 | Iowa Geological Survey - 1900 - 742 σελίδες
...generalized summary of the Niagara section may be deduced: TEBT. 7. Upper quarry beds 20 6. Cerionites beds 25 5. Pentamerus beds 50 4. Syringopora beds...2. Lower quarry beds 20 1. Basal beds . . 15 Total thickness of the Niagara limestone in Dubuque county 220 SUPERFICIAL MATERIALS. In Dubuque county,... | |
 | 1900 - 714 σελίδες
...deduced: 7. Upper quarry beds 20 6. Cerionites beds 25 5. Pentamerus beds 50 4. Syringopora beds 05 3. Chert beds 25 2. Lower quarry beds 20 1. Basal beds 15 Total thickness of the Niagara limestone in Dubuque county 220 SUPERFICIAL MATERIALS. In Dubuque county,... | |
 | Geological Survey (U.S.) - 1905 - 82 σελίδες
...beds .._.'... - - 25 5. Pentamerus beds 50 4. Syringopora beds . . - . 65 3. Chert-bearing beds _ - - 25 2. Lower quarry beds 20 1 . Basal beds 15 Total - 220 «Foster and Whitney, Geology Lake Superior Land District, 1851, pt. 2, pp. 148-151. bFor summary and... | |
 | Harry Foster Bain - 1906 - 778 σελίδες
.................................................................................. B5 :<. Chert-boa ring beds ...................................................................................................................................... 220 In general the Niagara dolomite is lighter colored, fine textured, and freer from small, irregular... | |
 | 1907 - 656 σελίδες
...be recognized and he assigns their thickness as follows: FBKT. 7. Upper quarry beds 20 6. Cerionites beds ' 25 5. Pentamerus beds 50 4 . Syringopora beds...burning. It is used extensively in Jackson county. The Gower includes two fairly distinct sub-stages, the LeClaire and the Anamosa. The latter consists... | |
 | 1914 - 168 σελίδες
...section of the Niagara formation in Dubuque County, Iowa"" Feet 1. Upper quarry beds 20 6. Cerionites beds 25 5. Pentamerus beds 50 4. Syringopora beds...Chert beds 25 2. Lower quarry beds 20 1. Basal beds 15 220 The weathered outcrops of the Niagara and Galena formations are in many respects rather similar... | |
| |
FBKT. 7. Upper quarry beds 20 6. Cerionites beds ' 25 5. Pentamerus beds 50 4 . Syringopora beds 65 3. 