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 the various sentient races have built nations and civilizations. It is a time of peace and prosperity. But though peace reigns over much of The Known Lands, it is not a time of tranquility. In the past fifty years, The Known Lands have been shocked with the realization that below their islands exists a subterranean world at least as large as their own – the Underdark. A formerly unknown race, the drow, has twice come into the Known Lands from this underworld. Two massive attacks by the drow have all but destroyed the citadel homelands of the dwarves, leaving that