HOCKING VALLEY COAL FIELD. 915 
“wants”. A cloud is thrown upon a section or farm if, upon trial, the 
coal is found deficient or faulty. This question as to the state of the 
coal is expressed upon the map by the broken lines, but there is no 
doubt that in many cases bodies of good coal will be found in this 
broken territory. The text will treat of these several DE as 
far as they have been made known. 
Attention must also be called to the fact that the townships most 
thoroughly tested are those most scarred, upon the map, by signs of 
deficient coal. That the coal lines of certain other townships are un- 
broken is due, without doubt, to our want of knowledge of the field. 
Wants and reductions will undoubtedly be found as soon as develop- 
ment begins. 
No account of exhausted areas is taken in the representation of the 
coal. A considerable acreage has already been worked out in the most 
valuable part of the field, but the boundaries on the map are designed 
to indicate the original outcrop. 
Previous Geological Reports upon the Hocking Valley Field. 
The earliest methodical and detailed account of the geology of the 
Hocking Valley is to be found in the Report of Progress of the State 
Geological Survey for 1869. This important field was there made the 
subject of an excellent and widely distributed report by the late Pro- 
fessor EK. B. Andrews, within whose geological district it was included. 
Its main coal seam was traced by him to New Lexington, on the east, 
where it was identified with the Upper New Lexington coal, and to 
Carbondale, on the south, where it was shown to be the coal mined in 
the large way for the Marietta and Cincinnati Railway Company. The 
establishment of these connections was a very important service to the 
geology of the Coal Measures of Ohio. 
Many facts pertaining to the stratigraphical order of the field were 
also published, and the elements of a general section were accumulated. 
The economic geology of the coal and ore also received special atten- 
tion. By Professor Wormley’s analyses, the excellent character of the 
main Hocking Valley seam was fully accredited from a chemical point 
of view, while the rapid development of mining that was going forward 
along the newly-built lines of the Columbus and Hocking Valley Rail- 
way, and the successful establishment of blast furnaces in the district, 
