. Bulletins of American paleontology. 156 Bulletin 369. Text-figure 5.—Stratigraphic cross-section of the Beaverhill Lake Group from the Pan American Home Archie 4-1-66-SW5 well into the Judy Creek reef complex (well 4-35-63-11W5). T-R cycle boundaries correspond to the base of radioactive intervals on the gamma ray logs. The cross-section illustrates the parallelism of the T-R cycle and conodont zone boundaries. See Text-fig. 2 for location of the transect. The bases of conodont zones, norrisi, and MN 1 through MN 4, are marked. The numbers 1 through 4 mark the only and/or the first occurrenc
. Bulletins of American paleontology. 156 Bulletin 369. Text-figure 5.—Stratigraphic cross-section of the Beaverhill Lake Group from the Pan American Home Archie 4-1-66-SW5 well into the Judy Creek reef complex (well 4-35-63-11W5). T-R cycle boundaries correspond to the base of radioactive intervals on the gamma ray logs. The cross-section illustrates the parallelism of the T-R cycle and conodont zone boundaries. See Text-fig. 2 for location of the transect. The bases of conodont zones, norrisi, and MN 1 through MN 4, are marked. The numbers 1 through 4 mark the only and/or the first occurrences, of the cited conodont species. Western Shelf Swan Hills carbonates on the Western Shelf consist of cyclic repetitions of shallow-marine limestones and dolostones. These carbonate successions lack the ar- gillaceous limestones and calcareous shales that typify the basal portion of T-R cycles on the Eastern Shelf and in the Central Alberta Basin. As a result, cycle boundaries on the Western Shelf have no wireline-log signature and can only be identified by the examina- tion of cores. Therefore, the cycle architecture of Swan Hills carbonates can only be discerned in areas with good well and core control. Also, lacking the log sig- nature of T-R cycles on the Eastern Shelf Domain, the T-R cycle stratigraphy of the Western Shelf is inde- pendent of that on the Eastern Shelf Domain. A synthesis of the T-R cycle stratigraphy of Swan Hills carbonates in the vicinity of the isolated Judy Creek reef complex is presented on the cross-section on Text-figure 5, along a transect from the Archie well southwest through the Forestry well into the Judy Creek reef complex (well 4-35-63-11W5). The T-R cy- cle stratigraphy of Swan Hills carbonates is a summary based on previous investigations of the Judy Creek reef complex (Wendte, 1992, and Wendte and Muir, 1995) as well as aspects from this regional study. The Swan Hills Formation in the vicinity of the Judy Creek reef complex consists of
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