g82 NEW YORK STATE MUSEUM 



13 James Hall. Study of the graptolites. (20th an. rep't N. Y. state 



cab. nat. hist. 1868. p. 169-240) 



14 Description of new species of Crinoidea and other fossils, etc. 



(24th an. rep't N. Y. state cab. nat. hist. 1870. p. 181-200) 



15 On the geology of the southern counties of New York, etc. 



(Proc. Amer. ass'n adv, sci. 1875. B, p. 80-84) 



16 K. P. Whitfield. In Lieut. G. M. Wheeler's report upon U. S. geogr. 



sur. west of the 100th merid. 1877. v. 4, Pal. p. 19-20 



17 James Hall. Note upon the history and value of the term Hudson 



river group in American geological nomenclature. (Proc. Amer. 

 ass'n adv. sci. 1877. 26:259-65) 



18 N". S. Shaler. On the existence of the Alleghany division of the Ap- 



palachian range within the Hudson valley. (Amer. naturalist. 

 11:627-28) 



19 C. D. Walcott. The Utica slate and related formations of the sama 



geological horizon. (Trans. Albany inst. 10:1-38) 



20 T. N". Bale. On the age of the clay-slates and grits of Poughkeepsle, 



(Amer. jour. sci. 1879. 3d ser. 17:57-59) 



21 J. D. Dana. On the Hudson river age of the Taconic schists and on 



the dependent relations of the Dutchess county and western Con- 

 necticut limestone belts. (Amer. jour. sci. 1879. 17:375) 



22 W. R. Gerard. The Hudson river group at Poughkeepsle. (Amer, 



naturalist. 1879. 13:199) 



23 W. B. Dwight. On the recent explorations in the Wappinger valley 



limestone of Dutchess co. New York. (Amer. jour. sci. 1879. 

 17:389-92) 



24 Calciferous as well as Trenton fossils in the Wappinger lime- 

 stone at Rochdale and a Trenton locality at Newburgh N. Y. (Amer. 

 jour. sci. 1880. 19:50^54) 



25 Arnold Gruyot. On the physical structure and hypsometry of the 



Catskill mountain region. (Amer. jour. sci. 1880. 19:429-51) 



26 C. E. Beecher. List of species of fossils from an exposure of the 



Utica slate and associated rocks within the limits of the city of 

 Albany. (36th an. rep't N. Y. state mus. nat. hist. 1883. p. 78) 



27 H. Booth. Discovery of Utica slate graptolites on the west side of 



the Hudson. (Amer. jour. sci. 1883. 26:380-81) 



28 W. B. Dwight. Recent explorations in the Wappinger valley lime- 



stone of Dutchess CO. N. Y. (Amer. jour. sci. 1884. 27:249-59) 



29 S. W. Ford. Age of the glazed and contorted slaty rocks in the 



vicinity of Schodack Landing, Rensselaer co. N. Y. (Amer. jour. 



sci. 1884. 28:206-9) 

 BO Age of the slaty and arenaceous rocks in the vicinity of 



Schenectady N. Y. (Amer. jour. sci. 1885. 29:397-99) 

 Bl Great fault, Schodack Landing, N. Y. (Amer. jour. sci. 1885. 



29:16-20) 

 82 N. H. Barton. Fossils in the Hudson river slates of the southern 



part of Orange co. N. Y. (Amer. jour. sci. 1885. 30:452-54) 



