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In 1877, Othniel Charles Marsh published notes on his discovery of the Apatosaurus, and then in 1879 described another, more complete dinosaur - the Brontosaurus. In 1903, it was discovered that the Apatosaur was in fact a juvenile Brontosaurus, and the name Apatosaurus, having been published first, was deemed to have priority as the official name; Brontosaurus was relegated to being a synonym. The name was not formally removed from the records of paleontology until 1974.

It has been assumed that the Apatosaurus was living partly in water or swamps because it would have been impossible for it to support its own weight, but recent findings do not support this. In fact like its relative Diplodocuscarnegiei (Hatcher, 1901) D. hayi (Holland, 1924) D. longus (Marsh, 1878; holotype) Diplodocus ( Latin: "double-beam") is a type of dinosaur of subgroup Sauropoda. Diplodocus lived during the Jurassic period. Scientists gave the dinosaur its name due to t, Apatosaurus was a grazingGrazing is the regular consumption of part of one organism without killing it by another organism. Grazing differs from predation because the organism being eaten is not killed and differs from the feeding of parasites by the fact that the two organisms d animal with a very long neck, and a long tail as a counterweight, possibly living in herds as fossilized footprints show. To aid in processing food, Apatosaurus swallowed gizzard stones ( gastrolithGastroliths (gizzard stones) are rocks which are usually found in association with fossils of herbivorous animals thought to lack teeth, such as birds or, further in the past, dinosaurs. They are generally smooth and round, with an oily feel. Geologists us) the same way many birds do today - its jaws alone were not sufficient to chew tough plant fibers.

Fossils of this animal have been found in Nine Mile Quarry and Bone Cabin Quarry in WyomingWyoming State nickname: Equality State Other U. States Capital Cheyenne Largest City Cheyenne Governor Dave Freudenthal Area Total Land Water % water Ranked 10th 253,554 km² 251,706 km² 1,851 km² 0. 7% Population Total ( 2000) Density Ranked 50th 493,782 at sites in UtahUtah ( In Detail) (Full size) State nickname: Beehive State Other U. States Capital Salt Lake City Largest City Salt Lake City Governor Olene Walker Area Total Land Water % water Ranked 13th 220,080 km² 212,988 km² 7,092 km² 3. 2% Population Total ( 2000) and in OklahomaOklahoma ( In Detail) (Full size) State nickname: Sooner State Other U. States Capital Oklahoma City Largest City Oklahoma City Governor Brad Henry Area Total Land Water % water Ranked 20th 181,196 km² 178,023 km² 3,173 km² 1. 8% Population Total ( 2000), USAThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in.

Other Apatosaurus species:

• A. ajax - found in Colorado
• A. excelsus (originally "Brontosaurus")
• A. louisae - found in Colorado
• A. yahnahpin - found in Wyoming

Note: Robert T. BakkerRobert T. Bakker Bob Bakker , born in Bergen, New Jersey, 1945, is a famous American paleontologist who has helped re-shape modern theories about dinosaurs, particularly by adding support to the theory that some dinosaurs were homeothermic (warm-blooded). (1998) made A. yahnahpin the type species of a new genus, Eobrontosaurus.