444 Prosser — Strati graphic Position of Llillshoro Sandstone. 



3. Leper ditia ohioensis Bassler. 



The four species listed above from the Monroe limestone 

 overlying the Hillsboro sandstone on the southern slope of 

 Quaker Hill all occur in the Greenfield dolomite at Greenfield. 

 The three species of brachiopods were all reported by Whit- 

 field from the hydraulic limestone or waterlime beds of the 

 Lower Helderberg group [Greenfield dolomite] of Greenfield, 

 Ohio, and Grabau in his monograph on the Monroe formation 

 has not increased the range or localities of these species. The 

 Lejperditia ohioensis is given by Grabau as occurring in the 

 Greenfield dolomite both at Greenfield and Ballville, Ohio, 

 and in addition in the lower Monroe formation of Bellevue, 

 Ohio. So far as the evidence of these fossils goes it shows 

 that the limestone overlying the Hillsboro sandstone on Quaker 

 Hill may be correlated with the Greenfield dolomite of Green- 

 field. 



A few fossils were also found in the middle qnarry on the 

 Mrs. Ellen Burns farm, which is apparently stratigraphically 

 below the upper zone of the Hillsboro sandstone. The two 

 following species were collected in this quarry : 



1. Hindella? (Greenfieldia?) rotundata (Whitfield) Grabau. 



2. Lejperditia ohioensis Bassler. 



The specimens of Lejperditia are the more abundant and 

 both of the above species occur in the Greenfield dolomite, as 

 has already been stated. It is also to be noted that both species, 

 so far as known, are restricted to the Monroe formation, and 

 this together with the lithologic appearance of the rock seems 

 to prove conclusively that the upper zone of the Hillsboro 

 sandstone on Quaker Hill occurs in the Monroe formation in 

 the Cayugan series instead of at the top of the Niagaran series. 



In the highway section is a lower zone of sandstone (No. 5), 

 the top of which is 12^ feet below the lowest exposure of the 

 upper sandstone stratum (No. 10). All of this intervening 

 rock has the lithologic appearance of the Monroe and although 

 fossils were not found in the exposures along the highway, still 

 it is believed to belong in the Monroe. Also below the lower 

 sandstone stratum is a zone of thin-bedded limestone, 2 feet 11 

 inches thick, which lithologically is fairly similar to the Mon- 

 roe ; before the buff, porous rock is reached which is con- 

 sidered as belonging in the Cedarville dolomite. Fossils were 

 not found in the upper two zones (Nos. 2 and 3) of the Cedar- 

 ville, which have a thickness of 14 feet 10 inches ; but about 

 two-thirds of this interval is covered and the opportunity for 

 hunting fossils along the road is not good. In the next lower 

 zone (No. 1), 4 feet of which was shown in the excavation for 



