58 W.S. GRESLEY—CLAY-VEINS INTERSECTING COAL MEASURES. 
Pennsylvania Geological Survey, vol. 8, part 2. Summary Final Report, 1895, plate 
504. 
J. P. Lesley: ‘‘A remarkable coal or asphalt vein, cutting the horizontal coal 
measures of Wood county, West Virginia,” 1863. 
G. M. Dawson: Acadian geology, 1868, page 234; Vein of Albertite in shale in 
New Brunswick. 
Effects of the Earthquake at Charleston on 31st August, 1886: Report of Director 
U. S. Geological Survey, 1888, 1889, plate xxiii, opposite page 302. 
J. S. Diller: Sandstone dikes. Bulletin of the Geological Society of America, vol. 1, 
p. 411. 
Whitman Cross: Intrusive sandstone dikes in Granite. Bulletin of the Geological 
Society of America, vol. 5, p. 225. 
C. R. Keyes: Crustal readjustment in the upper Mississippi valley. Bulletin of 
the Geological Society of America, vol. 5, p. 239. 
A. P. Pavlow: Dikes of Oligocene sandstone in the Neocomian clays of Alatyr in ~ 
Russia. Geological Magazine, May, 1896, p. 49. 
