rock formations spanning the Maastrichtian age of the late Cretaceous period. Specimens of a juvenile "Alamosaurus sanjuanensis" have been recovered from only a few meters below the Cretaceous-Paleogene boundary in Texas, making it among the last surviving non-avian dinosaur species.
Earl Douglass
Douglass played a central role in one of the most important fossil finds in North America. In 1905, he was sent to Minnesota, North Dakota, Montana, and Idaho to collect vertebrate and invertebrate fossils. Additionally, he obtained data to solve certain geological problems and conduct geological explorations. In 1907, Douglass traveled to the Uintah Basin in northeastern Utah to explore fossiliferous strata. Later in 1908, he explored the hills along the Green River near Jensen, Utah and came upon with the tail section of an Apatasaurus in the Morrison Formation. The following year while searching fossils for the Carnegie Museum, he discovered a formation layered with prehistoric plant and animal fossils. In the summer of 1909, Earl traveled to Utah to search for dinosaur skeletons , where he discovered his famous dinosaur at the Utah quarry. The dinosaur was formally named "Apatosaurus louisae", after Carnegie’s wife Louise. In the same year, while climbing the Split Mountain near Jenson, Utah he found eight large vertebrae partially embedded in the rock, which turned out to be the entire body of a brontosaur nearly 70 feet long.