FOR    THE    YEARS    1901-1905,   INCLUSIVE.  369 
Williams  (Ira  A.). 
1.  Geology  of  Jasper  County  [Iowa]. 
Iowa  Geol.  Surv.,  vol.  15,  Ann.  Kept.,  1905,  pp.  277-367,  1  pi.,  12  figs.,  2  maps,  1905. 
Describes  physiographic  features,  the  occurrence,  character,  and  relations  of  Carboniferous 
strata  and  Pleistocene  deposits,  and  the  economic  resources. 
2.  The  comparative  accuracy  of  the  methods  for  determining  the  percentages  of  the 
several  components  of  an  igneous  rock. 
Am.  Geol.,  vol.  35,  pp.  34-46,  1905. 
Williams  (I.  A.),  Beyer  (S.  W.)  and. 
1.  Technology  of  clays. 
See  Beyer  (S.  W.)  and  ■Williams  (I.  A.),  1. 
2.  The  geology  of  clays. 
See  Beyer  (S.  W.)  and  "Williams  (I.  A.),  2. 
Willimott  (C.  W.). 
1.  Minerals  of  the  Ottawa  Valley. 
Can.  Geol.  Surv.,  Summ.  Rept.,  for  1904,  pp.  229-232,  1905. 
Describes  the  occurrence  and  characters  of  lepidolite,  serpentine,  and  fuchsite  from  the 
Ottawa  Valley. 
2.  Notes  on  molybdenite. 
Can.  Geol.  Surv.,  Min.  Res.  of  Can.,  Bull,  on  Molybdenum  and  Tungsten,  pp.  15-16,  1904. 
Willis  (Bailey). 
1.  Paleozoic  Appalachia,  or  the  history  of  Maryland  during  Paleozoic  time. 
Md.  Geol.  Surv.,  vol.  4,  pp.  23-93,  12  pis.,  1  fig.,  1902.     [Advance  separate,  1900.] 
Describes  action  of  dynamic  forces  upon  land  surfaces,  and  history  of  orographic  movements 
and  geographic  changes  during  Paleozoic  time  affecting  the  area  in  which  Maryland  is 
situated. 
2.  Individuals  of  stratigraphic  classification. 
Jour.  Geol.,  vol.  9,  pp.  557-569,  1901. 
Discusses  the  discrimination  of  formations  by  lithologic  criteria  and  the  determination  of 
faunal  and  time  divisions. 
3.  Thomas  Benton  Brooks. 
Science,  new  ser.,  vol.  13,  pp.  460-462,  1901. 
Gives  an  account  of  his  life  and  geologic  researches. 
4.  Oil  of  the  northern  Rocky  Mountains. 
Eng.  and  Mg.  Jour.,  vol.  72,  pp.  782-784, 3  figs.,  1901. 
Describes  the  stratigraphy  and  structure  of  the  region  and  the  probable  occurrence  of  oil. 
5.  New  York  City  folio,  New  York-New  Jersey. 
See  Merrill  (F.J.  H.)  and  others,  1. 
6.  Stratigraphy  and  structure,  Lewis  and  Livingston  ranges,  Montana. 
Geol.  Soc.  Am.,  Bull.,  vol.  13,  pp.  305-352,  8  pis.  (inch  map),  6  figs.,  1902. 
Describes  the  physiography,  the  occurrence  and  character  of  the  Algonkian,  Carboniferous, 
Cretaceous  and  Pleistocene  formations,  and  the  geologic  structure  of  the  region. 
7.  Structure  of  the  front  range,  northern  Rocky  Mountains,  Montana. 
Abstract:  Science,  new  ser.,  vol.  15,  pp.  86-87,  1902. 
8.  Physiography  of  the  northern  Rocky  Mountains. 
Abstract:  Science,  new  ser.,  vol.  15,  p.  87,  1902. 
9.  Conditions  of  overthrust  in  the  northern  Rockies. 
Abstract:  Science,  new  ser.,  vol.  15,  p.  507,  1902. 
10.  Mountain  growths  of  the  Great  Plains. 
Abstract:  Science,  new  ser.,  vol.  16,  pp.  1028-1029,  1902. 
11.  Physiography  and  deformation  of  the  Wenatchee-Chelan  District,  Cascade  Range 
[Washington]. 
U.  S.  Geol.  Surv.,  Professional  Paper  no.  19,  pp.  41-97,  13  pis.,  2  figs.,  1903. 
Describes  physiographic  features  of  the  region  and  their  history. 
Bull.  301—06 24 
