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Triceratops Gallery
2. Epoccipital Frill Bone
1065 Fd. Hell Creek Formation, Montana, USA
Drawing of Triceratops Skeleton [3]
1. Quadratojugal Bone
1070b Fd. Hell Formation, Montana, USA
Triceratops Frill Bone Piece
1091 Fd. Lance Creek Formation, Wyoming, USA
Triceratops Tooth with Root in Matrix
1090 Fd. Lance Creek Formation, Wyoming, USA
Triceratops Tooth in Matrix
1096 Fd. Lance Creek Formation, Wyoming, USA
Triceratops Tooth in Matrix
1093 Fd. Lance Creek Formation, Wyoming, USA
Triceratops Tooth in Matrix
1094 Fd. Lance Creek Formation, Wyoming, USA
Triceratops Tooth in Matrix
1095 Fd. Lance Creek Formation, Wyoming, USA
Piece on left side of tooth is not part of this matrix.
Triceratops Skull Tooth
1038 Fd. Hell Creek Formation, E. Montana, USA
Drawing of Triceratops Head Bones [4]
Fd. Specimen Montana, USA
Triceratops is an extinct quadrupedal dinosaur with three horns and a large bony frill on the back of its head that lived in what is now western North America. The horn over their nostrils was small and those over their eyes may have grown to over three feet long as they mature. Their heads were among the largest of all land animals being about one third of the length of their bodies. They had relatively short tails as compared to other dinosaurs. By adulthood, Triceratops is estimated to have grown to 30 feet long and 10 feet high. Their limbs were stout with the hind limbs larger.
There is little question that they were herbivores with beaks to snip off vegetation and groups of teeth behind to grind up their food. Each side of their jaw had 36 to 40 tooth columns with 3 to 5 stacked teeth per column and teeth were continually being replaced.[1]
It is uncertain but likely that Tyrannosaurus Rex was a predator of Triceratops based on some indications of teeth marks on its fossils. Triceratops may have been able to ward off attacks by inflicting severe or fatal damage to the predator with its large horns.
Triceratops fossils have been found in the USA (Montana, South Dakota, North Dakota, Colorado, and Wyoming) and Canada (Saskatchewan and Alberta). [2] No whole Triceratops skeletons have been found. Their skull fossils, both complete and partial, are fairly common while fossils of other parts of their skeleton are much less common. As no fossilized Triceratops eggs have been found, their mode of birth is uncertain. In the past, a number of fossils have been found that were thought to be species similar to Triceratops but may in fact be just different changes in Triceratops as it aged and/or differences between male and female skeletons.
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[1] Triceratops,

[2] Castro, Joseph, Triceratops: Facts About the Three-Horned Dinosaur,

[3] Von Zittel, Karl, Text-book of Paleontology, (New York: The MacMillan Company, 1902), 244, black background added
[4] ibid., 245 cleaned of notations then two new notations added
Triceratops Rib Section
1088 Fd. Lance Creek Formation, Wyoming, USA
Triceratops Process Fragment
1394 Fd. Hell Creek Formation, (Montana?), USA
(Triceratops?) Toe Phalanx
Wyoming, USA
Triceratops Occipital Process
Allows head to pivot on atlas vertebra
1719 Fd.Lance Creek Formation, Wyoming, USA
3.4" dia. x 3.4"
Triceratops Caudal Vertebra
All processes are missing.
1064 Fd. Hell Creek Formation, Montana, USA
4.8"x 3.5"x 2.7"