TIIK NONMKIALLIC MINKKALS. 439 



•J. KXHIUIT ILLlSTltA'I'INC \A1;IAT!()N I\ COLOR. 



The series iiitiy he divided into two portions, heg-innino- with a thor- 

 oughly ])lack specimen and folU)wiiig- through increasing amounts of 

 green :ind ved to a light greenish yellow in the first portion, and in 

 the second beginning with a dark red and following through to a light 

 straw, in which the greenish element of the color does not appear: 



(1) Black. I'.carOoek, Burkesvillo, ('uiiil)erlan(l County, Kentucky. (59832.) 



(2) Black, tinged with ^^vetm. Mecca, Trumbull County, Ohio. (59757.) 



(3) Dark greenish. Anchor well No. 3, Glade, Warren County, Pennsylvania. 

 (59761.) 



(4) Dark greenish n>d. Dale P>rothers' well No. 1, Batten farm, near Rockland, 

 Venango County, Pennsylvania. (597t)7. ) 



(5) Dark greenish red. Kane, Armstrong County, Pennsylvania. (59752.) 



(6) Light greenish red. <>ordon well, Washington, Washington County, Penn- 

 sylvania. (59526.) 



(7) Greenish yellow. Leedecker well, Butler County, Pennsylvania. (59750.) 



(8) Dark red. New Brinkerwell, Pleasant Valley, Westmoreland County, Penn- 

 sylvania. (59520. ) 



(9) Light red. Gait/ well, Washington, Washington County, Pennsylvania. 

 (59527. ) 



(10) Amber. Hess, Sacket & Eichner well No. 1, Reidsburgh, Clarion County, 

 Pennsylvania. (59581.) 



(11) Yellow. Riggs Gas well, Moundsville, Marshall County, West Virginia. 

 (59579. ) 



(12) Light yellow. Farm of .1. Somerville, near Brady's Bend, Armstrong County, 

 Pennsylvania. (59494. ) 



(13) Light straw. Holden Run, Armstrong County, Pennsylvania. (53516.) 



(14) Nearly colorless. Venezuela. (59835.) 



3. EXHIBIT ILLU.STRATING GEOLOGICAL DISTRIBUTION. 



The series is arranged in a generally descending order. There is a 

 certain amount of overlapping, however, between the West Virginia 

 and Pennsylvania series, since the oil-bearing strata in these two States 

 have not been correlated. 



(1) From the Tertiary sandstone. Dark greenish. Pico district, Los Angeles 

 County, California. (59552. ) 



(2) From the Cretaceous formation. Dark greenish. Canon City, Fremont County, 

 Colorado. (59548.) 



The following thirteen specimens are from the West Virginia oil 

 field. Their location in depth is referred to the Crinoidal limestone as 

 a datum line: 



(1) 50 feet alcove the Crinoidal limestone. Black; specific gravity 28° Baume. 

 Oil in sand; depth of well 56 feet; drilled 1859; not torpedoed; yielded 100 l)arrels of 

 oil on first day of pumping. Well No. 1, Dutton farm, Aurelius, Washington County, 

 Ohio. (59855. ) 



(2) 100 feet below the Crinoidal limestone. Dark greenish. Oil in sand; depth 

 of well 150 feet; drilled 1882; torpedoed; yielded 10 barrels of oil on first day of 

 pumping. Farm of Frank Atkinson, Aurelius, Washington County, Ohio. (59854.) 



