SPRING DEPOSITS 471 



1283, 1335, 1342, 1343. Mammoth hot springs, Yellowstone park. 



1349. Cleopatra and Jupiter terraces, Mammoth hot springs, Yellowstone park. 



1351. Pulpit terraces, Mammoth hot springs, Yellowstone park. 



Tepee Buttes 



413. Group north of Nepesta, Pueblo county, Colorado. 



414. Two miles northeast of Boone, Colorado. 



415. Exposed core of a Tepee butte north of Nepesta, Pueblo county, Colorado. 

 1279. Typical butte, due to limestone lense in shale, Weston county, Wyoming. 



Tufaceous Lake-beds 

 704, 707, 709, 711. Lake Lahontan, Nevada. 



Unconformities 



(Near views only) 



239. Lava-capped river-bed, near Delta, California. 



294. Neocene gravels on Iowan sandstone, Amador county, California. 



347. Gneiss and Trenton limestone, near Montmorenci falls, Canada. 



409. Silurian sandstone on gneiss, etc., near Canyon City, Colorado. 



450, 451. Triassic conglomerate on crystalline schist, near Southington, Connecticut. 



505. Drift on limestone, Chicago drainage canal, Illinois. 



542. Drift on Leclaire limestone, Scott county, Iowa. 



552. Niagara on Hudson, Lyons, Iowa. 



593, 594, 603. Columbia formation on crystalline rocks, Washington, D. C. 



595. Lafayette formation on Chesapeake sands, Washington, D. C. 



596. Chesapeake, Matawan, and Potomac formation, District of Columbia. 

 605-608. Columbia formation on Potomac formation, head of Chesapeake bay, 



Maryland. 



611. Columbia and Potomac formations, Baltimore, Maryland. 



612. Formation of gravel from vein quartz, Washington, D. C. 

 803. Calciferous sandrock on gneiss, Little falls, New York. 



825. Potsdam sandstone on crystalline rock, Jessups landing, Saratoga county, 



New York. 



826. Potsdam conglomerate on crystalline rock near Mosherville, New York. 

 830. Calciferous sand rock on crystalline schist, near Downing station, New York. 

 846. Champlain clay against Helderberg near Rondout, New York. 



1067. Titanotherium beds on Pierre shales, Washington county, South Dakota. 

 1105. Jurassic sandstone on Red beds, south of Hot Springs, South Dakota. 

 1111. Cambrian sandstone on crystalline schist, Deadwood, South Dakota. 

 1136. Volcanic ash and chalk, Kountz series, Texas. 

 1148. Carboniferous and Permian, Hurricane cliff, south of Toquerville, Utah. 



Veins 



126. Quartz gash veining in blue quartz schist bed rock on Tasnuna river, Alaska. 

 393. Granite cut by veins of quartz, feldspar, and biotite, coarse, in canyon of 

 Animas river, Colorado. 



