A Guide to the Dinosaurs of Colorado
On Dinosaur Classification
On Scientific Names
The Basics of Taxonomy
An Introduction to Cladistcs
Taxonomy of the Dinosaurs of Colorado
Cladogram of the Dinosaurs of Colorado
About the Dinosaurs of Colorado
Geological
Time Chart
    

Genus Apatosaurus

Includes material originally referred to: Atlantosaurus, Brontosaurus, Elosaurus.

Taxonomy: Recognized Species
Class Dinosauria
  Subclass Sauropodomorpha
    Order Sauropoda
      Suborder Diplodocimorpha
        Family Diplodocidae
A. ajax Marsh, 1877
  Colorado
A. excelsus Marsh, 1879
  Wyoming, Utah, Oklahoma
A. excelsus Holland, 1915
  Utah
Species in Colorado: Apatosaurus ajax
Size: Where found:
Up to 70 feet
21 meters		 Morrison Formation of Colorado, Utah, Wyoming, and Oklahoma
Period: Age:
Late Jurassic Kimmeridgian - Tithonian
  144 to 156 Ma.
Material Found
A.ajax
Two partial skeletons, one braincase.
A. excelsus
Six partial skeletons without skulls, many postcranial pieces.
A. louisae
Two skeletons, one with skull; part of 3rd skeleton; limb elements.

Information compiled by Donald L. Blanchard

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