GEOI.OGY OF IvA SALIvE COUNTY. 



61 



beds. No. 8, the upper La Salle bed about La Salle 

 and north as far as the north line of La Salle Town- 

 ship, and east to near the tunnel or axis, and south on 

 the east side of the Big Vermillion, covering* a small 

 area just south of Deer Park oflen; west of the Big- 

 Vermillion g-enerally, but thinningf out to south and 

 west of Oglesby. 



Coal No. 7, about Streator and extending- up the 

 valleys of the streams flowing- into the Big- Vermillion 

 in comparatively narrow tongfues, thickest in the mid- 

 dle of the valle}' and thinning- toward either side. It 

 becomes thicker toward the north, until at Kirkpat- 

 rick's ford the bed is about eig-ht feet thick, but one 

 foot of this is shale. It then thins toward the north 

 and disappears in the next two or three miles, to 

 be seen no more on the east side of the stream until 

 near Deer Park g^len, where it covers a small area, then 

 runs out to reappear at Og-lesby and La Salle and 

 to the southwest, being- found at Wenona. At 

 Streator it extends to but a short distance west of the 

 Vermillion scarcel}^ a half mile. It therefore covers 

 but a small area, not more than 130 square miles, per- 

 haps less in this county. 



Coal No. 2 is found over an area of about forty 

 square miles north of the Illinois river, and except in 

 the Illinois and Vermillion valleys over all that part of 

 the county south of the Illinois. About Grand Ridg-e 

 and to the west of it the boring-s have not been deep 

 enoug-h. Here the land attains a heig-hth above or 

 nearly equal to the level of Lake Michigan, and the 

 coal at Ottawa is descending- at the rate of more than 

 thirty-five feet to the mile, and as the surface is 60 feet 

 above Lake Michigan at Grand Ridge; then it must 

 be 6x35 — 210 feet below its level at Ottawa, or 210 feet 

 below the surface, supposing the surface to be at the 



