212 



tween the layers of the "soft, sandy limestone." Generally they appear 

 to be nothing more than hues of Lrregular bedding, with a slight difference 

 in the structure of the upper and lower members. 





Tho top <>r tlie Waldron shnlo at r, i.^ V2 f.et. at b 17 feet, at c 18 feet, at d 9 feet above low 

 •water; at e it is below the surface. The fall in the creek bed from ./ to e is 40 inches. 



One mile south of Hartsville, in the Tarr hole vicinity, there seems to 

 be conclusive evidence of a pei-iod of erosion after the Laurel limestone 

 beds were formed and before the shale beds were deposited. Below the 

 Tarr hole Cliffy Creek makes a horseshoe bend within a radius of one- 

 fourth mile. The Tarr hole exposure shows that the top of the Waldron 

 shale is 12 feet above low water, and the shale nearly 7 feet thick. Six 

 hundred feet east the top of the shale is 17 feet above low water 

 and 4V2 feet above the same level at the Tarr hole. Near the 

 middle of the bend Mr. Price estimates the shale to le o feet 

 thick and its top at from 18 to 21 feet above the bed of the creek. 

 In 1881, when the shale was better exposed than now, a section was made 

 at the Turn hole which showed the top of the shale at 12 feet above low 

 water, and the shale 5 feet and 8 inches thick. After due allowance is 

 made for the decline in the bed of the creek, where it passes over a long 

 riffle, it indicates the surface of the shale is 3 feet below a corresponding 

 level north of it at the Tarr hole. Seven hundred feet west of the 

 last locality is the Jesse Mobley quarry, where a well was put down 

 a few years ago that penetrated the Waldron shale 20 feet below the sur- 

 face. Twenty feet below the surface, at this place, puts the top of the 

 shale below the bed of the creek. The writer is certain of the position 

 of the shale in this well, as he has a number of the Waldron fossils 

 taken from It at the time the well was dug. Here the top of the shale, 

 after adding 3 feet for decline in creek bed, is seen to be 15 feet below 

 the same level at the Tarr hole, and from 18 to 21 feet below two other 

 points. 



