358 
CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904.        [bull.  200. 
of  Tuscaloosa   County.     Tuscaloosa  is  situated  3  miles  west  of  the 
western  boundary. 
EXTENT   OF    THE   COAL  FIELD. 
About  one-half,  or  500  square  miles,  of  the  quadrangle  lies  in  the 
Warrior  coal  basin.  This  area  embraces  about  one-sixth  of  the  total 
area  of  the  basin  and  includes  all  of  the  quadrangle  lying  northwest 
of  a  line  roughly  drawn  from  the  vicinity  of  Earnest  southwestward 
along  the  northwestern  flank  of  Rock  Mountain  to  Wawah,  running 
Fig.  20. — Sketch  map  of  the  Warrior  coal  basin,  in  the  Brookwood  quadrangle,  Alaban 
thence  about  2  miles  northwest  of  Union  Church,  then  turning  mo 
to  the  southwest,  and  reaching  the  Alabama  Great  Southern  Ra 
road  at  Dudley.  From  Dudley  the  outcrop  of  the  Carbonifero 
rocks  follows  in  a  general  way  the  railroad  to  Cottondale;  thence 
follows  Hurricane  Creek  to  Black  Warrior  River,  and  the  river 
Tuscaloosa.  South  of  the  limit  indicated  above,  these  rocks  extei 
below  the  surface  and  possibly  underlie  all  the  southwestern  corn 
of  the  quadrangle  west  of  a  line  running  from  Dudley  through 
point  about  2  miles  east  of  Pearl. 
