﻿COASTS 
  OF 
  WASHIISrGTON 
  AND 
  OEEGON. 
  15 
  

  

  made 
  by 
  the 
  Albatross, 
  although 
  Capt. 
  Carrol, 
  until 
  recently 
  of 
  the 
  

   Decorali, 
  reports 
  that 
  he 
  made 
  one 
  sounding 
  of 
  20 
  fathoms 
  in 
  this 
  

   vicinity. 
  This 
  ridge 
  is 
  the 
  outer 
  wall 
  of 
  a 
  submarine 
  valley 
  having, 
  

   so 
  far 
  as 
  sounded, 
  an 
  extreme 
  depth 
  of 
  47 
  fathoms, 
  shoaling 
  at 
  its 
  

   mouth 
  to 
  42 
  fathoms 
  and 
  merghig 
  with 
  the 
  flat 
  of 
  the 
  continental 
  

   sheK 
  at 
  the 
  50-fathom 
  curve. 
  On 
  both 
  sides 
  of 
  the 
  ridge, 
  and 
  princi- 
  

   pally 
  at 
  the 
  upper 
  end 
  of 
  the 
  submarine 
  valley 
  formed 
  by 
  it, 
  the 
  late 
  

   summer 
  run 
  of 
  halibut, 
  developed 
  by 
  this 
  survey, 
  was 
  found. 
  The 
  

   bottom 
  across 
  the 
  head 
  of 
  and 
  tlirough 
  the 
  greater 
  extent 
  of 
  the 
  floor 
  

   of 
  the 
  valley 
  is 
  of 
  coarse 
  gray 
  sand, 
  carrying 
  a 
  very 
  rich 
  growth 
  of 
  

   such 
  organisms 
  (sea 
  anemones 
  and 
  pennatulids) 
  as 
  are 
  typically 
  

   found 
  on 
  good 
  hahbut 
  bottom. 
  

  

  Over 
  the 
  ridge 
  and 
  prmcij)ally 
  on 
  its 
  northwestern 
  and 
  southern 
  

   slopes 
  is 
  fomid 
  what 
  has 
  been 
  designated 
  as 
  broken 
  bottom 
  — 
  com- 
  

   posed 
  of 
  materials 
  of 
  a 
  mixed 
  character, 
  shale, 
  gravel, 
  sand, 
  and 
  

   mud 
  — 
  in 
  patches 
  varying 
  in 
  size 
  and 
  composition, 
  but 
  all 
  very 
  rich 
  

   m 
  bottom-livmg 
  organisms. 
  On 
  the 
  western 
  slope 
  is 
  a 
  patch 
  of 
  

   coarse 
  gray 
  sand 
  and 
  another 
  of 
  gravel, 
  apparently 
  of 
  considerable 
  

   extent, 
  though 
  no 
  great 
  number 
  of 
  soundings 
  were 
  made 
  there. 
  On 
  

   this 
  patch 
  a 
  good 
  lot 
  of 
  fish 
  were 
  taken 
  (set 
  xxxiv). 
  

  

  Heceta 
  Bank 
  section. 
  — 
  Similar 
  to 
  the 
  ridge 
  off 
  Newport, 
  but 
  larger 
  

   and 
  in 
  somewhat 
  deeper 
  water, 
  there 
  is 
  a 
  large, 
  roughly 
  triangular 
  

   plateau 
  called 
  Heceta 
  Bank, 
  between 
  25 
  and 
  30 
  miles 
  offshore 
  to 
  the 
  

   southwestward 
  of 
  Heceta 
  Head. 
  It 
  is 
  composed 
  largely 
  of 
  shale 
  too 
  

   hard 
  for 
  good 
  halibut 
  bottom, 
  while 
  the 
  submarine 
  valley 
  formed 
  by 
  

   ■it 
  is 
  too 
  soft, 
  having 
  a 
  bottom 
  of 
  soft 
  green 
  mud. 
  Several 
  patches 
  

   each 
  of 
  broken 
  bottom 
  and 
  black 
  sand 
  occur 
  both 
  on 
  the 
  flat 
  of 
  the 
  

   bank 
  and 
  on 
  the 
  offshore 
  slopes. 
  The 
  most 
  ni^omising 
  broken 
  bot- 
  

   tom 
  is 
  in 
  the 
  vicinity 
  of 
  set 
  xr, 
  where 
  a 
  lot 
  of 
  fish 
  were 
  taken 
  in 
  the 
  

   spring 
  of 
  the 
  year 
  (set 
  i). 
  Black 
  sand 
  is 
  considered 
  good 
  black 
  cod 
  

   bottom 
  and 
  on 
  one 
  patch 
  of 
  it 
  (set 
  x) 
  a 
  fair 
  catch 
  was 
  made. 
  

  

  Between 
  Heceta 
  Bank, 
  Alsea 
  Bay, 
  and 
  Heceta 
  Head 
  is 
  a 
  large 
  area 
  

   of 
  fine 
  gray 
  sand 
  which 
  below 
  Heceta 
  Head 
  is 
  encroached 
  upon 
  by 
  

   the 
  green 
  mud 
  of 
  the 
  submarine 
  valley 
  formed 
  by 
  Heceta 
  Bank. 
  Off 
  

   the 
  mouth 
  of 
  the 
  Siuslaw 
  River 
  is 
  a 
  small 
  isolated 
  patch 
  of 
  gravel 
  

   surrounded 
  by 
  fuie 
  gray 
  sand. 
  The 
  mud 
  line 
  trends 
  in 
  from 
  the 
  

   70-fathom 
  line 
  toward 
  the 
  Umpqua 
  River, 
  where 
  it 
  reaches 
  the 
  

   30-fathom 
  curve 
  less 
  than 
  2h 
  miles 
  offshore. 
  Another 
  gravel 
  patch 
  

   about 
  7 
  miles 
  below 
  the 
  Umpc^ua 
  lies 
  withm 
  this 
  mud 
  area 
  but 
  6 
  

   miles 
  from 
  shore, 
  and 
  south 
  of 
  this 
  the 
  mud 
  recedes 
  until 
  it 
  lies 
  

   beyond 
  the 
  70-SO-fathom 
  line 
  10 
  miles 
  off 
  Coos 
  Bay. 
  

  

  Coos 
  Bay 
  section. 
  — 
  In 
  a 
  line 
  between 
  the 
  Umpqua 
  River 
  and 
  Coos 
  

   Bay, 
  three 
  sets 
  (xxvii, 
  xxix, 
  and 
  xxx) 
  were 
  made 
  on 
  fine 
  gray 
  sand, 
  

   which 
  occurs 
  everywhere 
  in 
  this 
  region 
  inshore 
  of 
  the 
  mud. 
  As 
  de- 
  

   veloped 
  hj 
  the 
  above 
  sets, 
  this 
  sand 
  bottom 
  seems 
  to 
  carry 
  a 
  thin 
  

  

  