By Walter E. and Michael A. Arthur (Eds) Dean

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Additional info for Stratigraphy and paleoenvironments of the Cretaceous Western Interior Seaway, USA (Concepts in Sedimentology & Paleontology 6)

Example text

W Greenhorn Formation e E C-) -0. : m Z-.. HL 3 <---- CC 0 HL 2 HL 1 tv 1000 MK - zce zw - - In the Kansas outcrops, the Greenhorn Formation is an i.. interbedded succession of dark-colored, shaly chalk, chalky limestone, calcarenite, and calcareous shale 21 to 41 m (69 to 134 ft) C thick (Table 2). 8 ft) (Table 2). ) C. Zi" "X" Bentonite 1050 FIG. -Gamma-ray (left) and resistivity logs (right) of the Bounds well showing depositional cycles in the Greenhorn Formation marked off by thin horizontal lines.

1993). Mytiloides hercynicus? 2 ft in the Fairport represents a range zone in the lower Middle Turonian. 8 ft in the Fairport, with the preceding species, characterize the Middle Turonian. 0 ft at the top of the Fairport Chalk Member of the Carlile Shale. 45 Ma) is represented in the Blue Hill Shale Member of the Carlile. The occurrence of Mytiloides costellatus? 8 ft at the top of the Fairport in this core is lower than reported by Kauffman et al. (1993); they found it in the Blue Hill and the Codell Members of the Carlile.

Fossil tops indicated by + and fossil base by o. Only the key fossils are named on this graph, although bases and tops of other taxa constraining the line of correlation are shown. The xaxis is age in the Amoco composite standard at a variable scale. The solid line is the FIG. 5 4 -1- _1 8 650 + G. schneegansi G. subconicus V. plummerae \&ronifera G. primitiva 700' G. umbilicata L. kansasensis 4 preferred line of correlation; the dashed line is the alternative if cycles are at a 100 ka frequency.

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