. Bulletin of the British Museum (Natural History), Geology. GEBEL ZELTEN, LIBYA 77 age. Arambourg and Magnier (1961) and Arambourg (1961a and b, 1963a and b.) have consistently placed the deposits in the Burdigalian, and Arambourg (1963b) states that the Gebel Zelten deposits rest on Oligocene marine beds and are overlain by Helvetian marine beds. Savage and White (1965) indicate a Burdigalian age and this was later refined (Savage in Selley 1969) to Early Burdigalian or Late Aquitanian. Terminology In most anatomical details the terminology used follows that of Sisson and Grossman (1953). Th
. Bulletin of the British Museum (Natural History), Geology. GEBEL ZELTEN, LIBYA 77 age. Arambourg and Magnier (1961) and Arambourg (1961a and b, 1963a and b.) have consistently placed the deposits in the Burdigalian, and Arambourg (1963b) states that the Gebel Zelten deposits rest on Oligocene marine beds and are overlain by Helvetian marine beds. Savage and White (1965) indicate a Burdigalian age and this was later refined (Savage in Selley 1969) to Early Burdigalian or Late Aquitanian. Terminology In most anatomical details the terminology used follows that of Sisson and Grossman (1953). The nomenclature applied to the dentition (Text fig. i) is mainly after Arambourg (1947). In the upper molars the postero-lingual cusp, termed the hypocone by Arambourg (1947) is here termed the metaconule after Weber (1928). In the lower molars I have treated the antero-lingual corner as if the paraconid has been entirely lost, thus the antero-lingual cuspid is the metaconid with an anterior mesostylid. The 'Palaeomeryx fold' is used to define any fold of enamel which runs vertically down the postero-labial face of the protoconid into the median Fig. I. Ruminant molar and premolar cusp nomenclature, (a) Third upper premolar. (b) First upper molar, (c) Second, third and fourth lower premolars, (d) Second and third lower molars. Upper dentition, a: parastyle. b: paracone. c: metacone. d: metastyle. e: mesostyle. f: protocone. g: accessory crest, h: metaconule. i: ento- style. Lower dentition, j: mesostylid. k: metaconid. 1: metastylid. m: entoconid. n: entostylid. o: hypoconid. p: ectostylid. q: protoconid. r: parastylid. s: para- conid. t: hypoconulid. u: entoconulid. v: anterior fossette. w: posterior 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 the original British Museum (Natural History). London
Size: 1940px × 1287px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
