Prosser — Stratigraphic Position of Hillsboro Sandstone. 445 



the Benigar house, specimens of Trimerella (a genus that 

 according to Schuchert is confined to the Guelph and Niagara 

 of the United States and Canada and the Upper Silurian of the 

 Baltic region in Europe) were found, and the lithologic appear- 

 ance of the rock is that of the typical Cedarville dolomite, so 

 that apparently there is no question as to this rock belong- 

 ing in that formation. 



SECTIONS NEAR HILLSBORO. 



It is, of course, possible that the sandstones described by 

 Dr. Orton at several localities in Highland County may occur 

 at more than one horizon. This apparently is true if Dr. 

 Orton's statement is correct that " the sandstone is interstrati- 

 fled with the Pentamerus and Megalomus beds "* in the Grady's 

 Hill section, four miles north of Hillsboro. The outcrops along 

 the pike from Hillsboro to Samantha were carefully examined, 

 and rock with the lithologic characters of the Cedarville dolo- 

 mite was found to within 15 feet of the top of the hill at the 

 four corners near the house of Charles F. Chaplin. Mr. Chaplin 

 stated that he had never seen sandstone on his farm, and the 

 nearest outcrop he knew is on Lilley's Hill, to the east of 

 Hillsboro. 



The top of Lilley's Hill, about one mile east of the Parker 

 Hotel in Hillsboro, is the locality from which Dr. Orton named 

 the sandstone. The pike from Hillsboro to Marshall crosses 

 this hill and gives the best outcrops to be found on it ; but 

 they are not continuous and the sandstone occurs in loose blocks, 

 apparently from a broken down ledge. 



Section of upper part of Lilley's Hill. 



Total 

 Thickness Thickness 

 No. Ft. In. Ft. In. 



3. Top of hill in field above highway. Cov- 

 ered. Seven feet as leveled by Mr. 

 Wendell Z. Miller 7 31 6 



2. Hillsboro sandstone. — Loose blocks of 

 fairly massive, light gray to brownish- 

 gray, friable, quartz sandstone, near 

 the summit of the hill, on the northern 

 side of the highway, opposite the house 

 of Lea Williams. Lower part of zone 

 mostly covered. Ten feet according 

 to the barometer, and 9£ feet as leveled 

 by Mr. Miller 9 6 24 6 



* Geol. Survey Ohio, Report Progress in 1870, 1871, p. 283. 



