SUPPLEMENTAL REPORT—HANGING ROCK DISTRICT. 889 
while the distance from the Gray to the Buff Limestone is somewhat in- 
creased. ; 
In Jackson and Scioto counties, there is an interval of about one hun- 
dred feet between the representative of the Maxville and the Zoar. 
From the Zoar to the Gray Limestone, there is a still larger interval 
than in Vinton county, the dist1nce now being one hundred and sixty feet. 
In Lawrence county, the lowest horizon is not reached, but the inter- 
val last named, between the Blue and Gray Limestones, is repeated. 
The interval between the Gray Limestone and the Buff is also found the 
game as in Jackson county, the average distance being one hundred and 
thirty to one hundred and forty feet. From the Shawnee to the Cam 
bridge, the distance ranges between one hundred and ten and one hun- 
dred and twenty feet. No measure from the Cambridge to the Ames was 
found in Lawrence county, but a single one taken in Galiia county 
showed the distance there to be one hundred and forty feet. These facts 
are represented in the appended diagram—(Limestones of the H. R. 
District.) : 
In the diagram are also shown the places of various other limestone 
horizons that occur in the series. There are none of them, however, 
that are equally persistent with those named above. Local patches of 
limestone are scattered through the district of which no account can be 
taken. Found in some single section, they may never be met with 
again, but the accessory seams to which reference is now made, have 
quite a wide distribution. One of them, particularly, the Gore Lime- 
stone of the section, is found at thirty to forty feet above the Zoar. It 
can be traced as a lime, or flint, or ore horizon, from the Hocking Val- 
ley quite to the Ohio River. It does not, however, make a continuous 
bed of limestone, for any large area. 
At twenty-five feet below the Shawnee or Buff Limestone a lower Buff — 
Limes'one is often met. It isnamedin the section, the Norris Limestone, 
In Southern Ohio, if correctly identified, it becomes an important ore hor- 
izon. Atastilllowerlevel, the Snow Fork Limestoneisfound in the north- 
ern part of the district. It is better developed on the stream from which it 
takes its name than elsewhere. It, also, is a Buff Limestone. A local 
limestone of considerable extent is found in northern Gallia county, about 
midway between the Shawnee and the Cambridge Limestones. It is blue 
and fossiliferous, and has sometimes been mistaken for the Cambridge. 
It is found at the exact horizon of an important iron ore of that vicinity, 
viz., the Banda ore, which replaces it throughout several townships. It 
is named the Flag Spring Limestone, from a well known locality in Walnut 
township, Gallia county, where it is best developed. Finally, the Ewing 
