Prosser — Stratigraphic Position of Hillsboro Sandstone. 447 



Total 

 Thickness Thickness 



No. Feet Feet 



2. Hillsboro sandstone. — Light to darkish 



gray, very friable sandstone com- 

 posed of grains of quartz sand 1± 4± 



1. Drab, porous limestone ; but no fossils 



were seen . - 3± 3± 



On the other side of the north and south road in the field, a few- 

 rods below the house of Mr. Rhoads, is the thickest ledge of the 

 Hillsboro sandstone that was found in this region. 



Section on the A. L. Rhoads farm. 



Total 

 Thickness Thickness 

 No. Ft. In. Ft. In. 



3. Hillsboro sandstone.- — Dark gray sand- 



stone composed of quartz grains and 

 much of it is friable although some 

 of it is harder _ 3 2 6 8 



2. Perhaps covered interval 6± 3 6 



1. The so-called "marl" which is a drab, 



rather soft limestone that crumbles 



on weathering... 3 3 



On the pike just northeast of the A. L. Rhoads' house, and 

 by the barometer 5 feet lower than the quarry on the Stewart 

 farm, is an outcrop of about 8 feet of black, bituminous shale, 

 which evidently is the Ohio shale. 



Another outcrop of the sandstone is shown on the north and 

 south road a few rods north of the four-corners and house of 

 Mr. A. L. Rhoads, where the following section was measured : 



Section on road north of Mr. A. L. Rhoads* house. 



Total 

 Thickness Thickness 



No. Feet Feet 



3. Hillsboro sandstone. — Dark gray, fri- 



able sandstone composed of grains 



of quartz sand . l-Jdr 18 



2. The so-called " marl " which is used for 



highways. Drab colored, rather 

 granular limestone in which no fos- 

 sils were found, that is supposed to 



be Monroe 14+ 16£ 



1. Massive drab-colored limestone at base 

 of road section, which contains Favo- 

 sites, and possibly belongs in the 

 Cedarville dolomite <l\ 2£ 



Am. Jour. Sci. — Fourth Series, Vol. XLI, No. 245.— May, 1916. 

 31 



