Sonorasaurus (Greek for "Sonora Desert lizard"); pronounced so-NOR-ah-SORE-us
Woodlands of North America
Middle Cretaceous (100 million years ago)
Size and Weight:
About 50 feet long and 10-15 tons
Extremely long neck; long forelimbs and short hind limbs
There wasn't much special about the appearance of Sonorasaurus, which adhered to the basic body plan of Brachiosaurus-like sauropods: an extremely long neck and a thick trunk supported by significantly longer front than back legs. What makes Sonorosaurus interesting is that its remains date from middle Cretaceous North America (about 100 million years ago), a relatively sparse stretch of time when it comes to sauropod fossils. By the way, the euphonious name of this dinosaur derives from Arizona's Sonora Desert.