. Bulletin of the British Museum (Natural History), Geology. 84 CLASSIFICATION OF BABOONS T. gelada was isolated in the Ethiopian highlands during the late Pliocene, and has never been more widespread. Certainly, all fossil material described from other regions subsequent to Makapan seems to pertain to the Simopithecus lineage. Authors have differed as to the degree of taxonomic relationship appropriate to expressing the similarities and differences between the gelada and its lowland Pleistocene relations. Andrews {1916), describing Simopithecus on the basis of the Kanjera material, recognized
. Bulletin of the British Museum (Natural History), Geology. 84 CLASSIFICATION OF BABOONS T. gelada was isolated in the Ethiopian highlands during the late Pliocene, and has never been more widespread. Certainly, all fossil material described from other regions subsequent to Makapan seems to pertain to the Simopithecus lineage. Authors have differed as to the degree of taxonomic relationship appropriate to expressing the similarities and differences between the gelada and its lowland Pleistocene relations. Andrews {1916), describing Simopithecus on the basis of the Kanjera material, recognized its affinity to the gelada, but justified generic separation on the grounds of the length of the molars and the absence of maxillary fossae. Hopwood (1934), followed Andrews' definition. Dietrich (1942) regarded Simo- pithecus as a name uncritically applied to fossil baboons ancestral to Papio, and accordingly reduced it to a subgenus of the latter. His 'Papio [Simopithecus). \^ \<s. \%. \% \ \^ N N-' , \ \ / \ V/ ly Fig. 21. Proposed evolutionary relationship of the subgenera and fossil populations of Theropithecus. The solid cylindrical segments represent the period of time over which each sample is believed to have accumulated. The arrows represent the probable range of possible chronological positions for each time-span. a. Hopefield. b. Olorgesailie. c. Kanjera. d. Olduvai IV. e. T. gelada. i. Olduvai Upper II. g. Swartkrans. h. Olduvai I. i. Kaiso. j. Omo. k. Makapan. Dotted: time-span of T. {Simopithecus) darti. Cross-hatched; time-span of T. (Simopithecus) oswaldi. Note: Information becom- ing available since this diagram was prepared indicates that the Olduvai, Upper II, Olduvai IV and Olorgesailie may be older than represented here. (See text.) (M. D. Leakey, 1971).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble
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