The skull was the first Neanderthal adult cranium to be discovered and, although small, is nearly complete; it is thought to have belonged to a woman due to its gracile features. In 1926, a second Neanderthal skull was found by Dorothy Garrod at a rock shelter named Devil's Tower, very close to Forbes' Quarry. This fossil, known as Gibraltar 2, is much less complete than the Gibraltar 1 skull and has been identified as that of a four-year-old child. Further excavations at the two sites are infeasible. Quarrying at Forbes' Quarry has meant that it has been virtually denuded of Pleistocene sediments while Devil's Tower is directly under the North Front of the Rock of Gibraltar and is one of the most dangerous places on the entire peninsula due to frequent rockfalls.