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Triceratops adalah jenis dinosaurus bertanduk tiga yang berbadan besar. Panggilan pendeknya Tritop. Dinosaurus ini jarang lari ketakutan karena Tyrannosaurus, karena biasanya mereka melindungi diri mereka dengan tanduknya yang tajam. Pernah disebut sebagai dinosaurus ksatria, karena bentuk kombinasi kepala dan tanduknya membuat dirinya seperti seorang ksatria dengan pedang dan tameng. Sebutan ini ada benarnya, karena kulit yang berada pada posisi ‘tameng’ amatlah keras. Selain itu tanduknya yang tajam mampu membuat lawan ketakutan

The Hell Creek Formation is an intensely-studied division of Upper Cretaceous to lower Paleocene rocks in North America, named for exposures studied along Hell Creek, near Jordan, Montana.

The Hell Creek Formation occurs in Montana and portions of North Dakota, South Dakota, and Wyoming. In Montana, the Hell Creek Formation overlies the Fox Hills Formation and is the uppermost formation of the Cretaceous period. "Pompey’s Pillar" at the Pompeys Pillar National Monument is a small isolated section of the Hell Creek Formation.
The Hell Creek Formation is well exposed in the badlands in the vicinity of Ft. Peck Reservoir.

It is a series of fresh and brackish-water clays, mudstones, and sandstones deposited during the Maastrichtian, the last part of the Cretaceous period, by fluvial activity in fluctuating river channels and deltas and very occasional peaty swamp deposits along the low-lying eastern continental margin fronting the late Cretaceous Western Interior Seaway. The climate was mild, and the presence of crocodilians suggests a sub-tropical climate, with no prolonged annual cold. The famous iridium-enriched K-T boundary, which separates the Cretaceous from the Cenozoic, occurs as a discontinuous but distinct thin marker bedding within the Formation, near its uppermost strata.

Commercial excavations bring Hell Creek fossils onto the market, usually dinosaur teeth, crocodylian osteoderm fragments, and dermal plates of fossil gars. A representative selection of Hell creek fossils can be seen at the Museum of the Rockies, in Bozeman, Montana.

The formation has produced impressive assemblages of invertebrates, plants, mammals, fish, reptiles, and amphibians. Notable dinosaur finds include Tyrannosaurus and Triceratops. The most complete Hadrosaurid dinosaur ever found was retrieved in 2000 from the Hell Creek Formation and widely publicised in a National Geographic documentary aired in December 2007. A few bird, mammal, and pterosaur fossils have also been found. Teeth of sharks and rays are sometimes found in the riverine Hell Creek Formation, suggesting that some of these taxa were tolerant of fresh water then as now.