Adrienne Mayor, a classical folklorist and historian of science, has speculated that the way the Greeks imagined griffins from the seventh century BC onwards may have been influenced in part by the fossilized remains of beaked dinosaurs such as "Protoceratops" observed on the way to gold deposits by nomadic prospectors of ancient Scythia (Central Asia), This speculation is based on Greek and Latin literary sources and related artworks in a specific time frame, beginning with the first "written" descriptions of griffins as real animals of Asia in a lost work by Aristeas (a Greek who traveled to the Altai region between Mongolia and NW China in the 7th century BC) referenced by Aeschylus and Herodotus (ca. 450 BC) and ending with Aelian (3rd century AD), the last ancient author to report any "new" details about the griffin.