ANCIENT WATER LEVELS OF CHAMPLAIN-HUDSON VALLEYS 249 



63 Gordon, R. Bones of a Mastodon Found. Science, n. s. 1902. 16:594. 



Q4. _ Tree Trunks Found with Mastodon Remains. Science, n. s. 



1902. 16:103S. 



65 Grabau, A. W. Guide to the Geology and Paleontology of Niagara Falls 



and Vicinity. N. Y. State Mus. Bui. 45. 1901. Bibliography. 



66 Grant, W. H. Lenticular Concretions from North of Stuyvesant Land- 



ing, Columbia County, N. Y. N. Y. State Cab. Nat. Hist. 4th An. 

 Rep't. 1851. p.77-79. 



67 Gratacap, L. P. Opinions upon Clay Stones and Concretions. Am. 



Nat. 1884. 18:882-92, pi. 26-27. 



68 Bowlder of Oriskany on Staten Island. Staten Island Nat. 



Hist. Ass'n. Proc. Mar. 1889, Am. Nat. 1889. 23:549-50. 



69 Potsdam Sandstone from Drift on Shore at Tottenville, Staten 



Island. Am. Nat. 1890. 24:695; Science. 1890. 15:14. 



70 Green, J. Minenalized Tree, Rocking Stone, etc. Am. Jour. Sci. 1822. 



5 : 251-54. 



71 Hall, C. E. Contorted Clays on the West Side of Lake Champlain. 



Geol. Sur. Pa. 2d Rep't. C5. 1885. pt 1. 



72 Hall, James. Deposit at Clyde, N. Y. holding Cranium of Casteroides 



ohioensis. Bo-st. Soc. Nat. Llist. Proc. 1848. 2:167-08. 



73 — • Geology of Lake Champlain Region. Albany Inst. Proc. 1878. 



2:247-50. 



74 Hayden, H. H. Geological Essays. Baltimore. 1820. (p.35, 52, 179-80.) 



75 Hitchcock, C. H. On the Marks of Ancient Glaciers on the Green 



Mountain Range in Massachusetts and Vermont. Am. Ass'n Proc. 

 1860. 13:329-35. 



76 ■ — Distribution of Maritime Plants in North America a Proof of 



Oceanic Submergence in the Champlain Period (abstract). Am. 

 Ass'n Proc. 1871. 19:175-82. 



77 Existence of Glacial Action upon the Summit of Mt Washing- 

 ton, N. PI. Am. Ass'n Proc. 1875. v.24, pt 2, p.92-96. 



78 • Glacial Period in Eastern America. Geol. Mag. 1879. 



6:248^50. 



79 Glacial Drift. Geol. N. H. 1878. v.3, pt 3, p. 177-284, 309-29, 



333-38. 



SO Glacial Markings among the White Mountains. Appalachia. 



1879. 1:243-46. 



-81 Glacial Flood of the Connecticut Valley (abstract). Am. 



Ass'n Proc. 1883. 31:325-29. 



S2 Subsidence in Later Glacial Times in the Northern New Eng- 

 land St Lawrence Region. Am, Geol. 1891. 8:235. 



83 Eastern Lobe of the lee-sheet. Am. Geol. 1897. 20:27-33. 



84 Hitchcock, Edward. Final Report on the Geology of Miassachusetts. 



1841. 



85 Illustrations of Surface Geology. Washington. 1856. 



^6 & Hagar, A. D. Report on the Geology of Vermont. 1861. 2v. 



87 Hollick, A. Some Features of the Staten Island Drift. Geol. Soc. Am. 



Bui. 1899. 10:2-4. 



88 Hubbard, 0. P. Pot-holes Opposite Catskill. N. Y. Acad. Sci. Trans. 



1890. 9:3. 



