﻿144 
  Williams 
  — 
  Devonian 
  Interval 
  in 
  northern 
  Arkansas. 
  

  

  characteristic 
  of 
  the 
  Sylaraore 
  sandstone, 
  and 
  if 
  this 
  be 
  a 
  cor- 
  

   rect 
  inference, 
  a 
  reason 
  is 
  apparent 
  for 
  the 
  distribution 
  of 
  the 
  

   Sjlamore 
  sandstone 
  over 
  surfaces 
  which 
  had 
  not 
  eroded 
  so 
  far 
  

   down 
  as 
  this 
  rock 
  ; 
  since 
  the 
  place 
  of 
  sedimentation 
  would 
  not 
  

   be 
  the 
  same 
  with 
  the 
  place 
  of 
  erosion 
  from 
  which 
  the 
  materials 
  

   were 
  derived. 
  

  

  Further 
  south, 
  in 
  the 
  northeast 
  corner 
  of 
  AYashington 
  

   County, 
  Arkansas, 
  specimens 
  have 
  been 
  obtained 
  containing 
  a 
  

   few 
  indistinct 
  fossils 
  which 
  are 
  important 
  in 
  interpreting 
  the 
  

   age 
  of 
  this 
  interval-deposit. 
  

  

  No. 
  1279. 
  War 
  Eagle 
  Creek, 
  Washington 
  Co., 
  T. 
  18 
  N., 
  

   K. 
  28 
  W., 
  Sect. 
  15. 
  

  

  The 
  materials 
  were 
  collected 
  by 
  Mr. 
  Weller, 
  and 
  the 
  section 
  

   is 
  described 
  as 
  a 
  bed 
  of 
  black 
  shale 
  (1279 
  A') 
  with 
  very 
  little 
  

   iron 
  pyrites, 
  containing 
  fossils, 
  followed 
  immediately 
  by 
  a 
  red- 
  

   dish-gray 
  limestone 
  (1279 
  A2) 
  containing 
  crinoid 
  stems, 
  but 
  no 
  

   distinct 
  fossils. 
  On 
  the 
  opposite 
  bank, 
  the 
  black 
  shale 
  was 
  

   found 
  to 
  be 
  about 
  30 
  feet 
  thick, 
  but 
  no 
  fossils 
  were 
  discovered 
  

   in 
  it. 
  The 
  underlying 
  rock 
  was 
  not 
  seen. 
  According 
  to 
  the 
  

   map 
  and 
  descriptions 
  given 
  by 
  Prof. 
  Simonds," 
  this 
  is 
  the 
  

   Eureka 
  shale 
  underlying 
  the 
  Boone 
  chert 
  and 
  limestone. 
  The 
  

   fossils 
  are 
  in 
  imperfect, 
  frail 
  and 
  crushed 
  condition, 
  but 
  have 
  a 
  

   decidedly 
  Carboniferous 
  aspect. 
  They 
  also 
  appear 
  to 
  belong 
  

   to 
  the 
  same 
  fauna, 
  discovered 
  in 
  tlie 
  greenish 
  shale 
  (1410 
  M2) 
  

   into 
  which 
  the 
  black 
  shale 
  of 
  Eureka 
  springs 
  gradually 
  merges 
  

   before 
  reaching 
  the 
  limestone 
  above. 
  

  

  Three 
  small 
  collections 
  from 
  Newton 
  County 
  (1291 
  A, 
  B 
  

   and 
  C) 
  indicate 
  the 
  same 
  fauna 
  in 
  greenish 
  shale, 
  and 
  the 
  

   several, 
  together, 
  present 
  unmistakable 
  evidence 
  of 
  the 
  Chou- 
  

   teau 
  fauna 
  of 
  the 
  regions 
  further 
  north 
  in 
  Missouri. 
  

   No. 
  1291. 
  Buffalo 
  Fork, 
  Newton 
  Co. 
  

  

  The 
  materials 
  from 
  this 
  region 
  were 
  collected 
  by 
  Mr. 
  G. 
  H. 
  

   Ashley, 
  and 
  the 
  localities 
  are 
  defined 
  as 
  follows, 
  viz 
  : 
  

  

  1291 
  A. 
  Eureka 
  shale, 
  from 
  N.W. 
  quarter 
  to 
  S.W. 
  quarter, 
  of 
  sec- 
  

   tion 
  T. 
  17 
  N., 
  K 
  21 
  W. 
  

  

  1291 
  B. 
  At 
  base 
  of 
  St. 
  Joe 
  marble, 
  probably; 
  4 
  miles 
  south 
  of 
  

   Jasper, 
  in 
  Henson 
  Creek, 
  one 
  mile 
  above 
  mouth 
  of 
  

   Panther 
  Creek, 
  S.E., 
  of 
  N,W., 
  Sect. 
  1, 
  15 
  N., 
  22 
  W. 
  

  

  1291 
  C. 
  In 
  shale 
  on 
  top 
  of 
  Saccharoidal 
  sandstone, 
  N. 
  4, 
  of 
  S.W. 
  , 
  

   Sect. 
  9, 
  16 
  N., 
  22 
  W. 
  

  

  The 
  fauna 
  of 
  the 
  interval-filing 
  material. 
  — 
  Although 
  the 
  

   fossils, 
  obtained 
  from 
  the 
  black 
  shales, 
  the 
  greenish 
  shales 
  

   following 
  them, 
  and 
  the 
  nodules 
  contained 
  in 
  the 
  black 
  shales, 
  are 
  

   very 
  rare, 
  imperfect 
  and 
  frail 
  ; 
  a 
  careful 
  study 
  of 
  the 
  material 
  has 
  

  

  *Ark. 
  Geol. 
  Survey, 
  Ann. 
  Kept, 
  1888, 
  vol. 
  iv, 
  Washiogton 
  County, 
  by 
  F. 
  W. 
  

   Simonds. 
  

  

  