7 2 NEW YORK STATE MUSEUM 



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

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(43) Jaekel, Otto. Stammesgeschichte der Pelmatozoen. v. I. 



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



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(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. 

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



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(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 Gushing, H. P. Geology of the Northern Adirondack 



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



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



Herkimer County. N. Y. State Mus. Bui. 77. 



(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 

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



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

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



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



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(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 



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