316  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
Spencer  (Joseph  Williarn  Winthrop) —  Continued. 
5.  On  the  geological  and  physical  development  of  Dominica;  with  notes  on  Mar- 
tinique, St.  Lucia,  St.  Vincent,  and  the  Grenadines. 
London  Geol.  Soc,  Quart.  Jour.,  vol.  58,  pp.  341-353,  1  pi.  [map],  2  rigs.,  1902. 
Contains  notes  on  physiography  and  on  the  volcanic,  gravel,  and  terrace  formations. 
6.  On  the  geological  and  physical  development  of  Barbados;  with  notes  on  Trinidad. 
London  Geol.  Soc,  Quart.  Jour.,  vol.  58,  pp.  354-370,  2  rigs.,  1902. 
Discusses  the  physiographic  and  stratigraphic  features. 
7.  The  Windward  Islands  of  the  West  Indies. 
Can.  Inst,,  Trans.,  vol.  7.  pp.  351-370,  14  pis.,  1902. 
Gives  an  account  of  physiographic  and  geologic  features  of  these  islands. 
8.  On  the  geological  relationship  of  the  volcanoes  of  the  West  Indies. 
Victoria  Inst.,  Jour.  Trans.,  vol.35,  pp.  198-207,  1  fig.,  1903. 
Discusses  physiographic  features  and  changes  of  the  West  Indies  islands  and  the  submerged 
plateau  upon  which  th  sy  rest,  the  place  of  their  igneous  formations  in  geologic  history,  and 
the  evidences  of  the  geologic  age  of  the  volcanic  activity  and  its  relations  to  physical 
changes  in  the  Antillean  region. 
9.  Geological  age  of  the  West  Indian  volcanic  formations. 
Am.  Geol.,  vol.  31,  pp.  48-51,  1  tig.,  1903. 
Discusses  the  geologic  history  of  the  region. 
10.  Submarine  valleys  off  the  American  coast  and  in  the  North  Atlantic. 
Geol.  Soc.  Am.,  Bull.,  vol.  11,  pp.  207-226,  2  pis.,  2  figs.,  1903. 
Describes  the  submerged  Atlantic  coastal  plain  from  Cape  Hatteras  to  Newfoundland  and  the 
channelstraversing  it.  discusses  geological  data  and  evidences  of  the  age  of  th.'  submerged 
valleys,  and  describes  submerged  valleys  of  the  North  Atlantic  and  adjacent  Arctic  basins. 
11.  A  rejoinder  to  Dr.  Ball's  criticism  on  Dr.  Spencer's  hypothesis  concerning  the 
late  union  of  Cuba  with  Florida. 
Am.  Geol..  vol.  34,  pp.  110-119,1904. 
12.  The  submarine  great  canyon  of  the  Hudson  River. 
Am.  Geol.,  vol.  34,  pp.  292-293,  1904. 
Describes  the  course,  depth,  etc.,  of  the  Hudson  River  channel. 
13.  The  submarine  great  canyon  of  the  Hudson  River. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  19,  pp.  1-15,  3  figs.,  1905.     Geog.  Jour.,  vol.  25,  pp.  180-190,  3  figs., 
1905. 
Reviews  previous  work  upon  the  subject  and  gives  additional  data  upon  the  position,  depth, 
and  character  of  the  Hudson  River  canyon,  and  discusses  us  origin. 
14.  On  the  physiographic  improbability  of  land  at  the  North  Pole. 
Am.  Jour.  Sci.,  4th  s  r..  vol.  19,  pp.  333-340,  1  fig.  (map),  1905. 
15.  Bibliography  of  submarine  valleys  off  North  America. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  19,  pp.  341-344,  1905. 
16.  Dr.  Nansen's  "  Bathymetrical  features  of  the  north  polar  sea,  with  a  discussion 
of  the  continental  shelves  and  the  previous  oscillations  of  the  shore-line.  " 
Am.  Geol.,  vol.  35,  pp.  221-235,  1905. 
17.  [Discussion  of  paper  by  R.   S.  Tarr,   "Gorges  and  waterfalls  of  central  New 
York."] 
Intern.  Geog.  Cong.,  Eighth,  Rept.,  pp.  136-137,  1905. 
Spencer  (W.  K. ). 
1.  On  the  structure  and  affinities  of  Palaeodiscus  and  Agelacrinus. 
Roy.  Soc,  Proa,  vol.  74,  pp.  31-46,  1  pi.,  12  figs.,  1904. 
The  investigation  described  is  based  in  part  upon  specimens  of  Agelacrinus  from  the  Ordo- 
vician  of  Ohio. 
Spillman  (W.  J.). 
1.  Natural  mounds. 
Science,  new  ser.,  vol.  21,  p.  632,  1905. 
Discusses  the  occurrence  and  origin  of  these  mounds  in  southwestern  Missouri. 
