FOR    THE    YEARS    1901-1905,   INCLUSIVE.  271 
Pirsson  (Louis  V.),  Weed  (Walter  H.)  and. 
1.  Missourite,  a  new  leucite  rock  from  the  High  wood  Mountains  of  Montana. 
See  "Weed  (Walter  H.)  and  Pirsson  (Louis  V.),  1. 
2.  Geology  of  the  Shonkin  Sag  and  Palisade  Butte  laccoliths  in  the  Highwood  Moun- 
tains of  Montana. 
See  Weed  (W.  H.)  and  Pirsson  (L.  V. ),  2. 
Plotts  (William). 
1.   Origin  of  petroleum,  coal,  etc.;  being  an  expert  treatise  on  the  actual  occurrence 
of  those  products  in  strata  of  the  earth  crust. 
Whittier,  California,  1905.     29  pp.     [Private  publication.] 
Discusses  the  occurrence  of  petroleum  and  coal,  and  the  reasons  therefor. 
Plumb  (Carlton  H.). 
1.  The  Tercio  coal  mining  district,  Colorado. 
Drury  Coll..  Bradley  Geol.  Field  Station,  Bull.,  vol.  1,  pp.  94-100,  1905. 
Contains  notes  on  the  occurrence  and  character  of  the  coal  seams. 
Pompeckj  (J.  F. ). 
1.  Jura-fossilien  aus  Alaska. 
Kais.  Buss.  Mineralog.  Gesell.,  St.  Petersburg,  Verb.,  ser.  2,  Band.  38,  pp.  239-282,  3  pis.,  1900. 
Abstract:  Am.  Nat.,  vol.  35,  pp.  420-421,  1901. 
Poole  (Henry  S.). 
1.  Stigmaria  structure. 
NovaScotian  Inst.  Sci.,  Trans.,  vol.  10.  pp.  345-347.  2  pis..  1902. 
2.  The  coal-fields  of  New  Brunswick,  Canada. 
Inst.  Mg.  Engrs.   [England],  Trans.,  vol.  23,  pp.  40-47.  1902. 
Discusses  the  geologic  occurrence  of  coal  in  this  area. 
3.  The  coal  problem  in  New  Brunswick. 
Can.  Geol.Surv.,  Snmm.  Kept,  for  1901,  pp.  204-206,  1902. 
Discusses  possibilities  of  coal  production  in  the  province. 
4.  Notes  on  Dr.  Ami's   paper  on    Dictyonema  slates  of   Angus  Brook,  New  Canaan, 
and  Kentville,  N.  S. 
NovaScotian  [nst.  Sci.,  Proc.  &  Trans.,  vol.  10,  pp    151-454,  190:;. 
5.  Notes  on  the  geology  of  Anthracite,  Alberta. 
Can.  Geol.  Snrv.,  Summ.  Kept,  lor  1902    pp.  147-149,  1903. 
Describes  geologic  features  developed  by  the  coal  mining  operations. 
6.  The  Carboniferous  rocks  of  Chignecto  Bay. 
Can.  Geol    Snrv..  Summ.  Kept,  for  1902,  pp.  377-382,  1903. 
Describes  results  of  geologic  examination  of  the  Carboniferous  area  of  this  region. 
7.  A  submerged  tributary  to  the  great  pre-Glacial  river  of  the  Gulf  of  St.  Lawrence. 
Can.  hoy.  Soc  .  Proc.  &  Trans..  2d  ser..  vol.  9.  sect.  4.  pp  14:i-147.  1  tig..  1903. 
8.  Report  on  the  coal  prospects  of  New  Brunswick. 
Can.  Geol.  Surv.,  Ann.  Kept.,  new  ser.,  vol.  L3,  26  pp..  1903. 
Describes  the  geologic  structure  of  the  Carboniferous  held  in  New  Brunswick,  its  correlation 
with  that  of  Nova  Scotia,  and  the  probable  location  of  coal  beds  and  their  character.     In  an 
appendix  gives  detaded  records  of  borings. 
9.  A  trip  to  West  Virginia. 
Nova  Scotia  Mg.  Soc..  hair.,  vol.  8,  pp.  127-131,  1904. 
Includes  observations  upon  the  coals  ami  coal  fields  of  West  Virginia. 
10.  Report  on  the  Pictou  coal  field  of  Nova  Scotia. 
Can.  Geol.  Snrv.,  Ann.  Kept.,  vol.  14,  pt.  M,  38  pp..  1  map,  1904. 
Describes  the  structure  and  stratigraphy  of  the  field,  and  the  occurrence  and  character  of  the 
coal  seams,  and  the  mining  operations. 
