OF ARKANSAS. 



49 



SECTION OF MARION COUNTY— Continued. 





193 



191 



191 



178 



169 

 1G1 



159 

 117 



139 



1 128 



93 



71 

 67 



16 



L | .. 



I L I 

 L L 



I- l. 



BL | BL 



I ~*t I 



BL | BL 



|sr. | 



SL I si. 



Red and variegated limestone or marble 

 rock- 



White encrinital limestone or marble 

 rock. 



bS. SS 



ML AIL 



MI. 

 ML ML 



L L 



Impure siliceous limestone. 



Soft coarse-grained sandstone. 



Thin-bedded magnesian limestone. 



White fossiliferous limestone, close-tex 

 ured, brittle. 



Birds-eye structured limestone. 



ML ML 



ML 



ML ML 



ML 



ML ML 



ML 

 CR CR 



CR 

 CR CR 



ML 



I L | 



L L 



Magnesian limestone. 

 Siliceous i limestone. 



Calcareous sandstone. 



Buff, checkered magnesian limestone. 



Light-colored limestone with chert, so- 

 called " cotton rock." 



Grey rough-weathering mag. limestone. 



Light-colored limestone in beds from 6 

 to 8 inches in thickness. 





25 



19 



16 



8 

 2 



5 

 5 



10 



11 



35 



12 

 1 



21 



in the State of Wiscon- 

 sin, except that the beds 

 of magnesian limestone 

 are thinner-bedded and 

 less massive, and hence, 

 do not appear in as bold 

 cliffs in Arkansas as on 

 t h e upper Mississippi. 

 The fossils in the lime- 

 stone, at an elevation of 

 161 feet above Sugar 

 Loaf creek, are, mostly, 

 casts and imperfect im- 

 bedded impressions, so 

 that even the genera 

 can hardly be made out; 

 but, so far as they are 

 recognizable, they, as 

 well as the lithological 

 character of the strata, 

 indicate the geological 

 horizon of these rocks as 

 cotemporaneous with the 

 ' lower magnesian lime- 

 stone and interstratified 

 sandstones " of northern 

 Wisconsin, the ' ; calcifer- 

 ous sandrock" of the A'ew 

 York system, and the 

 : ' 2nd magnesian lime- 

 stone and sandstone, and 

 3d magnesian limestone" 

 of the Geological Report 

 on south - western Mis- 

 souri. 



