NEBRASKA 413 



695. Titanotherium sands east of Adelia (No. 434). 



696. Dakota sandstone with cross-subbed ding. Bennett, Nebraska (No. 254). 



697. Jail and court-house, Cheyenne county, Nebraska. Arikaree and Gering 



formations unconformable on Brule clay. Looking northwest (No. 310). 



698. The jail, Cheyenne county, Nebraska. Gering formation unconformable on 



Brule claj r . Looking east (No. 311). 



699. ''Chimney rock," Cheyenne county, Nebraska. The spire is of Gering sand- 



stone. The slopes are of Brule clay, containing a bed of volcanic ash. 

 Position of the volcanic ash indicated by horse. Looking west (No. 315). 



700. Gering formation eroded by wind-blown sand 3 miles northeast from Free- 



port, Banner county, Nebraska (No. 327). 



701. " Smokestack," Banner county, Nebraska. From the east. The smokestack 



is of Arikaree conglomerate, of which other fragments are to be seen far- 

 ther back on same ridge. The base of the ridge is of Brule clay (No. 339). 



702. ''Smokestack." From the west. The smokestack is of Arikaree conglom- 



erate, a fragment of an old river channel of Arikaree times (No. 341). 



703. "Twin Sisters," Banner county, Nebraska. Shows Arikaree and Gering for- 



mations lying unconformably on Brule clay; also volcanic ash-bed in 

 lower gap. Looking west (No. 342). 



Nevada 



Photographed by I. C. Russell 

 8 by 10 inches. Negatives in LT n ited States Geological Survey 



704. Lahontan lake-beds, bank of Humboldt river, Nevada (No. 6). 



705. Hillside coated with calcareous tufa deposited from lake Lahontan, shore of 



Pyramid lake, Nevada (No. 11). 



706. Calcareous tufa deposited from the waters of lake Lahontan, shore of 



Pyramid lake (No. 179). 



707. Kocks coated with calcareous tufa, beach of oolitic sand. Shore of Pyramid 



lake. Published in Monograph xi, U. S. Geological Survey, plate xiii 

 (No. 20). 



708. Tufa domes formed by sublacustral springs. Published in Eighth Annual 



Report U. S. Geological Survey, plate xxi (No. 40). 



709. An island of calcareous tufa deposited from the waters of lake Lahontan, 



Pyramid lake. Published in Monograph xi, TJ. S. Geological Survey, plate 

 xxxviii (No. 21). 



710. Sediments of lake Lahontan, Humboldt valley near Rye Patch, Nevada. 



Published in Monograph No. xi, U. S. Geological Survey, plate xxii. 

 Size, 8 by 10 inches (No. 9). 



711. Lithoid, thinolitic, and dendritic tufa deposited from the waters of lake 



Lahontan, shore of Pyramid lake (No. 13). 



Photographed by H. W. Turner 

 6§ by 8J inches. Negatives in United States Geological Survey 



712. Monoclinal ridge capped by basalt at north end of Clayton valley (No. 68). 



713. A single cone of rhyolite-tuff from the same locality as number 714, in the 



foothills of the Palmetto mountains (No. 77). 

 LX— Bult.. Geol. Soc. Am., Vol. 13. 1901 



