Mercer Limestone ^n Newark-Zanesville Region 



271 



THICKNESS 



TOTAL 

 THICKNESS 



Mercer Umestojie. The top of the hill is covered with 

 broken blocks of dark blue very fossiliferous lime- 

 stone which weathers into somewhat shaly frag- 

 ments. None of the limestone is in place, and the 

 heaviest block seen measured 8 inches in thickness. 

 A small proportion of these fragments are less 

 shaly and when weathered are buff in color and 

 much lighter in weight than the shaly dark blue 

 limestone. They are extremely fossiliferous, but 

 the fossils are, as a rule, not so well preserved as in 

 the blue limestone. 



Covered to the horizon of the Sharon coal. One hun- 

 dred feet by barometer below the top of the hill are 

 the remains of "ore diggings" on the eastern side of 

 the hill, where ore has been worked by sti'ipping. 

 Ore is said to have been taken out here about 1850 

 and shipped to Mary Ann Furnace on the north 

 side of the Licking river in ]\Iary Ann township. 



Sharon coal {?). There is an old coal entry near the 

 house on the west side of the hill. The thickness 

 of this coal is given by M. C. Read in his account 

 of the geology of Licking county as 30 inches. On 

 the north side of the hill are more recent entries 

 where the coal is reported to be 27 inches thick. 

 The coal has not been worked for a number of years 

 and all the openings have fallen in, and there is 

 some uncertainty as to whether thej- are all in the 

 Sharon horizon. 



Covered interval. 



Sharon conglomerate. Coarse-grained quartzose sand- 

 stone with layers of conglomerate; light buffy col- 

 ored, but much of it iron stained and weathered red 

 oi red-brown. The pebbles in the conglomerate 

 are small, most of them loss than one-fourth inch in 

 diameter, generally but not all white quartz, and 

 cemented rather loosely, so that when the rock is 

 broken the pebbles along the fracture are loosened 

 from the matrix instead of breaking. 

 Base of the Pottsville formation. 



Feet 



Feet 

 lS7i 



125^ 



}S7k 



62 



48 



m 



o9h 



The following fossils were collected from the limestone on top 



of the hill: 



Septopora rectistyla Whitfield 



