22 Bulletin 9 214 



blue and fine sand, which is sometimes sufficiently indurated 

 to form sandstone ; the latter is better seen lower down the 

 creek. 



" SeBion on Horse Creek. 



1 . Surface beds 



2. Dark clay 3 feet 



3. Lignite 3 feet 



4. Blue sand, and sometimes sandstone 



" About a mile from Choctaw Corner, a highly interesting 

 locality was pointed out to me by Mr. Worrel : at this place, 

 I saw the preceding bed of lignite, with the addition on the 

 the top of a bed of marl four feet thick, containing a consid- 

 erable proportion of green sand, having embedded in it Cardita 

 planicosta, and other easily recognized Eocene fossils ; the whole 

 resting upon a stratum of blue sand. 



"The following diagram exhibits the order of super-position, 

 and thickness of the beds at this locality : 



''Sefiion on Bashi Creek. 



1. Hard limestone 4 feet 



2. Marl highly fossiliferous 25 feet 



Blue sand. Variable 



lyignite and clay 6 feet 



Laminated cla)^ sand, and mud. Thickness unde- 

 termined 



6. Lignite. Thickness undetermined 



"i. This is a bed of hard rock, differing in composition but 

 little from the marl which underlies it, excepting in its greater 

 hardness. It appears to overlie the marl pretty generally, for 

 I found it at localities miles distant. When cut through by 

 the streams, or fissured (which is often the case ) from any 

 cause, the marl below is washed out, and caves of small extent 

 are formed. 



"2. The marl of this bed presents all the charatfters of the 

 substance so called in Virginia, excepting perhaps, that the fos- 

 sils are in a finer state of preservation, than any found in the 

 Eocene beds of that State. Green sand is also disseminated 

 through this ; all the dark colored grains, however, do not be- 

 long to this mineral. Green sand is readily distinguished bj' the 



