162  BIBLIOGKAPHY    OF    NOETH    AMERICAN    GEOLOGY 
Hershey  (Oscar  H.). 
1.  Peneplains  of  the  Ozark  Highlands. 
Am.  Geol.,  vol.  27,  pp.  25-41,  1901. 
Describes- the  Cretaceous  and  Tertiary  peneplains,  the  Lafayette  baselevel,  the  Ozarkian 
valleys  and  the  modern  valleys. 
2.  Metamorphic  formations  of  northwestern  California. 
Am.  Geol.,  vol.  27,  pp.  225-245,  1901. 
Describes  the  character,  occurrence,  and  distribution  of  the  pre-Cretaceous  rocks  of  the 
Klamath  Mountains. 
3.  On  the  age  of  certain  granites  in  the  Klamath  Mountains. 
Am.  Geol.,  vol.  27,  pp.  258-259,  1901. 
Brief  discussion  of  the  geology  of  the  region  and  of  the  intrusive  origin  of  the  granite. 
4.  The  age  of  the  Kansan  drift  sheet. 
Am.  Geol.,  vol.  28,  pp.  20-25,  1901. 
Describes  the  occurrence  of  the  Kansan  drift  in  Missouri  and  discusses  its  age. 
5.  The  geology  of  the  central  portion  of  the  Isthmus  of  Panama. 
Univ.  of  Cal.,  Dept.  of  Geol.,  Bull.,  vol.  2,  pp.  231-267,  and  map,  1901. 
Describes  the  physiographic  features  and  the  occurrence  and  character  <  >t  several  formations. 
Discusses  the  relations  of  the  crust  movements  of  the  region. 
6.  On  the  age  of  certain  granites  in  the  Klamath  Mountains  [California]. 
Abstract:  Jour.  Geol.,  vol.  9,  pp.  76-77,  1901;  Geol.  Soc.  Am.,  Bull.,  vol.  12,  p.  501,  1901. 
Contains  notes  on  the  occurrence  of  the  granites  and  on  the  geologic  history  of  the  region. 
7.  An  unusual  type  of  auriferous  deposit. 
Science,  new  ser.,  vol.  13,  pp.  869-871.  1901. 
Describes  occurrence  of  gold  in  a  semidecomposed  rock  mass  in  California  and  discusses  the 
mode  of  deposition  of  the  gold. 
8.  The  significance  of  the  term  Sierran. 
Am.  Geol..  vol.  29,  pp.  88-95,  1902. 
Discusses  the  recent  earth  movements  in  the  Sierra  Nevada  region  and  the  use  of  the  terms 
Ozarkian  and  Sierran.     . 
9.  Some  crystalline  rocks  of  Southern  ( ialifornia. 
Am.  Geol.,  vol.  29,  pp.  273-290,  1902. 
Describes  the  character,  occurrence,  and  distribution  of  probable  pre-Paleozpic  crystalline 
granites,  schists,  etc.,  and  of  certain  quartzite  and  limestone  strata  in  this  region. 
10.  Some  Tertiary  formations  of  Southern  ( lalifornia. 
Am.  Geol.,  vol.  29,  pp.  349-372,  1902. 
Describes  volcanic  and  sedimentary  beds  of  the  region. 
11.  The  significance  of  certain  Cretaceous  outliers  in  the  Klamath  region,  California. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  14,  pp.  33-37,  1902. 
Describes  the  occurrence  and  character  of  the  Cretaceous  sediment  and  the  geological  history 
of  this  region. 
12.  Boston  Mountain  physiography. 
Jour.  Geol.,  vol.  10,  pp.  160-165,  1902. 
Discusses  topographic  development  of  west  central  Arkansas  and  reviews  a  paper  by  A.  H. 
Purdue  on  "Physiography  of  the  Boston  Mountain.  Arkansas." 
13.  Neocene  deposits  of  the  Klamath  region,  California. 
Jour.  Geol.,  vol.  10,  pp.  377-392,  1902. 
Describes  the  occurrence  of  these  deposits  and    the   conditions  under   which   they   were 
accumulated. 
14.  The  Quaternary  of  Southern  California. 
Univ.  Cal.,  Dept.  Geol.,  Bull.,  vol.  3,  pp.  1-30,  1  pi.,  1902. 
Describes  orographic  movements,  erosion  phenomena,  and  deposits  of  Quaternary  time  in  this 
region. 
15.  A  supposed  early  Tertiary  peneplain  in  the  Klamath  region,  California. 
Science,  new  ser.,  vol.  15,  pp.  951-954,  1902. 
Discusses  the  evidences  for  the  ancient  peneplain  character  of  the  region  and  the  date  of  forma- 
tion of  the  peneplain. 
