Nonetheless, "H. rudolfensis" and "H. habilis" generally are recognised members of the genus at the base of the family tree, with arguments for synonymisation or removal from the genus not widely adopted. Though it is now largely agreed upon that "Homo" evolved from "Australopithecus", the timing and placement of this split has been much debated, with many "Australopithecus" species having been proposed as the ancestor. The discovery of LD 350-1, the oldest "Homo" specimen, dating to 2.8 mya, in the Afar Region of Ethiopia may indicate that the genus evolved from "A. afarensis" around this time. The species LD 350-1 belongs to could be the ancestor of "H. rudolfensis" and "H. habilis", but this is unclear. Based on 2.1 million year old stone tools from Shangchen, China, possibly an ancestral species to "H. rudolfensis" and "H. habilis" dispersed across Asia.