. Athlon : essays on palaeontology in honour of Loris Shano Russell. Paleontology. WANN LANGSTON, JR. 117 Depositional Environment The Cretaceous sediments at Scabby Butte were deposited during the last general retreat of the Bearpaw Sea from the Western Canadian Sedimentary Basin (McCrossan et al., 1964). The situation is best described by Jeletzky (1971, p. 72): "... as the late upper Campanian Bearpaw Sea retreated the blanket of early Maestrichtian nonmarine rocks of the St. Mary River and Edmonton (including upper Brazeau) Formation spread eastward across the Southern Great Plains. F
. Athlon : essays on palaeontology in honour of Loris Shano Russell. Paleontology. WANN LANGSTON, JR. 117 Depositional Environment The Cretaceous sediments at Scabby Butte were deposited during the last general retreat of the Bearpaw Sea from the Western Canadian Sedimentary Basin (McCrossan et al., 1964). The situation is best described by Jeletzky (1971, p. 72): "... as the late upper Campanian Bearpaw Sea retreated the blanket of early Maestrichtian nonmarine rocks of the St. Mary River and Edmonton (including upper Brazeau) Formation spread eastward across the Southern Great Plains. Farther northeast the great lobe of the Edmonton Delta was spreading steadily southeastward, eastward, and ; The lowest exposed rocks appear in a few gullies at the lower prairie level at the base of the escarpment. They are dark gray joint clays and shales that contain the brackish-water clam Corbula perangulata Whiteaves and are assigned to the basal member of the St. Mary River Formation (Tozer, 1956).. 3 x • DRUMHELLER ~\ Calgary 2 X • CARMANGAY NOBIEFORO • n LETHBRIDGE Fig. 1 Map of southern Alberta showing location of Scabby Butte (1) and other localities where Pachyrhinosaurus remains have been found: (2) on Little Bow River; (3) below Munson on the Red Deer River. Scabby Butte is in the St. Mary River Formation; Little Bow and Red Deer River localities are in the approximately equivalent Maestrichtian lower Edmonton (= Horseshoe Canyon) 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 Churcher, C. S. , 1928-; Russell, Loris Shano, 1904-; Royal Ontario Museum. Toronto : ROM
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