334  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
Turner  (Henry  W.) — Continued. 
17.  The  Terlingua  [Texas]  quicksilver  deposits. 
Econ.  Geol.,  vol.  1,  pp.  265-281,  3  figs.,  1905. 
Describes  the  general  geology,  the  geologic  occurrence  of  the  ore  deposits,  the  character  and 
extent  of  the  lodes,  the  origin  of  the  ores,  and  associated  minerals. 
Tuttle  (George  W.). 
1.  Recent  changes  in  the  elevation  of  land  and  sea  in  the  vicinity  of  New  York  City. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  17,  pp.  333-346,  1904. 
Discusses  detailed  investigations  upon  tidal  variation  and  their  bearing  upon  the  question 
of  the  elevation  or  subsidence  of  the  land. 
Tutton  (C.  H.). 
1.  The  laws  of  river  flow. 
Assoc,  of  Eng.  Soc,  Jour.,  vol.  28,  pp.  32-37,  1902. 
Contains  discussion  on  the  origin  and  flow  of  streams. 
Tyrrell  (J.  Burr). 
1.  Report  on  the  east  shore  of  Lake  Winnipeg  and  adjacent  parts  of  Manitoba  and 
Keewatin,  compiled  by  D.  B.  Dowling. 
Can.  Geol.  Surv.,  new  ser.,  vol.  11,  Rept.  G.,  96  pp.,  3  pis.,  1901.     Published  in  1900. 
Describes  the  physiography  and  drainage  of  the  region  and  the  character  of  the  crystalline 
rocks. 
2.  A  peculiar  artesian  well  in  the  Klondike. 
Eng.  &  Mg.  Jour.,  vol.  75,  p.  188.  1  fig.,  1903. 
Describes  geologic  structure  of  the  region  and  the  conditions  producing  the  artesian  flow  of 
water. 
3.  Report  on  explorations  in  the  northeastern  portion  of  the  district  of  Saskatchewan 
and  adjacent  parts  of  the  district  of  Keewatin. 
Can.  Geol.  Soc,  Ann.  Rept.,  new  ser..  vol.  13,  48  pp.,  1  pi.,  and  map,  1903.  (Published  sepa- 
rately, 1902.) 
Describes  the  occurrence  and  characters  of  Pleistocene  deposits  and  Cambro-Silurian  and  pre- 
Cambrian  rocks,  includes  a  list  of  glacial  strise  and  observations  on  the  geologic  structure, 
igneous  rocks,  and  minerals  of  the  region  examined. 
4.  Crystosphenes  or  buried  sheets  of  ice  in  the  Tundra  of  northern  America. 
Jour.  Geol.,  vol.  12,  pp.  232-236,  1  fig.,  1904. 
Describes  the  occurrence,  character,  and  mode  of  formation  of  the  masses  of  ice  for  which  the 
names  crystosphene  and  crystocrene  are  proposed. 
U. 
Udden  (Johan  August). 
1.  A  geological  section  across  the  northern  part  of  Illinois. 
111.  Bd.  of  World's  Fair  Commissioners,  Rept.,  pp.  117-151,  1  pi.  (section),  1895. 
Describes  geology  of  northern  Illinois  and  gives  records  of  borings  and  other  sections. 
2.  Geology  of  Louisa  County  [Iowa]. 
Iowa  Geol.  Surv..  vol.  11,  pp.  58-126.  1  pi.,  1  fig.,  2  maps,  1901. 
Describes  the  physiography,  the  character  and  distribution  of  the  Carboniferous  and  Pleisto- 
cene deposits  and  the  occurrence  of  economic  products. 
3.  Geology  of  Pottawattamie  County  [Iowa]. 
Iowa  Geol.  Surv.,  vol.  11,  pp.  202-277, 1  pi.,  3  figs.,  and  map,  1901. 
Describes  the  physiography,  the  character  and  occurrence  of  the  Carboniferous,  Cretaceous, 
and  Pleistocene  strata  and  the  occurrence  of  economic  products. 
4.  Loess  with  horizontal  shearing  planes. 
Jour.  Geol.,  vol.  10,  pp.  245-251,  1902. 
Describes  partings  in  the  loess  and  discusses  their  origin. 
5.  Geology  of  Jefferson  County  [Iowa] . 
Iowa  Geol.  Surv.,  vol.  12,  Ann.  Rept.  for  1901,  pp.  357-437,  4  figs.,  geol.  map,  1902. 
Describes  physiographic  and  drainage  features,  the  geologic  formations,  giving  sections  and 
lists  of  fossils,  and  the  economic  products  of  the  county. 
