﻿T. 
  M. 
  Dale 
  — 
  Ordovician 
  Outlier 
  at 
  Hyde 
  Manor. 
  395 
  

  

  Art. 
  XXXYI. 
  — 
  The 
  Ordovician 
  Outlier 
  at 
  Hyde 
  Manor 
  in 
  

   Sudbury, 
  Vermont 
  (second 
  paper) 
  ; 
  by 
  T. 
  Nelson 
  Dale.* 
  

  

  Since 
  the 
  publication 
  of 
  the 
  former 
  paper 
  on 
  this 
  subject 
  f 
  

   further 
  excavations 
  and 
  core 
  drilling 
  have 
  thrown 
  still 
  more 
  

   light 
  on 
  the 
  areal 
  and 
  structural 
  relations 
  of 
  the 
  outlier. 
  These 
  

   later 
  results, 
  together 
  with 
  the 
  former, 
  are 
  embodied 
  in 
  the 
  

   map 
  and 
  section, 
  jig. 
  1. 
  

  

  A 
  series 
  of 
  holes 
  (excav. 
  10, 
  11, 
  12) 
  was 
  dug 
  across 
  the 
  sag 
  

   in 
  the 
  surface 
  west 
  of 
  the 
  outlier, 
  and 
  the 
  location 
  of 
  the 
  bound- 
  

   ary 
  between 
  the 
  Cambrian 
  schist 
  mass 
  and 
  the 
  Ordovician 
  fos- 
  

   siliferous 
  limestone 
  west 
  of 
  it 
  was 
  fixed 
  withiu 
  five 
  feet. 
  

  

  Other 
  excavations 
  (13, 
  14) 
  showed 
  that 
  what 
  had 
  been 
  taken 
  

   for 
  a 
  minor 
  fold 
  in 
  the 
  main 
  Ordovician 
  mass 
  was 
  really 
  the 
  

   end 
  of 
  a 
  limestone 
  lens, 
  41-42 
  ft. 
  long 
  and 
  up 
  to 
  5 
  ft. 
  thick, 
  

   lying 
  in 
  the 
  Cambrian 
  schist 
  and 
  at 
  one 
  point 
  with 
  an 
  inch 
  or 
  

   two 
  of 
  the 
  schist 
  actually 
  overlying 
  it. 
  Whether 
  this 
  over- 
  

   lying 
  schist 
  got 
  there 
  by 
  deposition 
  or 
  by 
  " 
  creep 
  " 
  after 
  the 
  

   solution 
  of 
  the 
  limestone 
  could 
  not 
  be 
  ascertained. 
  Then 
  

   another 
  limestone 
  lens, 
  about 
  7 
  feet 
  long, 
  was 
  found 
  a 
  little 
  

   west 
  and 
  south 
  of 
  the 
  other. 
  The 
  age 
  of 
  these 
  lenses 
  is 
  not 
  

   determined 
  ; 
  but 
  they 
  are 
  probably 
  contemporaneous 
  with 
  the 
  

   schist 
  and 
  thus 
  Cambrian. 
  

  

  A 
  small 
  excavation 
  at 
  the 
  southern 
  apex 
  of 
  the 
  outlier 
  

   (excav. 
  15) 
  shows 
  that 
  the 
  limestone 
  there 
  pitches 
  southward 
  

   under 
  the 
  schist, 
  the 
  foliation 
  of 
  the 
  schist 
  which 
  the 
  micro- 
  

   scope 
  shows 
  to 
  be 
  bedding, 
  conforming 
  to 
  the 
  limestone 
  surface 
  

   east 
  of 
  the 
  point 
  but 
  running 
  up 
  against 
  it 
  on 
  the 
  west 
  for 
  

   at 
  least 
  a 
  foot 
  north. 
  A 
  woodchu.ck's 
  burrow 
  a 
  little 
  north 
  of 
  

   the 
  apex 
  has 
  schist 
  fragments 
  about 
  it 
  brought 
  up 
  from 
  next 
  to 
  

   the 
  limestone. 
  

  

  Hand-specimens 
  of 
  the 
  limestone 
  from 
  next 
  to 
  the 
  drill 
  hole 
  

   of 
  1911 
  show 
  two 
  foliations, 
  one 
  dipping 
  30° 
  about 
  E.SE., 
  and 
  

   the 
  other, 
  marked 
  by 
  sharply 
  undulating 
  and 
  faulted 
  calcite 
  

   laminae, 
  dipping 
  55° 
  E.SE. 
  A 
  thin 
  section 
  shows 
  that 
  the 
  first 
  

   of 
  these 
  foliations 
  consists 
  of 
  undulating 
  laminae 
  of 
  extremely 
  

   fine 
  particles 
  (probably 
  dolomite) 
  alternating 
  with 
  laminae 
  of 
  

   coarser 
  particles, 
  probably 
  calcite, 
  containing 
  here 
  and 
  there 
  

   large 
  calcite 
  grains. 
  The 
  section 
  also 
  shows 
  quartz 
  grains 
  dis- 
  

   tributed 
  along 
  this 
  foliation. 
  The 
  second 
  foliation, 
  consisting 
  

   of 
  coarse 
  calcite 
  laminae, 
  in 
  sharp 
  folds 
  and 
  faulted, 
  breaks 
  

   across 
  the 
  first 
  and 
  seems 
  to 
  be 
  secondary. 
  Both 
  foliations 
  are 
  

   shown 
  on 
  the 
  map 
  at 
  this 
  point 
  but 
  with 
  the 
  same 
  strike, 
  which 
  

   may 
  not 
  be 
  exact. 
  A 
  thin 
  section 
  of 
  the 
  limestone 
  at 
  the 
  

   southern 
  apex 
  shows 
  that 
  the 
  foliation 
  there 
  which 
  strikes 
  N. 
  

  

  * 
  Published 
  by 
  permission 
  of 
  the 
  Director 
  of 
  the 
  U. 
  S. 
  Geol. 
  Survey, 
  

   f 
  This 
  Journal, 
  vol. 
  xxxiii, 
  pp. 
  97-102, 
  Feb. 
  1912. 
  

  

  Am. 
  Jour. 
  Sci.— 
  Fourth 
  Series, 
  Vol. 
  XXXVI, 
  No. 
  214.— 
  October, 
  1913. 
  

   26 
  

  

  