112 



THE ALLEGHANY COAL FIELD. 



section No. 3, along the Sandy and Beaver Canal ; but there, 

 fragments of it were seen in the gravel. Neither is the 

 Buhr mentioned in the Monongahela section. 



The last section includes both the lower coal groups and 

 the "lower sandstone groups" of the Virginia Reports, 

 which do not appear to be here separated by a natural 

 division. The '' Hornstone " bed is near the top of the sec- 

 tion, four hundred and seventy feet from the conglomerate ; 

 on the National Road, two hundred and sixty, and on the 

 Alleghany one hundred and three feet. Is this everywhere 

 the same bed encircling the field? In every case it is asso- 

 ciated with the iron ore, in contact and always above it. 



If the divisions into groups can be admitted, we discover 

 the greatest disproportion in their thickness, as well as the 

 number of beds that possess economical value, such as iron 

 ore, coal and limestone. 



The first section, certainly all of it below the lower sand- 

 stone group, is four hundred and forty-seven feet in thick- 

 ness. On No. 2, at the National Road, to the Pomeroy Coal 

 Seam, which is several hundred feet above the Symmes' 

 Creek beds, is four hundred and eighty-seven feet. On No. 

 3, from Clinton to Yellow Creek, the thickness is one thou- 

 sand one hundred and fifty-nine feet, all in the lower group, 

 while in the Alleghany valley it is reduced to four hundred 

 and fifty, and in the Monongahela to two hundred and 

 seventy-four. 



I give also, a recapitulation of the number of coal and 

 limestone beds, in the various parts of the field, which will 

 be seen to be quite different: 



