542 GEOLOaT OF OHIO. ' 



GEOLOGICAL STRUCTUEE. 



The geological structure of the county is well illustrated by the general 

 section on the opposite page. There is no county in the State where the 

 exposures of the coals and limestone are more numerous, or where they 

 can be traced from hill to hill with more certainty, and the intervals 

 between them measured with greater precision, nor any which better ' 

 illustrates the want of parallelism in the rock strata, unless it be perhaps 

 the Great Vein Territory of Perry, Athens, and Hocking counties. 



The lowest rocks exposed in the county belong to the Wav.erly group, 

 the ravines in places cutting down fully two hundred feet into this for- 

 mation. It covers the greater part of Washington 'township, and on lot 

 three the Lozier quarries furnish heavy stone of very fair quality, 

 which is shipped for bridge-building and other purposes, to the adjoining 

 counties. From twelve to fifteen feet of this quarry is composed of 

 hard, fine stone, in layers varying from two to four feet, with from six 

 to twelve inches of silicious iron ore at the bottom. The quarry is by 

 barometrical measurement one hundred and seventy feet below the base 

 of the thin deposit of conglomerate which caps the hill above, and the 

 section here, compared with that of the first ravine directly south, illus- 

 trates the topography of the county at the commencement of the depo- • 

 sition of the Coal Measure rocks. 



