GEOLOGY OF LA SALLE COUNTY. 



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black slates, the sandstone below No. 7 — the Streator 

 sandstone, the one above it, the Newton sandstone and 

 the hard, gray, nodular Craddock limestone are the 

 most uniform and extensively distributed strata, and 

 reliable guides to the place of the coal beds in the 

 series. 



The coal at Ottawa, Marseilles and Seneca is No. 

 2. At Marseilles No. 7 has been found in patches near 

 the base of the bluff. It is probably the same bed of 

 which some traces have been found at two or three 

 places in South Ottawa. But that this bed does not ex- 

 ist in mxost of the region between Ottawa and Streator 

 is ver}^ certain, borings 280 to 300 feet deep having 

 failed to find it, or any other coal. About Grand Ridge 

 we presume that No. 2 is at least 330 feet below the 

 surface, and to the southeast still deeper, and it is the 

 only bed that exists there. No, 7 being confined to the 

 vicinit}^ of the Big Vermillion and its tributaries- 

 Some eighty rods south of the entrance to Deer Park 

 glen, in a bluff on the east side of the river, three beds 

 of coal are seen rising out of the water to a heighth, 

 the upper one of eighty feet or more, all three of 

 which have been worked, and which, b}^ reference to 

 our land marks, are at once seen to be Nos. 2, 7 and 8, 

 not 2, 5 and 7, as the State report calls them. 



In the shaft at Wenona, Marshall county, coals 

 Nos. 2, 3, 4, 5, 7 and 8 appear, the first being thirty- 

 two inches thick, the second, four inches; the third, 

 fourteen inches: the fourth, fourteen inches; the fifth, 

 forty inches; and the sixth„ six inches. No. 6 is rep- 

 resented by four inches of black shales. 



The Caledonia shaft in the north part of LaSalle 

 Township is 550 feet deep, shows four beds of coal, 

 one near the top thin, the others. No. 2, 46; No. 7, 42; 

 No, 8, 48 inches thick, and two black slates, each 



