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(42) Prosser, C. S. Sections of the Formations along the Northern 



End of the Helderberg Plateau. N. Y. State Geol. Rep't 18 

 (for 1898), p. 51- 



(43) Jaekel, Otto. Stamraesgeschichte der Pelmatozoen. v. i. 



(44) 1900 Cumings, E. R. Lower Silurian System of Eastern Mont* 



gomery County, N. Y. N. Y.' State Mus. Bui. 34, p. 415. 



(45) 1900 Prosser, C. S. Notes on Stratigraphy of Mohawk Valley and 



Saratoga County. N. Y. State Mus. Bui. 34, p. 469. 



(46) 1901 Bather, F. A. The Geologic Distribution of Pollicipes and 



Scalpellum. Science, n. s. 14:112. 



(47) Ruedemann, Rudolf. Hudson River Beds near Albany and 



Their Taxonomic Equivalents. N. Y. State Mus. Bui. 42. 



(48) Ruedemann, R. Trenton Conglomerate of Rysedorph Hill and 



Its Fauna. N. Y. State Mus. Bui. 49, p. 3. 



(49) 1902 Nickles, J. M. The Geology of Cincinnati. Jour. Cine. Soc. 



of Natural History. 20:49. 



(50) Pocta, Phil. Ueber die Anfangskammer der Gattung 



Orthoceras Breyn. Sitzungsber. der K. bohm. Gesellsch. 

 d. Wiss. 



(51) Ulrich, E. O., & Schuchert, Charles. Palaeozoic Seas and 



Barriers in Eastern North America. N. Y, State Mus. 

 Bui. 52, p. 633. 



(52) 1903 Clarke, J. M. Classification of New York Series of Geologic 



Formations. N. Y. State Mus. Handbook 19. 



(53) Weller, Stuart. The Paleozoic Faunas of New Jersey, 



Geol. Surv. of New Jersey, Rep't on Pal., v. 3. \ 



(54) 1905 Cushing, H. P. Geology of the Northern Adirondack 



Region. N. Y. State Mus. Bui. 95. 



(55) Cushing, H. P. Geology of the Vicinity of Little Falls, 



Herkimer County. N. Y. State Mus. Bui. "j^, 



(56) 1906 Grabau, A. W. Geology and Paleontology of the Schoharie 



Valley. N. Y. State Mus. Bui. 92. 



(57) 1908 Cumings, E. R. The Stratigraphy and Paleontology of the 



Ordovician Rocks of Indiana. 32d Annual Rep't of the 

 Dep't of Geology of Indiana. 



(58) Elles, G. L., & Wood, E. M. R. Monograph of British 



Graptolites ; ed. by C. Lapworth. Pt VI. Pal. Soc. for 

 1907; pt VII, 1908. 



(59) Kiimmel, H. B. Paleozoic Sedimentary Rocks in Franklin 



Furnace Folio, N. J.; U. S. G. S., Folio 161. 



(60) Ruedemann, Rudolf. Graptolites of New York, pt 2. N. Y. 



State Mus. Mem. 11. 



(61) 1909 Stose, George W. Mercersburg-Chambersburg Folio, Pa. ; 



U. S. G. S. Folio 170. 



(62) Bassler, Ray S. The Cement Resources of Virginia West of 



the Blue Ridge. Virg. Geol. Surv. Bui. 2. 



(63) Foerste, Aug. F. Preliminary Notes on Cincinnatian and 



Lexington Fossils. Bui. Denison Univ. 14:289. 



