302  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
Sellards  (E.  H. )— Continued. 
2.  Fossil  plants  in  the  Permian  of  Kansas. 
Kan.  Acad.  Sci.,  Trans.,  vol.  17,  pp.  208-209,  1901. 
Describes  occurrence  of  the  plant  remains  at  various  localities. 
3.  On  the  fertile  fronds  of  Crossotheca  and  Myriotheca,  and  on  the  spores  of  other 
Carboniferous  ferns  from  Mazon  Creek,  Illinois. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  14,  pp.  195-202,  1902. 
4.  On  the  validity  of  Idiophyllum  rotundifolium  Lesquereux,  a  fossil  plant  from  the 
Coal  Measures  of  Mazon  Creek,  Illinois. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  14,  pp.  203-204,2  figs.,  1902. 
Considers  that  the  characters  of  this  fossil  plant  agree  with  Neuropteris  rarinervis  Bunb.  and 
that  the  genus  Idiophyllum  has  no  standing. 
5.  Some  new  structural  characters  of  Paleozoic  cockroaches. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  15,  pp.  307-315,  2  pis.,  1903. 
Discusses  structural  features  and  immature  stages,  and  describes  several  forms  of  Carboniferous 
cockroaches. 
6.  Codonotheca,  a  new  type  of  spore-bearing  organ  from  the  Coal  Measures. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  16,  pp.  87-95,  1  pi.,  1903. 
7.  Discovery  of  fossil  insects  in  the  Permian  of  Kansas. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  16,  pp.  323-324,  1903. 
8.  A  study  of  the  structure  of  Paleozoic  cockroaches,  with  descriptions  of  new  forms 
from  the  Coal  Measures. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  18,  pp.  113-134,  213-227.  1  pi..  37  figs.,  1904. 
Sellards  (E.  H.),  Beede  (J.  W.)  and. 
1.  Stratigraphy  of  the  eastern  outcrop  of  the  Kansas  Permian. 
See  Beede  (J.  W.)  and  Sellards  (E.  H.),  1 
Shaaf  (Albert),  Price  (J.  A.)  and. 
1.  Spy  Run  and  Poinsett  lake  bottoms. 
See  Price  (J.  A.)  and  Shaaf  (A.),  1. 
2.  Abandoned  meanders  of  Spy  Run  Creek  [Indiana]. 
See  Price  (J.  A.)  and  Shaaf  (A.),  2. 
Shaler  (M.  K.),  Taff  (J.  A.)  and. 
1.  Notes  on  the  geology  of  the  Muscogee  oil  fields,  Indian  Territory. 
See  Taff  (J.  A.)  and  Shaler  (M.  K.),  1. 
Shaler  (N.  S.). 
1.  Broad  valleys  of  the  Cordilleras. 
Geol.  Soc.  Am..  Bull.,  vol.  12,  pp.  271-300,  1901. 
Discusses  the  origin  and  development  of  these  valleys  and  the  bearing  of  the  evidence  on  the 
orographic  features  of  the  region. 
2.  A  comparison  of  the  features  of  the  earth  and  the  moon. 
Smith.  Cont.  Knowl.,  vol.  34,  pp.  1-79,  25  pis.,  1903. 
Sharwood  (W.  J.),  Eakle  (A.  S.)  and. 
1.  Luminescent  zinc-blende. 
See  Eakle  (A.  S.)  and  Sharwood  (W.  J.),  1. 
Shattuck  (C.  H.). 
1.  A  fossil  forest  in  Jackson  County  [Kansas]. 
Kans.  Acad.  Sci.,  Trans.,  vol.  19,  pp.  107-109,  1  pi.,  /  fig.,  1905. 
Describes  the  occurrence  of  fossil  plants  in  the  Carboniferous  of  Jackson  County,  Kansas. 
Shattuck  (George  Burbank). 
1.  The  Pleistocene  problem  of  the  North  Atlantic  coastal  plain. 
Johns  Hopkins  Univ.,  Circular  no.  152,  pp.  69-75,  1901;  Am.  Geol.,  vol.  28,  pp.  87-107,  1901 ; 
Reviews  the  opinions  of  various  writers  on  these  problems  and  gives  the  author's  conclusions, 
2.  Apparent  unconformities  during  periods  of  continuous  sedimentation. 
Abstract:  Science,  new  ser.,  vol,  13,  pp.  99-100,  1901, 
