338 H. F. CLELAND NORTH AMERICAN NATURAL BRIDGES 



spans Bear Creek, south of Sun City, the height of which is 47 feet in 

 the highest place and the width of the span 35 feet. The origin is not 

 clear from the description. 



Kentucky. — Sandstone bridges in Powell and Wolfe counties. 



Massachusetts. — The Korth Adams marble bridge. 



Missouri. — Limestone bridges in Miller and Green counties. 



ISTew York. — Bridges in Jefferson County composed of Black Eiver 

 limestone. 



Oklahoma. — "Natural arch" of limestone, 15 miles southeast of Mc- 

 Alester. Bridges in the Gypsum Hills, in western Oklahoma. 



South Dakota. — ( 1 ) The sandstone bridge near Buffalo Gap. 



(2) A clay bridge spanning Porcupine Creek. 



(3) The Big Bad Lands sandstone bridge. 

 Tennessee. — The sandstone bridge on Lookout Mountain. 

 Utah. — The four great sandstone bridges of San Juan County. 

 Virginia. — The great limestone bridge across Cedar Creek. 

 Vermont. — The schist bridge across the Lamoille Eiver and one other. 

 Wyoming. — (1) The sandstone bridge spanning Le Perle Creek, in 



Converse County. 



(2) The lava bridge in Yellowstone National Park. 



(3) A bridge across Eio Piedra, Wyoming (?). 



