REPORT OX FIELD WORK IN GEOLOGY. II5 



The combined sum of the strata from our starting point in the 

 Indian Territory to Peabody, a distance of 150 miles straight, is 1963 

 feet, if we take the average thickness given in the foregoing 

 pages. Of this, 327 feet represent the total limestone, and 1636 the 

 shales and sandstone. This gives the ratio of limestone to shales 

 and sandstone as i : 5, or of limestone to whole thickness i : 6. 

 The elevation of Peabody is about 637 feel above our starting point. 

 Subtracting this from the total thickness, 1963 feet, we have 1328, 

 which represents the total dip of the strata in this direction, which 

 is almost exactly 9 feet to to mile. 



It is exeedingly probable that the surface of the Misssissippian forni-i 

 ation has a greater depth than this at Peabody, for borings at numer- 

 our points in the state indicate that the nonconformity at the surface 

 of the Mississippian results in the existence of different formations to 

 the west which do not outcrop anywhere to the east. This subject is 

 discussed in another division of the present paper in this number of 

 the Quarterly. 



A Geologic Section along- the Verdigris River from the 

 State Line to Madison. 



ERASMUS HAWORTH AND W. H. H. PIATT. 



[This section was made along the Verdigris river from the state line to Madison, a dis- 

 tance of about ninety miles. Figure 1, plate V,, represents the elevation 011 the 

 colored line in blue along the Verdigris river shown on the map. Instead of folic vy- 

 ing the meanderings of the stream with the drawings, it was thought best to follow 



straight lines. ] 



It is reported that a limestone which is 60 or 75 feet below the first 

 one observed by us may be found in the river below the state line. 

 At the state line the surface is covered with a heavy bed of shale 

 which, in the adjoining hills, is about 150 feet thick. Below the 

 shales a heavy limestone exists which is only a few feet thick where 

 first observed, but which increases to nearly forty feet thick in the 

 environs of Independence, and which we will temporarily call the 

 Independence limestone, 



The shale beds above this hav^e a great deal of sandstone in places, 

 so much so indeed that the sandstone becomes more noticeable than 

 the shale. Near the top of the system a six-inch bed of coal exists, 

 which probably extends to beyond Independence; or if not the same 

 one then other similar beds occur. Heavy sandstone overlies the 

 coal, and a limestone system caps the hills above the sandstone, 

 'rhis limestone system extends from a few miles above Coffeyville to 



