Apatosaurus "Apatosaurus" may have been more solitary than other Morrison Formation dinosaurs. Fossils of the genus have only been found in the upper levels of the formation. Those of "Apatosaurus ajax" are known exclusively from the upper Brushy Basin Member, about 152–151 mya. "A.louisae" fossils are rare, known only from one site in the upper Brushy Basin Member; they date to the late Kimmeridgian stage, about 151mya. Additional "Apatosaurus" remains are known from similarly aged or slightly younger rocks, but they have not been identified as any particular species, and thus may instead belong to "Brontosaurus". The Morrison Formation records a
The Known Lands once-proud race decimated and beaten. Now the Known Lands struggle with the repercussions of a dwarven-created plague gone awry, the 'Culling' of the halflings in their own land, and strange and unknown forces that have brought new challenges to the peoples of the world. Many strange and unique societies and organizations have sprung up. Many parts of The Known Lands remain unexplored, though legends of wild barbarian elves and halflings, strange draconic followers, people who sail the oceans, never stepping off their ships, are commonly heard in taverns and marketplaces of The Known Lands. TKL makes use of some of