624 PROCEEDINGS OF WASHINGTON MEETING. 



141. A spit forming under water, western end of Bois Blanc island, Michigan. 



Mackinaw island in the distance. 



142. Spit of shingle, Au Train island, Lake Superior. PI. XIII. 



143. Curved sand spit, southern channel. Strait of Mackinaw. 



144. A recurved spit, " Duck point," Grand Traverse bay, Lake Michigan. PI. IX. 



145. Bar joining Empire and Sleeping Bear bluffs, eastern shore Lake Michigan. 



PI. yiiL 



146. Ancient sea-cliff of Lake Michigan, near Glen Arbor. Michigan. 



147. Ancient sea-cliff of Lake Michigan, South Manitou island, Lake Michigan. 



PI. VI. 



Lacustrine Deposits^ Sedhneniary. 



148. Sediments of Lake Lahontan, Humboldt valley near Eye Patch, Nevada. Pub- 



lished in Monograph No. XI, U. S. Geol. Survey, pi. XXII. Size, 8 x 10 

 inches. Photographed by I. C. Russell, 1882. 



149. Lahontan lake-beds, bank of Humboldt river, Nevada. Size, 8 x 10 inches. 



Photographed by I. C. Russell, 1882. 



150. Contorted lake-beds near southern margin of Mono lake, California. Published 



in Eighth Ann. Rep. U. S. Geol. Survey, pi. XXIY. Size, 8 x 10 inches. 

 Photographed by I. C. Russell, 1883. 



151. Deposit of infusorial earth 110 feet thick near Great bend of Pitt river, Shasta 



county, California. Size, 8x10 inches. Photographed by J. S. Diller, 1885. 



Lacustrine Dej)osits, Chemical. (Photographed by I. C. Russell, 1883. Size, 8 x 10 



inches.) 



152. Lithoid, thinolitic and dendritic tufa deposited from the waters of Lake Lahon- 



tan, shore of Pyramid lake, Nevada. 



153. Towers of calcareous tufa formed by sub-lacustral springs, shore of Mono lake, 



California. Published in Eighth Ann. Rep. U. S. Geol. Survey, pi. XXY. 



154. Hillside coated with calcareous tufa deposited from Lake Lahontan, shore of 



Pyramid lake, Nevada. 



155. Calcareous tufa deposited from the waters of Lake Lahontan, shore of Pyramid 



lake, Nevada. 



156. Rocks coated with calcareous tufa, beach of oolitic sand. Shore of P3'ramid lake, 



Nevada. Published in Monograph XI, U. S. Geol. Survey, pi. XIII. 



157. Tufa domes formed by sub-lacustral springs. Published in Eighth Ann. Rep. 



U. S. Geol. Survey, pi. XXI. 



158. An island of calcareous tufa deposited from the waters of Lake Lahontan, Pyra- 



mid lake, Nevada. Published in Monograph XI, U. S. Geol. Survey, pi. 

 XXXVIII. 



159. Pyramid island. Pyramid lake, Nevada; an island coated with calcareous tufa. 



Published in Monograph XI, U. S. Geol. Survey, pi. XI. 



Spring Deposits. 



160. Upper geyser basin, Yellowstone National Park. Crater of Old Faithful in the 



foreground at the right. In the distance the Castle and Grand geysers are in 

 eruption. The formation is silicious sinter. Size, 10x13 inches. Photo- 

 graphed by W. H. Jackson. 



161. Crater of the Castle geyser, Upper geyser basin, Yellowstone National Park. 



Silicious sinter. Size, 10 x 13 inches. Photographed by W. H. Jackson. 



162. Crater of the Grotto geyser. Silicious sinter. Yellowstone National Park. 



Size, 10 X 13 inches. Photographed by W. H. Jackson. 



