Amargasaurus ("La Amarga lizard") is a genus of dicraeosaurid sauropod dinosaur from the Early Cretaceous Period (130-125 mya) of what is now South America. It was small for a sauropod, reaching 10 meters (33 feet) length. It would have been a quadrupedal herbivore with a long, low skull on the end of a long neck, much like its relative Dicraeosaurus. However, this dinosaur sported two parallel rows of tall spines down its neck and back, taller than in any other known sauropod. These spines have been reconstructed supporting skin sails, but the "skin sail" hypothesis has been rejected.

Apatosaurus, also formerly known as Brontosaurus, is a genus of sauropod dinosaur that lived about 150 million years ago, during the Jurassic Period (Kimmeridgian and Tithonian ages). It was one of the largest land animals that ever existed, with an average length of 23 meters (75 ft) and a mass of at least 23 metric tons (25 short tons). The skull was small in comparison with the size of the animal. The jaws were lined with spatulate teeth, which resembled chisels, suited to a herbivorous diet.

Argentinosaurus is a genus of sauropod dinosaur first discovered by Guillermo Heredia in Argentina. The dinosaur lived on the island continent of South America around 100 million years ago, during the middle of the Cretaceous Period.

Barosaurus was a large but fairly typical diplodocid that lived during the Late Jurassic period, around 150 million years ago. In fact, in many respects Barosaurus was very similar to Diplodocus itself, but with slight differences: rather less tall backbones (vertebrae), a shorter tail, and a much longer neck. Probably more than four-fifths of this plant-eater's total length of perhaps 27 m (89 ft) was neck and tail. Presumably it had a small head, although unfortunately no specimen of its skull has been recovered, which is common in sauropods because of the small skull size.

Brachiosaurus ("Arm lizard"), was a genus of sauropod dinosaur that lived during the Late Jurassic Period and possibly the Early Cretaceous Period. It was named thus because its forelimbs were longer than its hind limbs. Brachiosaurus had spatulate teeth (resembling chisels), well-suited to its herbivorous diet. Its skull featured a number of holes, probably aiding weight-reduction. The first toe on its front foot and the first three toes on its hind feet were clawed. One of the largest animals known to have walked the earth, it has become one of the most famous of all dinosaurs and is recognized worldwide.

Camarasaurus ("Chambered lizard") was a genus of quadrupedal, herbivorous dinosaurs. It was the most common of the giant sauropods to be found in North America but only average in size: about 18 meters (60 ft) in length as adults, and weighing up to 18 tonnes (19.8 tons). It lived in the late Jurassic Period (late Oxfordian to Tithonian stages), between 155 and 145 million years ago. A Camarasaurus pelvis recovered from Dinosaur National Monument in Utah shows gouging attributed to Allosaurus.

Diplodocus lived in what is now western North America at the end of the Jurassic Period. Diplodocus is one of the more common dinosaur fossils found in the Upper Morrison Formation, a sequence of shallow marine and alluvial sediments deposited about 150 to 147 million years ago, in what is now termed the Kimmeridgian and Tithonian stages. The Morrison Formation records an environment and time dominated by gigantic sauropod dinosaurs such as Camarasaurus, Barosaurus, Apatosaurus and Brachiosaurus. Diplodocus is among the most easily identifiable dinosaurs, with its classic dinosaur shape, long neck and tail and four sturdy legs. For many years, it was the longest dinosaur known. Its great size may have been a deterrent to the predators Allosaurus and Ceratosaurus: their remains have been found in the same strata, which suggests they coexisted with Diplodocus.

Dicraeosaurus ("Bifurcated, double-headed lizard") is a genus of small diplodocoid. It was named for the spines on the back of the neck. Unlike most diplodocoids, Dicraeosaurus had a large head with a relatively short and wide neck. It also lacked the whiplash tail that other diplodocids had. It was smaller, at only reached 41 feet (12 m) in length. Dicraeosaurus lived in the Late Jurassic. It was herbivorous; however, it didn’t compete with other dinosaurs for vegetation. Fossils have been discovered in the rocks of Tendaguru Hill in Tanzania. The rocks also yield fossils of Brachiosaurus and Kentrosaurus. As these were much larger animals, they would probably have browsed different levels of the local vegetation, allowing them to co-exist without significant competition.

Jobaria was a sauropod dinosaur discovered in the Sahara Desert in 1997, and is one of the most completely known Cretaceous sauropods. It was named after "Jobar", a creature of local legends, and is thought to have been about 18 metres long. It lived in the Early Cretaceous. Unusually for its late occurrence, Jobaria seems to be a very primitive sauropod. It has been interpreted either as a basal macronarian, or as a non-neosauropod eusauropod, basal to the neosauropod clade. The backbone and tail of Jobaria are simple compared to the complex vertebrae and whiplast tail of the older North America sauropods Diplodocus and Apatosaurus. Unlike other Cretaceous sauropods, Jobaria had spoon-shaped teeth.

Mamenchisaurus was a plant-eating four-legged dinosaur, known for its remarkably long neck. Most species lived 145 to 150 million years ago, in the Tithonian age of the late Jurassic Period. Mamenchisaurus was first discovered in 1952 on a highway construction site in Sichuan, China. The partial skeleton fossil was then studied, and named in 1954, by the renowned Chinese paleontologist Professor Yang Zhongjian (C. C. Young).