. Bulletin. Natural history; Natuurlijke historie. OSTEOLOGY OF DEINONYCHUS ANTIRRHOPUS 9 catalogued as more than 50 separate entries, although they may in fact represent as few as three individuals. In spite of this, I believe that YPM 5203 (a caudal se- ries), 5205 (left and right pes), 5206 (left and right manus) and 5210 (several verte- brae and an incomplete skull and jaws) belong to a single individual because of distinctive preservation common to these alone and the fact that they are all slightly larger than other comparable elements obtained at the Yale site. However, owing to their s
. Bulletin. Natural history; Natuurlijke historie. OSTEOLOGY OF DEINONYCHUS ANTIRRHOPUS 9 catalogued as more than 50 separate entries, although they may in fact represent as few as three individuals. In spite of this, I believe that YPM 5203 (a caudal se- ries), 5205 (left and right pes), 5206 (left and right manus) and 5210 (several verte- brae and an incomplete skull and jaws) belong to a single individual because of distinctive preservation common to these alone and the fact that they are all slightly larger than other comparable elements obtained at the Yale site. However, owing to their separated occurrence in the quarry, I have no proof. Furthermore, I have no doubts that the remains listed from the Yale quarry belong to a single species and I have thus based the species diagnosis on the hypodigm and not on the type specimen alone. No precise stratigraphic data were recorded by Bamum Brown for the two specimens collected by him, but thanks to an aerial photograph (Brown, 1941: 293) and a tracing paper overlay found in the American Museum files, showing the location of these and other sites, this information has been recovered. AMNH 3015 was collected very close to the middle of a chalcedony-concretion-bearing claystone (Unit V in Ostrom, MS), the Little Sheep Mudstone Member of Mo- berly's (1960) Cloverly Formation, 21 to 24 feet ( m) below the base of a massive, grey-brown, cross-bedded sandstone (Unit VI, Ostrom, MS) and approxi- mately 103 feet (31 m) below the thin-bedded, yellow or rust-colored sand- Edwards Ranch Cashen Ranch Carbon County, Big Horn County, Montana Montana Key Sykes crostbedded s*. ttiin-bedded ss. claystone AMNH siliceous pebbles #3037 AMNH #3015 ctiert concretions . 10 . 20 30 feet FIG. 3. Stratigraphic sections at the Yale (Edwards Ranch) and American Museum (Cashen Ranch) Deinonychus localities showing the levels of the three sites. Roman numerals have been assigned to parts of the non-marine section (Morrison-CIoverly
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