FOE    THE    YEARS    1901-1905,   INCLUSIVE.  335 
Udden  (Johan  August) — Continued. 
6.  Oti  the  occurrence  of  rhizopods  in  the  Pella  beds  in  Iowa. 
Iowa  Acad.  Sei.,  Proc,  vol.  9,  p.  120, 1902. 
7.  Pleuroptyx  in  the  Iowa  Coal  Measures. 
Iowa  Acad.  Sci.,  Proc,  vol.  9,  p.  121,  1902. 
8.  Geology  of  Mills  and  Fremont  counties  [Iowa]. 
Iowa  Geol.  Surv.,  vol.  13,  pp.  123-183,  4  pis.,  1903. 
Describes  topography  and  drainage,  character,  occurrence,  and  geologic  relations  of  Carbon- 
iferous and  Cretaceous  strata  and  surficial  deposits,  and  economic  resources.  Includes  a 
report  by  Prof.  B.  Shimek  on  the  fossils  from  the  loess  of  these  counties. 
9.  Foraminiferal  ooze  in  the  Coal  Measures  of  Iowa. 
Jour.  Geol.,  vol.  11,  pp.  283-281,  1903. 
10.  Note  to  the  article  on  "Foraminiferal  ooze  in  the  Coal  Measures  of  Iowa." 
Jour.  Geol.,  vol.  11,  p.  430,  1903. 
Notes  the  occurrence  of  a  bed  of  foraminiferal  ooze  in  the  upper  Carboniferous  of  Texas. 
11.  The  geology  of  the  Shafter  silver-mine  district,  Presidio  County,  Texas. 
Tex.  Univ.  Min.  Surv.,  Bull.  no.  8.  60  pp.,  11  figs.,  2  pis.,  1904. 
Describes  the  physiographic  features  briefly  and  in  detail  the  occurrence,  character,  and 
geologic  relations  of  Carboniferous  and   Cretaceous  strata,  igneous   rocks,  and  mineral 
deposits,  mainly  silver  ores. 
12.  On  the  proboscidean  fossils  of  the  Pleistocene  deposits  in  Tlinois  and  Iowa. 
Augnstana  Library  Publications,  no.  5,  pp.  45-57,  1905. 
Discusses  the  occurrences  of  the  fossil  remains  of  elephants  and  mammoths  and  their  relations 
to  Pleistocene  deposits. 
Udden  (Jon  Andreas).  . 
1.  Geology  of  Clinton  County  [Iowa]. 
Iowa  Geol.  Surv.,  vol.  15,  Ann.  Rept.,  1904,  pp.  369-431,  2  pis.,  1  fig.,  2  maps.  1905. 
Describes  the  physiography,  the  occurrence,  character,  and  relations  of  Ordovician,  Silurian, 
and  Carboniferous  strata  and  Pleistocene  deposits,  and  the  economic  resources. 
Uhler  (P.  R.). 
1.  The  Niagara  period  and  its  associates  near  Cumberland,  Md. 
Md.  Acad.  Sci.,  vol.  2,  pp.  19-26,  1905. 
Describes  Silurian  strata  in  the  vicinity  of  Cumberland,  Maryland,  and  gives  lists  of  fossils 
obtained. 
Ulrich  (Edward  Oscar). 
1.  Systematic  paleontology,  Eocene  Arthropoda. 
Md.  Geol.  Surv.,  Eocene,  pp.  116-122,  1  pi.,  1901. 
2.  Eocene  Molluscoidea  (Bryozoa). 
Md.  Geol.  Surv.,  Eocene,  pp.  205-222,  2  pis.,  1901. 
3.  The  lithographic  stone  deposits  of  eastern  Kentucky. 
Eng.  &  Mg.  Jour.,  vol.  73,  pp.  895-896,  2  figs.,  1902. 
Describes  the  geology  of  the  region  and  the  character  of  the  lithographic  stone. 
4.  Fossils  and  age  of  the  Yakutat  formation.     Description  of  collections  made  chiefly 
near  Kadiak,  Alaska. 
Harriman  Alaska  Expedition,  vol.  4,  pp.  125-146,  11  pis..  1904. 
Discusses  the  geologic  age  of  the  Yakutat  formation  from  the  evidence  of  its  fossils  and  gives 
systematic  descriptions  of  these. 
5.  Determination  and  correlation  of  formations  [of  northern  Arkansas]. 
U.  S.  Geol.  Surv.,  Professional  Paper  no.  24,  pp.  90-113,  1904. 
Discusses  the  occurrence,  character,  geologic  relations,  and  correlation  of  Ordovician,  Silurian, 
Devonian,  and  Carboniferous  formations  of  northern  Arkansas. 
6.  Systematic  paleontology  of  the  Miocene  deposits  of  Maryland:  Hydrozoa. 
Md.  Geol.  Surv.,  Miocene,  pp.  433-438,  1  pi.,  1904. 
