page_title: Supersaurus
section_title: Description
hierarchical_section_title: Supersaurus / Description
context_page_description: Supersaurus is a genus of diplodocid sauropod dinosaur that lived in North America during the Late Jurassic period. The type species, S. vivianae, was first discovered by Vivian Jones of Delta, Colorado, in the middle Morrison Formation of Colorado in 1972. The fossil remains came from the Brushy Basin Member of the formation, dating to about 153 million years ago. A potential second species, S. lourinhanensis, is known from Portugal and has been dated to a similar time.
context_section_description: Supersaurus is among the largest dinosaurs known from good remains, possibly reaching 33–34 meters (108–112 ft) in length, and a weight of 31.8–36.3 metric tons (35.1–40.0 short tons).
  The first described specimens of Supersaurus were individual bones that suggested a large diplodocid. A large cervical vertebra BYU 9024 from the same quarry was later assigned to Supersaurus. This vertebra measures 1,380 millimeters (54 in) and is the longest cervical known. However more recently this enormous vertebra has been reclassified as a Barosaurus vertebra, by Mike Taylor and Matt Wedel.
  The assignment of the more complete specimen, WDC DMJ-021, to Supersaurus suggests that in most respects it was very similar in anatomy to Apatosaurus but less robustly built with especially elongated cervical vertebrae, resulting in one of the longest known sauropod necks.
caption: Diagram showing the size of Supersaurus (orange) compared with selected giant sauropods