OREGON 425 



942. Rose's black sand mine. The bedrock in the foreground of Eocene shales 



and highly tilted. Upon this rests the black sand, which is overlaid by a 

 considerable thickness of sands and clays (No. 364). 



Pennsylvania (Including Northern Delaware) 



Photographed by E. B. Harden for the Geological Survey of Pennsylvania 



Negatives in photograph gallery of United States Geological Survey. They bear 

 Harden's negative numbers, by which they should be ordered 



943. Gilmore's slide tipple. Keport K 4, Second Geological Survey of Pennsyl- 



vania, plate iii (No. 1586). 



944. Caledonia tipple. Report K 4, Second Geological Survey of Pennsylvania, 



plate i (No. 1588). 



945. Venetia Mine tipple, Peters creek. Report K 4, Second Geological Survey 



of Pennsylvania, plate xi (No. 1590). 



946. Little Saw-mill Run Railroad Company's tipple, South Pittsburg. Keport 



K 4, Second Geological Survey of Pennsylvania, plate x (No. 1591). 



947. Amity Mine tipple. Report K 4, Second Geological Survey of Pennsylvania, 



plate ix (No: 1592). 



948. Relief map of the rocky ridge and east broad top coal basins, in Huntington 



county, Pennsylvania. By Edward B. Harden (No. 1596). 



949. Relief map of Bald Eagle mountain and Nittany valley. By Edward B. 



Harden (No. 1597). ♦ 



950. Model of the Cornwall iron ore mines, looking north. Annual Report of 



Geological Survey of Pennsylvania, 1885 (No. 1598). 



951. Compressed air locomotive, Old Eagle mine. Report K4, Second Geological 



Survey of Pennsylvania, plate v (No. 1599). 



952. Deshong's quarry, near Chester, Pennsylvania (No. 1601). 



953. Ward's quarry, near Chester, Pennsylvania (No. 1602). 



954. Ohlinger Dam quarry, showing both dip and cleavage in Laurentian gneiss, 



3 miles northeast of Reading, Pennsylvania. Report D 3, volume 2, Sec- 

 ond Geological Survey of Pennsylvania (No. 1604). 



955. Leiper quarry, Delaware county, Pennsylvania (No. 1605). 



956. Leiper quarry, Delaware county, Pennsylvania (No. 1607). 



957. Old Quarry No. 2, at Slatington, Lehigh county, Pennsylvania, looking west. 



Report D 3, volume 1, Second Geological Survey of Pennsylvania, 1882, 

 plate 1 (No. 1609). 



958. American slate quarry No. 1, Slatington, Pennsylvania, looking southwest. 



Report D 3, volume 1, Second Geological Survey of Pennsylvania, 1883, 

 plate 2 (No. 1610). 

 9.59. Trap on the south side of the Cornwall big hill, where the spiral railroad 

 enters the upper workings. Annual Report of Geological Survey of Penn- 

 sylvania, 1885 (No. 1612). 



960. Feldspar quarry, Brandywiue Summit kaolin works, Delaware county; 



looking northeast, plate xxiii (No. 1613). 



961. American kaolin works, New Garden township, Chester county; looking 



north. Report C 5, Second Geological Survey of Pennsylvania, plate, 

 xxvii (No. 1614). 



