SUrPLEMEXTAL 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 distance now beingone hundred and sixty feet. 



In Lawrence county, the lowest horizon is not reached, but the iater- 

 val last named, between the Blue and Gray Limestones, is repeated. 

 The interval batween the Gray Limestone and the Buff is also found the 

 same as in Jackson coanty, the average distance beingone 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 Gallia county 

 showed the distance there to be one hundred and forty feet. Tbese 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 ma«le, have 

 quite a wide distribution. One of them, particularly, the Gore Lime- 

 stone of the sectioni 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 quits 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 

 Limestone is often met. It is named in the section, the Norris Limestone* 

 In Southern Ohio, if correctly identified, it becomes an important ore hor- 

 izon. Atastilllowerlevel, the SnowFork Limestone is found in the north- 

 ern part of the district. It is better developed on the stream from which it 

 takes its name than elsewhere. It, alsD, is a BuS Limestone. A local 

 limestjne 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 ex'ict horizon of an important iron ore of that vicinity, 

 viz., the Banda ore, which replaces it throughout several townships. It 

 i's named the Flag Spring Limestone, from a well known locality in Walnut 

 township, Gallia county, where it is best developsd. Finally, the E wing 



