﻿Mudge 
  — 
  Mouth 
  of 
  Grand 
  River. 
  

  

  33 
  

  

  In 
  the 
  days 
  of 
  the 
  glacial 
  outlet 
  there 
  appears 
  to 
  have 
  been 
  

   here 
  a 
  small 
  embajment, 
  half 
  a 
  mile 
  or 
  more 
  in 
  extent 
  in 
  either 
  

   direction. 
  This 
  embayment 
  and 
  the 
  terraces 
  now 
  existing 
  

   within 
  it 
  are 
  indicated 
  on 
  the 
  accompanying 
  map. 
  The 
  heavy 
  

   broken 
  line 
  indicates 
  the 
  bluff 
  margin 
  of 
  the 
  main 
  valley 
  and 
  

   the 
  embayment. 
  From 
  the 
  high 
  ground 
  at 
  B 
  one 
  descends 
  

   abruptly 
  to 
  the 
  terrace 
  C. 
  This 
  is 
  perhaps 
  the 
  most 
  important 
  

   of 
  the 
  series. 
  Its 
  elevation 
  has 
  not 
  been 
  measured, 
  but 
  it 
  may 
  

   be 
  said 
  roughly 
  to 
  occupy 
  a 
  place 
  about 
  midway 
  between 
  the 
  

   top 
  and 
  the 
  bottom 
  of 
  the 
  main 
  valley. 
  Its 
  surface 
  is 
  smooth 
  

   and 
  even, 
  with 
  abundant 
  coarse 
  sand 
  and 
  gravel 
  upon 
  it 
  — 
  a 
  

   sort 
  of 
  gravel 
  loam 
  — 
  together 
  with 
  patches 
  of 
  vegetable 
  mould. 
  

   South 
  of 
  this 
  terrace, 
  on 
  the 
  opposite 
  side 
  of 
  the 
  Grand, 
  

  

  there 
  is 
  a 
  corresponding 
  terrace, 
  sharply 
  defined 
  but 
  only 
  

   a 
  few 
  rods 
  in 
  width 
  — 
  a 
  mere 
  shelf 
  against 
  the 
  face 
  of 
  the 
  steep 
  

   bluff. 
  Terrace 
  C 
  inclines 
  gently 
  to 
  the 
  west, 
  the 
  total 
  descent 
  

   being 
  perhaps 
  15 
  or 
  20 
  feet. 
  This 
  terrace 
  is 
  so 
  definite 
  a 
  

   feature 
  of 
  the 
  locality 
  that 
  one 
  can 
  scarcely 
  resist 
  the 
  conclu- 
  

   sion 
  that 
  it 
  marks 
  a 
  stage 
  of 
  the 
  ancient 
  river. 
  An 
  eye 
  esti- 
  

   mate 
  of 
  its 
  elevation, 
  made 
  from 
  the 
  railway 
  station 
  across 
  the 
  

   valley 
  at 
  Muir, 
  places 
  it 
  about 
  20 
  or 
  30 
  feet 
  above 
  the 
  station, 
  

   which 
  is 
  656 
  feet 
  above 
  sea-level. 
  An 
  elevation 
  of 
  from 
  675 
  

   to 
  685 
  feet 
  may 
  therefore 
  be 
  taken 
  as 
  a 
  fair 
  estimate. 
  

  

  The 
  nearest 
  point 
  to 
  which 
  Mr. 
  Taylor 
  traced 
  the 
  old 
  beaches 
  

   of 
  the 
  Saginaw 
  Yalley 
  is 
  at 
  Maple 
  Rapids, 
  25 
  miles 
  away. 
  At 
  

   that 
  place 
  he 
  assigns 
  to 
  the 
  Forest 
  beach, 
  the 
  lower 
  of 
  the 
  two, 
  

   an 
  approximate 
  elevation 
  of 
  680 
  feet. 
  The 
  correspondence 
  

   between 
  this 
  figure 
  and 
  the 
  estimated 
  elevation 
  of 
  terrace 
  C 
  is 
  

   so 
  close 
  that 
  the 
  conclusion 
  that 
  they 
  are 
  equivalents 
  is 
  quite 
  

   irresistible. 
  

  

  Am. 
  Jour. 
  Sol— 
  FouRia 
  Series, 
  Yol. 
  YIII, 
  No. 
  43.— 
  July, 
  1899. 
  

   3 
  

  

  