Because Knight worked in an era when new and often fragmentary fossils were coming out of the American west in quantity , not all of his creations were based on solid evidence ; dinosaurs such as his improbably-adorned `` Agathaumas '' ( 1897 : left ) for example , were somewhat speculative .
Knight worked in an era when new and often fragmentary fossils were coming out of the American west in quantity . Understandably , not all of his creations were based on solid evidence .