376  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904.         [bull.  260. 
Heel  ion   of  J  agger  seam  on  Louisville  and  Nashville  Railroad  between  Adger 
and  Johns. 
Shale :                                                                                                                 Inches. 
Coal     30 
Section  of  Jagger  seam  at  Davis  Creek  mine,  Rock  Castle. 
Shale:  Inches. 
Coal  19 
Clay  G£ 
Coal  11 
Rash   3 
Coal  28 
Clay  4i 
Coal 12 
Total 84 
Section  of  Jagger  seam  at  Yolande  mine,  Tolande. 
"  Coal  slate  :  "  Inches. 
Coal    2 
Slate  1 
Rash   6 
Coal 20 
Slate   5 
Coal    39 
Slate   4       4 
Coal    14 
Slate — 
Total 97 
There  is  a  difference  of  opinion  as  to  the  identity  of  the  seam  mined 
at  these  points,  some  maintaining  that  it  is  the  Blue  Creek  seam. 
There  are  reasons  for  both  opinions,  but  the  matter  can  not  be  dis- 
cussed here,  though  the  writer  is  inclined  to  favor  the  view  that  the 
seam  is  the  Blue  Creek. 
Along  the  Louisville  and  Nashville  Railroad,  southeast  of  Valley 
Creek  station,  there  is  a  coal  seam  outcropping  that  Mr.  McCalley 
identifies  as  the  Ream  seam.  This  is  generally  composed  of  thin 
layers  of  coal  and  shale  or  clay,  and  only  in  one  section  appears  to 
have  a  sufficient  thickness  of  coal  to  be  minable. 
BLACK    CREEK    OROTJP. 
The  Jefferson  seam,  as  identified  by  the  writer  in  the  little  stream 
west  of  Adger  and  on  the  Louisville  and  Nashville  Railroad,  near 
Jeebi,  consists  of  several  thin  benches  of  coal  and  clay,  the  whole 
being  from  6  to  10  feet  thick.  Mr.  McCalley  gives  a  number  of 
measurements  in  both  the  Big  and  Little  basins  in  which  this  seam 
runs  from  10  to  42  inches.    It  is  generally  much  broken  by  clay  parti 
