. Bulletins of American paleontology. 10 Bulletin 355. Text-figure \.—Index map of outcrop area of Frasnian strata in north-central Iowa, as well as symbols for strata exposed at each locality. Further information regarding the locations and strata at each locality is to be found on following text-figures and in the Appendix. Springs and Rockford. It has yielded abundant solitary corals (Tabiilophyllum), and colonial phillipsastreidru- gosans at Cooper's Bend, at Tom Williams Quarry (Locality 16, Text-figs. 4,6), and as far south as the Maxson Quarry at Marble Rock, Iowa (Locality 24, Text-fig
. Bulletins of American paleontology. 10 Bulletin 355. Text-figure \.—Index map of outcrop area of Frasnian strata in north-central Iowa, as well as symbols for strata exposed at each locality. Further information regarding the locations and strata at each locality is to be found on following text-figures and in the Appendix. Springs and Rockford. It has yielded abundant solitary corals (Tabiilophyllum), and colonial phillipsastreidru- gosans at Cooper's Bend, at Tom Williams Quarry (Locality 16, Text-figs. 4,6), and as far south as the Maxson Quarry at Marble Rock, Iowa (Locality 24, Text-fig. 9). Rock Grove Member The Rock Grove Member consists of yellow-weath- ering dolomitic shale and argillaceous dolomite. The unit commonly forms a somewhat recessive slope with generally poor outcrops. The name Rock Grove Mem-. 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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