﻿408 
  Richardson 
  — 
  Paleozoic 
  Section 
  in 
  Northern 
  Utah. 
  

  

  The 
  "Worm 
  Creek 
  quartzite 
  member 
  of 
  the 
  St. 
  Charles 
  lime- 
  

   stone 
  is 
  a 
  massive 
  gray 
  quartzite 
  occurring 
  at 
  the 
  base 
  of 
  the 
  

   formation. 
  It 
  is 
  of 
  variable 
  thickness, 
  having 
  a 
  maximum 
  of 
  

   300 
  feet 
  in 
  the 
  Randolph 
  quadrangle. 
  The 
  Worm 
  Creek 
  

   quartzite 
  directly 
  overlies 
  the 
  JSTounan 
  limestone 
  and 
  is 
  

   succeeded 
  by 
  the 
  massive 
  gray 
  fossiliferous 
  Upper 
  Cambrian 
  

   limestone 
  which 
  forms 
  the 
  bulk 
  of 
  the 
  St. 
  Charles 
  limestone. 
  

   The 
  name 
  is 
  derived 
  from 
  "Worm 
  Creek, 
  in 
  the 
  Bear 
  River 
  

   Range, 
  10 
  miles 
  north 
  of 
  the 
  Randolph 
  quadrangle. 
  

  

  Ordovician. 
  

  

  Overlying 
  this 
  great 
  thickness 
  of 
  Cambrian 
  rocks 
  the 
  Ordovi- 
  

   cian 
  system 
  likewise 
  is 
  well 
  developed 
  in 
  the 
  Bear 
  River 
  

   Range, 
  notably 
  adjacent 
  to 
  the 
  Idaho-Utah 
  state 
  boundary, 
  

   where 
  it 
  is 
  represented 
  by 
  a 
  continuous 
  exposure 
  of 
  2,000 
  feet 
  

   of 
  strata. 
  These 
  beds 
  are 
  separated 
  into 
  the 
  following 
  forma- 
  

   tions 
  : 
  the 
  Garden 
  City 
  limestone 
  containing 
  a 
  Beekmantown 
  

   fauna, 
  the 
  Swan 
  Peak 
  quartzite 
  containing 
  a 
  Chazy 
  ? 
  fauna, 
  and 
  

   the 
  Fish 
  Haven 
  limestone 
  characterized 
  by 
  a 
  Richmond 
  fauna. 
  

   Although 
  the 
  succession 
  is 
  apparently 
  conformable, 
  there 
  is 
  

   nevertheless 
  evidence 
  of 
  erosional 
  unconformity 
  at 
  the 
  base 
  of 
  

   the 
  lowermost 
  and 
  uppermost 
  Ordovician 
  formations. 
  These 
  

   unconformities 
  are 
  inferred 
  from 
  the 
  facts 
  that 
  the 
  Garden 
  

   City 
  limestone 
  and 
  the 
  ,Fish 
  Haven 
  dolomite, 
  respectively, 
  rest 
  

   on 
  such 
  different 
  horizons 
  in 
  different 
  parts 
  of 
  the 
  Randolph 
  

   quadrangle 
  that 
  considerable 
  erosion 
  apparently 
  preceded 
  their 
  

   deposition. 
  Details 
  will 
  be 
  given 
  in 
  the 
  Randolph 
  folio. 
  

  

  Garden 
  City 
  Limestone. 
  

  

  The 
  Garden 
  City 
  limestone, 
  named 
  from 
  Garden 
  City 
  Can- 
  

   yon, 
  a 
  tributary 
  of 
  Bear 
  Lake, 
  consists 
  of 
  a 
  succession 
  of 
  thick 
  

   and 
  thin 
  bedded 
  gray 
  limestone 
  approximately 
  1,000 
  feet 
  

   thick. 
  A 
  characteristic 
  feature 
  is 
  the 
  presence 
  throughout 
  the 
  

   formation 
  of 
  a 
  conglomerate 
  or 
  breccia 
  consisting 
  of 
  elongated 
  

   bits 
  of 
  limestone 
  up 
  to 
  2 
  or 
  3 
  inches 
  in 
  length, 
  irregularly 
  

   imbedded 
  in 
  a 
  matrix 
  of 
  similar 
  composition. 
  

  

  The 
  following 
  fossils, 
  identified 
  by 
  Edwin 
  Kirk 
  of 
  the 
  U. 
  S. 
  

   Geological 
  Survey, 
  were 
  obtained 
  from 
  the 
  Garden 
  City 
  lime- 
  

   stone 
  in 
  the 
  Bear 
  River 
  Range, 
  Randolph 
  quadrangle, 
  at 
  the 
  

   horizons 
  indicated 
  : 
  

  

  From 
  the 
  eastern 
  flank 
  of 
  Bear 
  River 
  Range 
  4 
  miles 
  northwest 
  

   of 
  Garden 
  City, 
  Utah 
  — 
  

  

  From 
  the 
  base 
  of 
  the 
  Garden 
  City 
  limestone, 
  within 
  25 
  feet 
  of 
  

   St. 
  Charles 
  limestone: 
  

  

  Dalmanella 
  sp. 
  Raphistoma 
  acuta 
  H. 
  & 
  W. 
  

  

  Syntrophia 
  near 
  calcifera 
  Hormotoma 
  sp. 
  

  

  Billings 
  Eccyliopterus 
  sp. 
  

  

  