436 REPORT OF NATIONAL MUSEUM, 1899. 



bituminous compounds in the United States. For full and detailed 

 information relative to the petroleum industry of the world the reader 

 is referred to the works mentioned in the Bibliography, that of Bover- 

 ton Kedwood being the most systematic and complete. 



The petroleum series in the Museum collections is quite large (some 

 303 samples), and is arranged for exhibition so as to illustrate (1) varia- 

 tion in specific gravity, (2) in color, (3) geological distribution, (4) depth 

 of source, (5) geographical distribution. This last, nearly as it stands 

 to-day, was described in Mr. Dewey's Handbook, Collections in Econo- 

 mic Geology, 1 and the list is not entirely reprinted here. 



In this connection reference should be made to the series of sands 

 and rocks associated with petroleums and bituminous deposits in a sep- 

 arate case. This comprises oil-bearing sands from wells in Wash- 

 ington County, Pennsylvania (Specimens Nos. 52025, 62997, 59930, 

 59932, U.S.N.M.); Oil City, Venango County, Pennsylvania (Specimen 

 No. 62998, U.S.N.M.); Butler County, Pennsylvania (Specimen No. 

 62996, U.S.N.M.), and a block of sandstone weighing 8 pounds, blown 

 from well No. 9, on Barse tract, McKean County, Pennsylvania, at 

 a depth of 1,730 feet. Also oil sands from Marion County, West Vir- 

 ginia (Specimens Nos. 62790, 62994, 62995, U.S.N.M.); oil-bearing 

 shales from Ventura County, California (Specimens Nos. 62785, 62914, 

 62915, U.S.N.M.); oil-bearing shales from Santa Barbara County, 

 California (Specimens Nos. 62939-62943, U.S.N.M.); core of diamond 

 drill from well No. 19, Pico oil field, California (Specimen No. 62921, 

 U.S.N.M.); bituminous dolomite from Cook County, Illinois (Specimen 

 No. 62789, U.S.N.M.); geodes of quartz filled with bitumen from 

 Hancock County, Illinois (Specimen No. 40364, U.S.N.M.); asphaltic 

 sands from Wyoming (Specimen No. 62716, U.S.N.M.); Indian Terri- 

 tory (Specimen No. 62245, U.S.N.M.); Germany (Specimen No. 66855, 

 U.S.N.M.); a series of sands, sandstones, and shales, with varieties 

 of asphalt, from the island of Trinidad (Specimens Nos. 68050-68066, 

 U.S.N.M.); trappean rock with bitumen, Hartford County, Connecti- 

 cut (Specimen No. 59934, U.S.N.M.); andesite with bitumen, Lake 

 Tahoe, Nevada (Specimen No. 33884, U.S.N.M.); shale associated with 

 albertite, Albert County, New Brunswick (Specimens Nos. 59936, 

 59938, 59939, U.S.N.M.); and clays associated with ozokerite and salt, 

 Boryslaw, Galicia (Specimens Nos. 66087, 66088, U.S.N.M.). 



1. EXHIBIT ILLUSTRATING VARIATION IN SPECIFIC GRAVITY. 



The series is arranged to show gradually decreasing specific gravity. 

 It begins with a very dark oil of 22 Baume= 0.9210 specific gravity. 

 In general as the specific gravity decreases the color grows lighter. 

 To this, however, there are several notable exceptions. For instance, 

 No. 59736 (32i Baume= 0.8614 specific gravity) is much lighter in 



Bulletin No. 42 of the U. S. National Museum, 1891. 



