His work in the southern hemisphere, including
Antarctica, led to the establishment of one of the world's finest fossil collections, housed at the
Bernard Price Institute for Palaeontological Research (BPI) in Johannesburg. He contributed greatly to the
Karoo palaeontology of southern
Africa, and
Gondwana, and was an authority on the stratigraphic and distributional relationships of Permo-Triassic reptiles from South Africa. He published more than fifty papers and books on various facets of palaeontology. His contribution to Karoo palaeontology of southern Africa and Gondwana, earned him international recognition. Kitching also studied
Pleistocene mammals. In this regard he excavated and researched
fossils from several cave sites, the most notable being the
Cave of Hearths and the limeworks at
Makapansgat where he discovered the type specimen of what Professor
Raymond Dart described as a new species of the "ape man"
Australopithecus,
A. prometheus in 1947. This is now considered a synonym of the type species,
A. africanus, which Dart described in 1925. Despite not having had a standard undergraduate academic background, he was permitted by the Senate of the
University of the Witwatersrand to register for a Master of Science degree. For his research on Karoo fossils, completed in 1972, he was awarded a doctorate. Having refined the biostratigraphy of the rocks of the
Beaufort Group in South Africa, he started a major collecting project in the Triassic and Jurassic rocks of the Elliot and Clarens Formations in South Africa, and published the first biostratigraphic scheme for these lithological units as well. ==Awards and honours==