42 ANNALS NEW YORK ACADEMY OF SCIENCES 



*117. Clark, W. B., and Mathews, E. B. 1906. Physical features of Maryland. 



Md. Geol. Surv., Spec. Pub., VI (with geol. map). 

 *118. Davis, W. M. 1884. The little mountains east of the Catskills. Appal- 



achia, III, p. 20; also Bull. Mus. Comp. Zool., VII, p. 310. 

 *119. Davis, W. M. 1889. Rivers and valleys of Pennsylvania. Nat. Geog. 



Mag., I, p. 183 (also in essays). 

 *120. Lesley, J. P. 1856. Manual of coal and its topography. 

 121. Stoek, H. H. 1901. Pennsylvania anthracite coal field. 22nd Ann. Kept. 



U. S. G. S., Part 3, p. 55. 

 *122. Tower, W. S. 1905. Topography and travel in Pennsylvania. Bull. Am. 



Geog. Soc, XXXVII, p. 145. 

 123. Williams, E. H. 1894. Extramorainic drift between the Delaware and 



Schuylkill. Bull. Geol. Soc. Am., V, p. 281. 

 *124. Willis, B. 1895. Northern Appalachians. Nat. Geog. Soc, Monographs, 



p. 169. 

 *125. Willis, B. 1892. Mechanics of Appalachian structure. 13th Ann. Kept. 



U. S. G. S., Part 2, p. 211. 



126. Willis, B. 1907. Potomac river basin. Wat. Sup. Pap. U. S. G. S., No. 



192. 



127. . 1906. Luray caverns. Nat. Geog. Mag., XVII, p. 358. 



128. Harpers Ferry Folio, U. S. G. S., No. 10. 



129. Staunton Folio, U. S. G. S., No. 14. 



130. Piedmont Folio, U. S. G. S., No. 28. 



131. Franklin Furnace Folio, U. S. G. S., No. 161. 



132. W'aynesburg-Chambersburg Folio, U. S. G. S., No. 170. 



133. Papaw-Hancock Folio, U. S. G. S., No. 179. 



VI. — Triassic Lowland 



134. Darton, N. H. 1890. Traps of Newark system in New Jersey. Bull. 



U. S. G. S., No. 67. 



135. Davis, W. M. 1880. Triassic sandstones. Bull. Mus. Comp. Zool., VII, 



p. 249. 

 *136. Davis, W. M. 1890. Geographic development of northern New Jersey. 



Proc. Boston Soc. Nat. Hist., XXIV, p. 365. 

 *137. Davis, W. M. 1890. Rivers of northern New Jersey. Nat. Geog. Mag., 



II, p. 81 (also in essays). 



*138. Davis, W. M. 1891. Dates of origin of topographic forms on Atlantic 

 slope. Bull. Geol. Soc. Am., II, p. 545. 



139. Hobbs, W. H. 1902. Former extent of Newark system. Bull. Geol. Soc. 



Am., XIII, p. 139. 



140. Keith, A. 1893: Catoctin belt. 14th Ann. Rept. U. S. G. S., p. 285. 



141. Klimmel, H. B. 1897. Newark system of New Jersey. Jour. Geol., V, 



p. 541. 



142. Kiimmel, H. B. 1899. Newark system of New Jersey and New York. 



Jour. Geol., VII, p. 23. 



143. Lewis, J. V. 1907. Newark trap. Bull. Geol. Soc. Am., XVIII, p. 195. 

 *144. Salisbury, R. D., and Kiimmel, H. B. 1895. Lake Passaic. Jour. Geol., 



III, p. 353. 



*145. New York Folio, U. S. G. S., No. 83. 

 *146. Passaic Folio, U. S. G. S., No. 157. 



