. Bulletins of American paleontology. St. Peter-Glenwood Conodonts: Witzke and Metzger 63 SHALE. Text-figure 4.—Proposed stratigraphic correlations of St. Peter through Platteville succession in four core sections, northeast Kansas to eastern Iowa (localities given in Appendix and shown on Text-fig. 2). Relationships dashed where uncertain. Platteville Formation comprises the Pecatonica and McGregor members (thinned and condensed in western Iowa). Carimona Member and Spechts Ferry Shale are included in the lower Decorah Formation; position of the widespread Deicke K-bentonite is shown. Symbols
. Bulletins of American paleontology. St. Peter-Glenwood Conodonts: Witzke and Metzger 63 SHALE. Text-figure 4.—Proposed stratigraphic correlations of St. Peter through Platteville succession in four core sections, northeast Kansas to eastern Iowa (localities given in Appendix and shown on Text-fig. 2). Relationships dashed where uncertain. Platteville Formation comprises the Pecatonica and McGregor members (thinned and condensed in western Iowa). Carimona Member and Spechts Ferry Shale are included in the lower Decorah Formation; position of the widespread Deicke K-bentonite is shown. Symbols as in Text-figure 1. Additional symbols: V (vuggy), c (coarse sand), h (horizontal laminae), c/k (conodonts per kilogram), (x) (echinderm debris), # (bryozoans). and sandstone deposition are displayed in the CQ core (Text-fig. 1; units 3-4, 4-6, 7. 8-10, 11-13). Similar and possibly correlative cyclic units are present throughout the western facies tract (Text-figs. 3, 4). Although information is insufficient to demonstrate unequivocal stratigraphic relationships, some of the condensed shale units in the western facies tract prob- ably correlate to pyritic hardground surfaces within the sandstone-dominated succession of eastern Iowa (hy- pothetical coiTclations shown on Text-fig. 4). We be- lieve such surfaces mark widespread sediment star- vation across the eastern shelf corresponding to epi- sodes of regional transgression and eustatic deepening. Similarly, the deepening-shallowing sandstone cycles. 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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