﻿412 
  Richardson 
  — 
  Paleozoic 
  Section 
  in 
  Northern 
  Utah. 
  

  

  talus 
  slopes 
  or 
  debris-covered 
  lowlands 
  so 
  that 
  nowhere 
  was 
  a 
  

   complete 
  exposure 
  of 
  the 
  formation 
  found 
  and 
  only 
  thin 
  beds 
  

   of 
  impure 
  reddish-colored 
  limestone 
  were 
  observed, 
  the 
  strati- 
  

   graphic 
  interval 
  between 
  the 
  underlying 
  Jefferson 
  and 
  over- 
  

   lying 
  Madison 
  limestone 
  being 
  about 
  200 
  feet. 
  This 
  soft 
  

   reddish 
  zone 
  lying 
  between 
  well 
  marked 
  massive 
  limestone 
  is 
  

   an 
  excellent 
  horizon 
  marker. 
  

  

  In 
  the 
  Randolph 
  quadrangle 
  the 
  Threeforks 
  limestone 
  out- 
  

   crops 
  in 
  two 
  distinct 
  areas 
  in 
  Laketown 
  Canyon 
  and 
  in 
  the 
  

   Crawford 
  Mountains 
  but 
  fossils 
  were 
  found 
  in 
  it 
  only 
  in 
  the 
  

   Crawford 
  Mountains, 
  where 
  the 
  following 
  lot, 
  identified 
  by 
  E. 
  

   M. 
  Kindle, 
  was 
  obtained 
  in 
  Si 
  sec. 
  29, 
  T. 
  11 
  JSL, 
  K.8E. 
  

   Productella 
  coloradensis 
  Syringothyris 
  cf. 
  carteri 
  

  

  Camarotoechia 
  cf. 
  contracta 
  Spirifer 
  lohitneyi 
  var. 
  anima- 
  

   /Schizophorta 
  striatula 
  var. 
  sensis 
  

  

  australis 
  Cleiothyridina 
  sp. 
  undet. 
  

  

  Spirifer 
  notabils 
  

  

  Dr. 
  Kindle 
  states 
  that 
  this 
  fauna 
  is 
  of 
  Upper 
  Devonian 
  age 
  and 
  

   includes 
  elements 
  both 
  of 
  the 
  Ouray 
  limestone 
  and 
  Threeforks 
  

   shale 
  fauna. 
  

  

  It 
  may 
  be 
  observed 
  in 
  passing 
  that 
  reddish 
  beds 
  referred 
  to 
  

   by 
  Blackwelder 
  as 
  constituting 
  a 
  " 
  non-marine 
  member 
  in 
  the 
  

   Mississippian 
  limestone" 
  * 
  exposed 
  around 
  the 
  sources 
  of 
  the 
  

   south 
  fork 
  of 
  Ogden 
  River, 
  Utah, 
  and 
  thought 
  by 
  him 
  to 
  be 
  

   of 
  continental 
  origin, 
  may 
  prove 
  to 
  be 
  the 
  marine 
  Threeforks. 
  

  

  Carboniferous. 
  

   The 
  Carboniferous 
  rocks 
  of 
  the 
  area 
  under 
  consideration 
  

   outcrop 
  in 
  the 
  Crawford 
  Mountains 
  east 
  of 
  the 
  town 
  of 
  Ran- 
  

   dolph, 
  where 
  the 
  entire 
  local 
  section 
  is 
  well 
  exposed. 
  

  

  Mississippian 
  Series. 
  

   Madison 
  limestone. 
  

   The 
  Threeforks 
  limestone 
  is 
  apparently 
  conformably 
  over- 
  

   lain 
  by 
  the 
  well 
  known 
  Madison 
  limestone, 
  which 
  here 
  is 
  a 
  

   medium 
  to 
  thin-bedded 
  dark 
  limestone 
  of 
  variable 
  thickness 
  

   ranging 
  from 
  about 
  600 
  to 
  4600 
  feet 
  thick. 
  It 
  is 
  abundantly 
  

   fossiliferous. 
  The 
  following 
  small 
  selected 
  list 
  was 
  identified, 
  

   and 
  in 
  part 
  collected, 
  by 
  G. 
  H. 
  Girty 
  : 
  

  

  Fossils 
  from 
  Madison 
  limestone, 
  Randolph 
  quadrangle 
  : 
  

  

  Menophyllum 
  excavatum 
  P. 
  gallatinensis 
  

  

  Leptama 
  analog 
  a 
  Camarotoechia 
  herrickana 
  

  

  Schuchertella 
  chemungensis 
  Spirifer 
  centronatns 
  

  

  Productella 
  concentrica 
  Reticularia 
  Cooperensis 
  

  

  P. 
  arcuata 
  Syringothyris 
  carteri 
  

  

  Productus 
  levicosta 
  JEuomphalus 
  utahensis 
  

  

  * 
  Blackwelder, 
  Eliot. 
  : 
  New 
  Light 
  on 
  the 
  Geology 
  of 
  the 
  Wasatch 
  Mts., 
  

   Bull. 
  Geol. 
  Soc. 
  America, 
  vol. 
  xxi, 
  pp. 
  528, 
  529, 
  1910. 
  

  

  