BiTRCHARD.l      IRON    ORES    IN    RROOKWOOD    QUADRANGLE,    ALA. 
327 
tinued.  Below  is  the  log,  furnished  by  the  Crowe  Coal  and  Iron 
Company,  of  a  diamond-drill  hole  penetrating  the  Rockwood  forma- 
tion at  this  point.  Since  the  rocks  dip  steeply,  the  thickness  in 
vertical  section  is  considerably  exaggerated,  and  allowance  should  be 
made  for  this  discrepancy. 
Record  of  bore  hole  at  Big  Spring,  Ala. 
Clay  and  bowlders 
"  Fort  Payne  "  chert (V): 
Chert '      
Blue  shale 
Cherty  limestone 
Impure  limestone 
Decomposed  limestone,  no  cores  and  caving 
Rockwood  formation: 
Hard  limestone 
Reddish  sandstone 
Impure  limestone,  slate  streak 
Red  mottled  ore-bearing  matter 
Lime  rock,  mottled  red  streaks  with  slate . 
Marbleized  lime  rock,  gray 
Marbleized  lime  rock,  gray,  with  fossils 
Marbleized  lime  rock,  liver-colored  spots 
Lime  and  slate  mixed  alternately 
Dark-brown  crystalline  sand  rock 
Sandy,  ferruginous,  laminated  sandstone 
Sandy  gray  slate 
Streaky  ferruginous  material 
Soft  ore,  no  core . 
Highly  ferruginous  sand,  no  core 
Lean  ore,  streaked  with  slate 
Fossilif erous  ore 
Impure  gray  limestone,  streaked  with  flinty  material 
Red  streaked  sandstone 
Chickamauga  limestone: 
Limestone,  with  spots  of  hard  black  flinty  material-. 
Thick- 
ness of 
forma- 
tions. 
Ft.     in. 
23     0 
63     6 
9     0 
12     0 
3     0 
41     9 
3     3 
55     0 
43     6 
3     6 
40     0 
3     0 
13     0 
12     0 
25     0 
4     0 
45     0 
51     0 
41     0 
G     0 
7     9 
3     0 
5     6 
75     0 
8    0 
109     0 
Ft.  in. 
22  6 
86  0 
95  0 
107  0 
110  0 
151  9 
155  0 
210  0 
253  6 
257  0 
297  0 
300  0 
313  0 
325  0 
350  0 
354  () 
399  0 
450  0 
491  0 
497  0 
504  9 
507  9 
513  3 
588  3 
590  3 
705  3 
The  same  company  has  furnished  the  following  analysis  of  the  ore 
from  the  big  seam.  That  mining  was  unprofitable  here  is  probably 
due  in  large  degree  to  the  small  percentage  of  metallic  iron  in  the  ore. 
