438 Prosser — Stratigraphic Position of Ilillsboro Sandstone. 



Total 

 Thickness Thickness 

 No. Ft, In. Ft. In. 



7. Light gray, rather porous limestone which 



effervesces strongly in HC1 11 30 9 



6. Partly covered interval ; but showing- 

 some thin-bedded layers and others 

 which are rather thicker with coarser 

 texture and brownish color. The low- 

 est layer has a rather strong effer- 

 vescence in cold HC1 _ 6 1 29 10 



5. Light gray to whitish, quartz sandstone 

 with no effervescence in cold HC1. 

 This sandstone is apparently bedded 

 in the gutter and is the lowest one ex- 

 posed on the highway. The thickness 

 of the interval from the top of the 

 highest sandstone to the base of the 

 lowest one is 16 feet 8 inches . _ 2 23 9 



4. Thinner bedded limestone, mottled light 

 to dark gray color, bituminous odor, 

 fairly strong effervescence in cold HC1, 

 and lithologically somewhat similar to 

 the Monroe _'. 2 11 21 9 



3. Cedarville dolomite. — Buff as weathered, 

 rather poi'ous rock, with scarcely any 

 effervescence in cold HC1, which litho- 

 logically is like the Cedarville 5 8 18 10 



2. Ledge of rock on road which is obviously 

 Cedarville ; but most of the interval is 

 covered ... 9 2 13 2 



1. Gray, glistening dolomite which is very 

 porous, containing holes of some size . 

 and is also bituminous. A few speci- 

 mens of Trimerella were found. At 

 the time this section was studied in 

 1915, four feet of this zone was shown 

 in the eastern wall of the cellar that 

 was being dug for a house on the S. JB. 

 Benigar farm . . 4 4 



Under the lowest layer of sandstone on the western side of 

 the highway is a 17-inch band of black rather gritty shale, and 

 still higher, between the lower sandstone and the porous lime- 

 stone of zone No. 7, black shale also occurs. This black shale 

 was noted by Dr. Orton, for he stated " that the sandstone fre- 

 quently contains thin seams of slate, not to be distinguished 

 in any way by its appearance from the great deposit that is 

 shown in such force in the Eastern hills of the County [High- 



