 Clarke saw foot bones discovered in 1998 which confirmed this initial assessment.His description, according to the known Laetoli footprints of "Australopithecus" and the arrangement of the foot bones discovered in the Silberberg Grotto, exhibits a high degree of compliance.In his 1999 description of the fossil bones of the hand, Clarke pointed out that the length of the palm of the hand as well as the length of the finger bone was significantly shorter than that of chimpanzees and gorillas.