438  CONTRIBUTIONS    TO    ECONOMIC    GEOLOOY,    1903.  [bull.  225. 
and  may  be  quarried  without  difficulty.  Specimens  have  been  taken 
from  the  different  parts  of  the  bluff  near  the  ferry  which  will  show 
the  composition  of  the  limestone  here  (see  analyses  1,  2, '3,  and  4, 
p.  445).  Other  specimens  are  from  the  Roberts  place,  3  miles  east  of 
Gainesville— one  of  which  was  taken  from  the  top  of  a  30-foot  bluff, 
others  from  the  surface  1  mile  and  5  miles  from  the  river  (analyses 
5  and  6). 
At  Jones  Bluff,  on  the  Tombigbee,  near  Epes  station,  on  the  Ala- 
bama Great  Southern  Railroad,  white  limestone  of  remarkably  uni- 
form composition  shows  along  the  river  bank  for  a  distance  of  a  mile 
or  so,  with  an  average  height  of  perhaps  60  feet.  Here  the  bare 
rock  forms  the  surface,  so  that  there  would  be  no  overburden  to  be 
removed  in  quarrying.  The  railroad  crosses  the  river  at  this  locality, 
which  thus  has  the  advantage  of  both  rail  and  water  transportation. 
From  the  lower  end  of  this  exposure  down  to  Bluffport  the  white 
rock  is  seen  at  many  points,  e.  g.,  below  Lees  Island,  Martins  Ferry, 
JBraggs,  etc.  It  generally  has  a  capping  of  15  to  20  feet  of  red  loam 
and  other  loose  materials. 
Specimens  have  been  analyzed  from  Epes  and  Hillmans  (analyses 
7,  8,  and  9,  p.  445). 
At  Bluffport  the  white  rock  in  places  forms  a  bluff  100  feet  or  more 
in  height  along  the  right  bank  of  the  river  for  a  distance  of  a  mile 
or  more.  This  is  the  counterpart  of  Jones  bluff,  above  mentioned, 
and  the  character  of  the  material  is  shown  by  analysis  No.  10,  p.  445. 
As  at  Epes,  the  rock  extends  up  to  the  surface,  so  that  quarrying 
would  be  attended  with  little  or  no  difficulty.  Below  the  Bluffport 
bluffs  the  easterly  course  of  the  river  brings  it  into  the  territory  of 
the  lower  strata  of  the  formation,  and  the  white  rock  does  not  appear 
again  below  Jordans  Ferry,  except  in  thin  patches  at  tops  of  some  of 
the  bluffs.  The  character  of  the  material  of  these  lower  beds  n:my  be 
seen  from  the  analyses  of  specimens  taken  from  Jordans  and  Belmont 
and  Roes  bluff,  Nos.  11,  12,  13,  and  14.  The  two  specimens  from  the 
last-named  locality  represent  the  composition  of  the  prevailing  dark- 
colored  argillaceous  rock  and  of  the  lighter-colored  ledges. 
At  Demopolis  there  is  an  important  occurrence  of  the  white  rock 
extending  along  the  left  bank  from  a  mile  above  the  landing  to  about 
2  miles  below,  with  average  height  perhaps  of  40  or  50  feet.  The 
rock  is  remarkably  uniform  in  appearance  and  probably  in  composi- 
tion (analysis  30,  p.  446).  At  McDowell's  the  main  bluff  is  on  the 
right  bank  and  the  rock  is  of  great  purity,  as  shown  by  analysis  16. 
The  exposures  continue  down  to  Paces  Landing,  9  miles  below  Demop- 
olis. and  beyond  this  the  bluffs  are  much  darker  in  color  and  striped 
with  lighter  bands,  characteristic  of  the  strata  of  the  upper  part  of 
the  formation.  Thence  down  nearly  to  Moscow  occur  the  exposures 
of  these  upper  beds. 
