FOR    THE    YEARS    1901-1905,   INCLUSIVE.  65 
Clark  (William  Bullock) — Continued. 
3.  Reports  on  Garrett  County  [Maryland] . 
Md.  Geol.  Surv.,  Garrett  Co.,  340  pp.,  26  pis.,  12  figs.,  1902.     Atlas  with  2  maps. 
4.  The  Cretaceous-Eocene  boundary  in  the  Atlantic  coastal  plain. 
Abstract:  Science,  new  ser.,  vol.  17,  p.  293, 1903. 
5.  The  Matawan  formation  of  Maryland,  Delaware,  and  New  Jersey,  and  its  rela- 
tions to  overlying  and  underlying  formations. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  18,  pp.  435-440,  1904;  Johns  Hopkins  Univ.  Circ,  1904,  pp.  692-699 
(no.  7,  pp.  28-35),  1904. 
Includes  a  table  showing  correlation  of  Atlantic  coast  Cretaceous  formations  with  Creta- 
ceous formations  of  Europe. 
6.  The   Miocene  deposits   of    Maryland.     Introduction   and   general    stratigraphic 
relations. 
Md.  Geol.  Surv.,  Miocene,  pp.  xxiii-xxxii,  1  pi.,  1904. 
7.  Systematic  paleontology. of  the  Miocene  deposits  of  Maryland:  Echinodermata. 
Md.  Geol.  Surv.,  Miocene,  pp.  430-433,  2  pis.,  1904. 
8.  Origin,  distribution  and  uses  of  coal. 
Md.  Geol.  Surv.,  vol.  5,  pp.  221-240,  3  pis.,  1905. 
Gives  a  general  account  of  the  use,  origin,  occurrence,  and  \  roduction  of  coal,  and  the 
extent,  character  of  the  coal,  etc.,  of  the  Appalachian  coal  field. 
Clark  (William  Bullock)  and  Bibbins  (A.). 
1.  Geology  of  the  Potomac  group  in  the  middle  Atlantic  slope. 
Geol.Soc.  Am.,  Bull.,  vol.  13,  pp.  187-214,7  pis.,  1  fig.,  1902. 
Describes  the  character,  occurrence  and  distribution  of  .the  divisions  of  the  Potomac  group, 
the  interpretation  of  these  deposits  and  the  surface  configuration  of  the  crystalline  floor  and 
of  the  Potomac  group.    Discusses  the  age  of  these  deposits. 
2.  The  Potomac  group  in  Maryland. 
Abstract:  Science,  new  ser.,  vol.  15,  p.  905,  1902. 
Clark  (William  Bullock)  and  Martin  (George  Curtis). 
1.  The  Eocene  deposits  of  Maryland. 
Md.  Geol.  Surv.,  Eocene,  pp.  21-92,  14  pis.,  1901. 
Describes  the  general  stratigraphic  relations,  distribution,  characters,  origin  of  the  materi- 
als, and  the  stratigraphic  and  paleontologic  characteristics  of  the  Eocene  strata.  Discusses 
their  correlation. 
2.  Eocene  Mollusca. 
Md.  Geol.  Surv.,  Eocene,  pp.  122-203,  41  pis.,  1901. 
3.  Eocene  Molluscoidea  (Brachiopoda). 
Md.  Geol.  Surv.,  Eocene,  pp.  203-205,  1  pi.,  1901. 
4.  Eocene  Echinodermata. 
Md.  Geol.  Surv.,  Eocene,  pp.  232-233,  1  pi.,  1901. 
5.  Correlation  of  the  Coal  Measures  of  Maryland. 
Geol.  Soc.  Am.,  Bull.,  vol.  13,  pp.  215-232,  11  pis.,  1902. 
Describes  the  subdivisions  of  the  Coal  Measures  group  in  Maryland  and  discusses  their  corre- 
lation with  the  Coal  Measures  of  other  portions  of  the  Appalachian  province. 
6.  Correlation  of  the  formations  and  members  [of  the  Maryland  coal  district]. 
Md.  Geol.  Surv.,  vol.  5,  pp.  291-315,  5  figs.,  1905. 
Clark  (Wm.  Bullock),  Martin  (George  C. )  and  Rutledg-e  (J.  J.). 
1.  Distribution  and  character  of  the  Maryland  coal  beds. 
Md.  Geol.  Surv.,  vol.5,  pp.  317-512,  15  pis.,  1  fig.,  1905. 
Clarke  (C.  II.). 
1.  Notes  on  the  Michipicoten  gold-belt. 
Eng.  &  Mg.  Jour.,  vol.  76,  pp.  735-736,  1903. 
Describes  the  occurrence  of  gold  ores  and  the  mining  developments. 
Bull.  301—06 5 
