VI ADVERTISEMENT. 
106. The Colorado Formation and its Invertebrate Fauna, by T. W. Stanton. 1893. 8°. 288 pp. 
45 pi. Price 20 cents. 
107. The Trap Dikes of the Lake Champlain Region, by James Furman Kemp and Vernon Free- 
man Marsters. 1893. 8°. 62 pp. 4 pi. Price 10 cents. 
108. A Geological Keconnoissance in Central "Washington, by Israel Cook Eussell. 1893. 8°. 108 pp. 
12 pi. Price 15 cents. 
109. The Eruptive and Sedimentary Rocks on Pigeon Point, .Minnesota, and their Contact Phenom- 
ena, by William Shirley Bayley. 1893. 8°. 121 pp. 16 pi. Price 15 cents. 
110. The Paleozoic Section in the Vicinity of Three Forks, Montana, by Albert Charles Peale. 1893. 
8°. 56 pp. 6 pi. Price 10 cents. 
111. Geology of the Big Stone Gap Coal Field of Virginia ami Kentucky, by Marius P. Campbell, 
1893. 8°. 106 pp. 6 pi. Price 15 cents. 
112. Earthquakes in California in 1892, by Charles D. Perrine. 1893. 8°. 57 pp. Price 10 cents. 
113. A Report of Work done in the Division of Chemistry during the Fiscal Years 1891-'92 and 
1892-'93. F. W. Clarke, Chief Chemist. 1893. 8°. 115 pp. Price 15 cents. 
114. Earthquakes in California in 1893, by Charles D. Perrine. 1894. 8°. 23 pp. Price 5 cents. 
115. A Geographic Dictionary of Rhode Island, by Henry Gannett. 1894. 8°. 31 pp. Price 5 cents. 
116. A Geographic Dictionary of Massachusetts, by Henry Gannett. 1894. 8°. 126 pp. Price 15 
cents. 
117. A Geographic Dictionary of Connecticut, by Henry Gannett. 1894. 8°. 67 pp. Price 10 cents. 
118. A Geographic Dictionary of New Jersey, by Henry Gannett. 1894. 8°. 131 pp. Price 15 cents. 
119. A Geological Reconnoissance in Northwest Wyoming, by George Homans Eldridge. 1894. 8°. 
72 pp. 4 pi. Price 10 cents. 
120. The DeA-onian System of Eastern Pennsylvania and New York, by Charles S. Prosser. 1894. 
8°. 81 pp. 2 pi. Price 10 cents. 
121. A Bibliography of North American Paleontology, by Charles Rollin Keyes. 1894. 8°. 251 pp. 
Price 20 cents. 
122. Results of Primary Triangulation, by Henry Gannett. 1894. 8°. 412pp. 17 pi. Price25cents. 
123. A Dictionary of Geographic Positions, by Henry Gannett. 1895. 8°. 183 pp. 1 pi. Price 15 
cents. 
124. Revision of North American Fossil Cockroaches, by Samuel Hubbard Scudder. 1895. 8°. 176 
pp. 12 pi. Price 15 cents. 
125. The Constitution of the Silicates, by Frank Wigglesworth Clarke. 1895. 8°. 109 pp. Price 15 
cents. 
126. A Mineralogical Lexicon of Franklin, Hampshire, and Hampden Counties, Massachusetts, by 
Benjamin Kendall Emerson. 1895. 8°. 180 pp. 1 pi. Price 15 cents. 
127. Catalogue and Index of Contributions to North American Geology, 1732-1891, by Nelson 
Horatio Darton. 1896. 8°. 1045 pp. Price 60 cents. 
128. The Bear River Formation and its Characteristic Fauna, by Charles A. White. 1895. 8°. 108 
pp. 11 pi. Price 15 cents. 
129. Earthquakes in California in 1894, by Charles D. Perrine. 1895. 8°. 25 pp. Price 5 cents. 
130. Bibliography and Index of North American Geology. Paleontology, Petrology, and Mineralogy 
for 1892 and 1893, by Fred Boughton Weeks. 1896. 8°. 210 pp. Trice 20 cents. 
131. Report of Progress of the Division of Hydrography for the Calendar Years 1893 and 1894, by 
Frederick Haynes Newell, Topographer in Charge. 1895. 8°. 126 pp. Price 15 cents. 
132. The Disseminated Lead Ores of Southeastern Missouri, by Arthur Winslow. 1896. 8°. 31 pp 
Price 5 cents. 
133. Contributions to the Cretaceous Paleontology of the Pacific Coast : The Fauna of the Knoxville 
Beds, by T. W. Stanton. 1895. 8°. 132 pp. 20 pi. Price 15 cents. 
134. The Cambrian Rocks of Pennsylvania, by Charles Doolittle Walcott. 1896. 8°. 43 pp. 15 pi. 
Price 5 cents. 
135. Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 
for the Year 1894, by F. B. Weeks. 1896. 8°. 141 pp. Price 15 cents. 
136. Volcanic Rocks of South Mountain, Pennsylvania, by Florence Bascom. 1896. 8°. 124 pp. 28 
pi. Price 15 cents. 
140. Report of Progress of the Division of Hydrography for the Calendar Year 1895, by Frederick 
Haynes Newell, Hydrographer in Charge. 1896. 8°. 356 pp. Price 25 cents. 
In press : 
137. Geology of the Fort Riley Military Reservation, Kansas, by Robert Hay. 
138. Artesian-well Prospects in the Atlantic Coastal Plain Region, by N. II. Darton. 
139. Geology of the Castle Mountain Mining District, Montana, by W. H. Weed and L. V. Pirsson. 
141. The Eocene Deposits of the Middle xVtlantic Slope in Delaware, Maryland, and Virginia, by Wil- 
liam Bullock Clark. 
142. A Brief Contribution to the Geology and Paleontology of Northwestern Louisiana, by T. Way- 
land Vaughan. 
