<Table> <Tr> <Th_colspan="2"> Olduvai Gorge </Th> </Tr> <Tr> <Td_colspan="2"> Oldupai Gorge </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> Olduvai Gorge Olduvai Gorge in Tanzania </Td> </Tr> <Tr> <Th> Long - axis length </Th> <Td> 48 kilometres (30 mi) </Td> </Tr> <Tr> <Th_colspan="2"> Geography </Th> </Tr> <Tr> <Th> Coordinates </Th> <Td> 2 ° 59 ′ 37" S 35 ° 21 ′ 04" E ﻿ / ﻿ 2.993613 ° S 35.35115 ° E ﻿ / - 2.993613; 35.35115 Coordinates: 2 ° 59 ′ 37" S 35 ° 21 ′ 04" E ﻿ / ﻿ 2.993613 ° S 35.35115 ° E ﻿ / - 2.993613; 35.35115 </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Olduvai Gorge </Th> </Tr>

Who discovered the bones of a hominid 1.8 million years old at olduvai gorge