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Length:6 feet (1
recognized its importance and published his discovery in the journal Nature in 1925
Location: Colorado
Agriotherium was along with the short-faced bear
Dactylioceras commune, ammonite Troodon Length:6 feet (1Dactylioceras was a widespread genus of ammonite from the Lower Jurassic period. They are generally small, averaging 2. 6 inches in diameter. Dactylioceras has a strong, ribbed shell. The ribs are slightly inclined forward, running over the outer edge, and either simple or forking at outer end. Though it eventually died out 180 million years ago, their style of ribbing was copied by numerous subsequent ammonite genera until the whole group became