. Bulletins of American paleontology. Devonian Rugose Corals of Iowa: Sorauf 11. 10- feet 15 + Mason ) City -3 meters Member Lithograph City Formation Texi-tigure 2.—Composite stratigraphic section of the Shell Rock Formation as it is exposed along the Shell Rock River, from north of Nora Springs to Rockford, Iowa. Table 1.—Stratigraphic subdivisions of outcropping units of the Shellrock Formation, as slightly modified from Belanski (1927) (Note: Belanski referred to subdivisions of members as zones, re- ferring to what are roughly local range zones of prominent fauna; these are here noted as
. Bulletins of American paleontology. Devonian Rugose Corals of Iowa: Sorauf 11. 10- feet 15 + Mason ) City -3 meters Member Lithograph City Formation Texi-tigure 2.—Composite stratigraphic section of the Shell Rock Formation as it is exposed along the Shell Rock River, from north of Nora Springs to Rockford, Iowa. Table 1.—Stratigraphic subdivisions of outcropping units of the Shellrock Formation, as slightly modified from Belanski (1927) (Note: Belanski referred to subdivisions of members as zones, re- ferring to what are roughly local range zones of prominent fauna; these are here noted as beds. Some of the taxa utilized above may also be invalid.) SHKLI. ROCK FORMATION NORA MEMBER "Second Aclinostroma" beds — upper biostrome Plalyrachella beds — argillaceous, dolomitic "First Aclinostroma" beds — lower biostrome ROCK GROVE MASON CITY Li'pUlocenlris beds Trigonotreta beds Aulopora beds — basal biostrome ber comes from "its great development in Rock Grove township of Floyd County", (Belanski, 1927, p. 328), with a type section along the Shell Rock River, south of Nora Springs, Iowa (for details, see Koch, 1970, p. 12). The Rock Grove Member does not contain coral faunas, although it is fossiliferous, with upper and low- er units recognized by Belanski based on molluscs and brachiopods (1927, p. 328, 330). The only corals re- ported are from the uppermost bed of the member, as exposed on the east side of the Shell Rock River at Rockford, and reported only as "corals" by Belanski (1927. p. 353). This bed was not observed by me, and only one coral specimen in the Belanski collection at the University of Iowa is labeled as coming from Rock. 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
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