﻿44 
  JOURNAL 
  OF 
  THB 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIFNCFS 
  VOL. 
  12, 
  NO. 
  2 
  

  

  doubt 
  the 
  outstanding 
  feature 
  of 
  interest 
  was 
  the 
  astonishing 
  number 
  of 
  

   ducks 
  that 
  frequented 
  the 
  Potomac 
  River. 
  The 
  species 
  most 
  abundant 
  were 
  

  

  Marila 
  marila, 
  Marila 
  affinis, 
  Anas 
  ruhripes, 
  and 
  Glaucionetta 
  dangula 
  

   americana. 
  Flocks 
  of 
  geese, 
  Branta 
  canadensis 
  canadensis, 
  and 
  swans, 
  

   Olor 
  cohinibianus, 
  were 
  also 
  present. 
  H. 
  C. 
  O. 
  

  

  ORNITHOLOGY. 
  — 
  Birds 
  of 
  the 
  Clear 
  Creek 
  District, 
  Colorado. 
  F. 
  C. 
  

   Lincoln. 
  Auk 
  37: 
  607. 
  1920. 
  

   Systematic 
  investigations 
  in 
  the 
  region 
  about 
  Clear 
  Creek 
  near 
  Denver, 
  

   Colorado, 
  during 
  a 
  period 
  of 
  five 
  years 
  have 
  resulted 
  in 
  a 
  list 
  of 
  182 
  birds, 
  

   including 
  a 
  number 
  of 
  rare 
  species. 
  ' 
  H. 
  C. 
  Oberholser. 
  

  

  ORNITHOLOGY. 
  — 
  Relative 
  abundance 
  of 
  wild 
  ducks 
  at 
  Delavan, 
  Wisconsin. 
  

   N. 
  HoLLisTER. 
  Auk 
  37: 
  367-371. 
  1920. 
  

   Records 
  of 
  ducks 
  obtained 
  at 
  Delavan, 
  Wisconsin, 
  during 
  the 
  years 
  1892 
  

   to 
  1899 
  give 
  an 
  interesting 
  indication 
  of 
  the 
  relative 
  abundance 
  of 
  species 
  

   during 
  that 
  period. 
  A 
  list 
  is 
  given 
  showing 
  the 
  species 
  observed 
  in 
  the 
  order 
  

   of 
  their 
  abundance. 
  H. 
  C. 
  OberholsER. 
  

  

  ORNITHOLOGY. 
  — 
  Four 
  new 
  birds 
  from 
  the 
  Philippines 
  and 
  Greater 
  Sunda 
  

   Islands. 
  J. 
  H. 
  Riley. 
  Proc. 
  Biol. 
  Soc. 
  Wash. 
  33: 
  55-58. 
  1920. 
  

   The 
  following 
  subspecies 
  of 
  East 
  Indian 
  birds 
  are 
  described: 
  Anthreptes 
  

   malacensis 
  paraguae, 
  from 
  Palawan, 
  Philippine 
  Islands, 
  A. 
  m. 
  bornensis, 
  from 
  

   British 
  North 
  Borneo; 
  Enodes 
  erythrophrys 
  centralis, 
  from 
  Celebes; 
  and 
  

   Munia 
  punctulata 
  particeps, 
  from 
  Celebes. 
  H. 
  C. 
  Oberholser. 
  

  

  GEOLOGY. 
  — 
  Oil 
  prospects 
  in 
  Washington 
  County, 
  Utah. 
  Harvey 
  BasslER 
  

   and 
  John 
  B. 
  Reeside, 
  Jr. 
  U. 
  S. 
  Geol. 
  Surv. 
  Bull. 
  726-C. 
  Pp. 
  87-107. 
  

   1921. 
  

  

  Washington 
  County, 
  in 
  extreme 
  southwestern 
  Utah, 
  is 
  drained 
  by 
  Virgin 
  

   River, 
  one 
  of 
  the 
  larger 
  tributaries 
  of 
  the 
  Colorado. 
  Exploratory 
  drilling 
  

   for 
  oil 
  has 
  not 
  been 
  extensive 
  in 
  Washington 
  County. 
  Drilling 
  near 
  Virgin 
  

   City 
  resulted 
  in 
  several 
  small 
  wells 
  as 
  early 
  as 
  1907. 
  

  

  The 
  rocks 
  of 
  the 
  region 
  range 
  in 
  age 
  from 
  Mississippian 
  to 
  Tertiary, 
  but 
  

   those 
  of 
  greatest 
  importance 
  as 
  possible 
  sources 
  of 
  oil 
  are 
  the 
  older 
  rocks, 
  

   beneath 
  what 
  is 
  known 
  as 
  the 
  Shinarump 
  conglomerate. 
  These 
  older 
  rocks 
  

   are 
  included 
  in 
  the 
  Moenkopi 
  formation, 
  the 
  Kaibab 
  limestone, 
  and 
  a 
  sand- 
  

   stone 
  formation 
  which 
  represents 
  the 
  Coconino 
  sandstone 
  and 
  Supai 
  formation 
  

   of 
  the 
  Grand 
  Canyon 
  area. 
  

  

  The 
  region 
  may 
  be 
  considered 
  structurally 
  as 
  two 
  districts 
  separated 
  

   by 
  the 
  Hurricane 
  fault, 
  which 
  runs 
  north 
  and 
  south 
  on 
  a 
  line 
  15 
  miles 
  east 
  

   of 
  St. 
  George. 
  East 
  of 
  the 
  fault 
  the 
  rocks 
  are 
  relatively 
  little 
  disturbed. 
  

   Some 
  smaller 
  faults 
  and 
  some 
  low 
  anticlines 
  are 
  present, 
  but 
  as 
  a 
  whole 
  the 
  

   district 
  is 
  one 
  of 
  low 
  monoclinal 
  dips 
  without 
  any 
  large 
  modifications. 
  West 
  

   of 
  the 
  Hurricane 
  fault 
  folds 
  and 
  smaller 
  faults 
  of 
  various 
  sizes 
  have 
  so 
  greatly 
  

   changed 
  the 
  original 
  attitude 
  of 
  the 
  rocks 
  that 
  the 
  district 
  is 
  structurally 
  

   complex 
  in 
  comparison 
  with 
  that 
  east 
  of 
  the 
  fault. 
  

  

  Nothing 
  more 
  was 
  done 
  in 
  the 
  field 
  near 
  Virgin 
  City 
  east 
  of 
  the 
  Hurricane 
  

   fault 
  until 
  1918, 
  when 
  the 
  three 
  producing 
  wells 
  were 
  cleaned 
  out 
  and 
  shot, 
  

   pumping 
  was 
  started, 
  and 
  a 
  small 
  local 
  refinery 
  was 
  built. 
  A 
  new 
  well 
  was 
  

   drilled 
  near 
  the 
  old 
  wells 
  and 
  has 
  a 
  production 
  of 
  4 
  or 
  5 
  barrels 
  a 
  day. 
  The 
  

   total 
  production 
  from 
  the 
  four 
  wells, 
  which 
  are 
  uncased 
  holes 
  550 
  to 
  600 
  feet 
  

  

  