﻿THE 
  GENUS 
  PENTACRINUS 
  IN 
  ALASKA 
  

  

  Ity 
  Frank 
  Springes 
  

  

  Associate 
  in 
  Paleontology, 
  United 
  States 
  National 
  Museum 
  

  

  In 
  April. 
  1913, 
  Dr. 
  T. 
  W. 
  Stanton, 
  of 
  the 
  United 
  States 
  Geological 
  

   Survey, 
  submitted 
  to 
  me 
  for 
  examination 
  some 
  crinoid 
  remains 
  col- 
  

   lected 
  by 
  field 
  parties 
  of 
  the 
  survey 
  in 
  the 
  extreme 
  northern 
  part 
  of 
  

   Alaska, 
  near 
  the 
  Arctic 
  Ocean. 
  These 
  proved 
  to 
  belong 
  to 
  the 
  true 
  

   Pentacrinus 
  {Extracrinus 
  of 
  Austin, 
  de 
  Loriol, 
  and 
  P. 
  H. 
  Carpen- 
  

   ter) 
  of 
  the 
  lower 
  Jurassic 
  of 
  England 
  and 
  continental 
  Europe, 
  and 
  

   of 
  the 
  type 
  of 
  P. 
  subangularis 
  Miller, 
  from 
  the 
  Lias 
  of 
  Boll. 
  Met- 
  

   zingen, 
  Holzmaden, 
  and 
  other 
  localities 
  in 
  Wurtemburg, 
  Germany. 
  

   I 
  advised 
  Doctor 
  Stanton 
  of 
  this 
  identification 
  in 
  a 
  preliminary 
  re- 
  

   port, 
  which 
  was 
  published. 
  1 
  The 
  occurrence 
  was 
  of 
  much 
  interest 
  

   as 
  the 
  first 
  discover}'- 
  of 
  Pentacrinus, 
  with 
  the 
  exception 
  of 
  isolated 
  

   stem 
  segments, 
  yet 
  made 
  in 
  American 
  rocks, 
  and 
  because 
  these 
  speci- 
  

   mens 
  gave 
  evidence 
  of 
  an 
  unexpectedly 
  wide 
  distribution 
  of 
  one 
  of 
  

   the 
  typical 
  species. 
  A 
  detailed 
  account 
  of 
  the 
  material 
  was 
  deferred 
  

   in 
  the 
  hope 
  of 
  obtaining 
  more 
  complete 
  specimens 
  from 
  one 
  of 
  the 
  

   localities, 
  as 
  it 
  was 
  then 
  expected 
  that 
  Mr. 
  Leffingwell 
  might 
  visit 
  

   the 
  region 
  again. 
  Nothing 
  further 
  has 
  been 
  accomplished, 
  however, 
  

   and 
  it 
  has 
  been 
  thought 
  advisable 
  to 
  proceed 
  with 
  what 
  we 
  have. 
  

  

  The 
  material 
  in 
  hand 
  comes 
  from 
  two 
  localities. 
  The 
  first 
  is 
  on 
  a 
  

   small 
  island 
  called 
  Black 
  Island, 
  in 
  Canning 
  River, 
  opposite 
  Mount 
  

   Copleston, 
  longitude 
  146° 
  20' 
  W., 
  latitude 
  69° 
  30' 
  N.; 
  it 
  is 
  about 
  100 
  

   miles 
  above 
  the 
  mouth 
  of 
  the 
  river 
  where 
  it 
  debouches 
  into 
  the 
  Arctic 
  

   Ocean 
  near 
  Flaxman 
  Point. 
  Here 
  a 
  single 
  specimen 
  was 
  secured, 
  

   consisting 
  of 
  a 
  small 
  slab 
  containing 
  crinoid 
  remains 
  brought 
  from 
  

   the 
  island 
  by 
  a 
  native. 
  It 
  was 
  derived 
  from 
  a 
  formation 
  composed 
  

   of 
  about 
  4,000 
  feet 
  of 
  shale 
  called 
  the 
  Kingak 
  shale, 
  correlated 
  by 
  

   Mr. 
  Leffingwell 
  as 
  of 
  lower 
  Jurassic 
  age. 
  2 
  The 
  specimen 
  consists 
  of 
  

   part 
  of 
  a 
  set 
  of 
  arms 
  of 
  a 
  large 
  individual, 
  probably 
  associated 
  with 
  

   numerous 
  others, 
  in 
  a 
  preservation 
  so 
  exquisite 
  as 
  to 
  induce 
  a 
  strong 
  

   desire 
  to 
  secure 
  further 
  treasures 
  from 
  the 
  locality. 
  Although 
  won- 
  

  

  1 
  Professional 
  Taper 
  109, 
  U. 
  S. 
  Geol. 
  Surv., 
  1919, 
  The 
  Canning 
  River 
  Region, 
  Northern 
  

   Alaska, 
  by 
  Ernest 
  de 
  K. 
  Leffingwell, 
  p. 
  119. 
  

  

  2 
  Idem, 
  p. 
  119. 
  

  

  No. 
  2577. 
  — 
  Proceedings 
  U. 
  S. 
  National 
  Museum, 
  Vol. 
  67, 
  art. 
  5. 
  

  

  22248—25 
  1 
  

  

  