﻿GEOLOGY 
  OF 
  THE 
  PORT 
  LEYDEN 
  QUADRANGLE 
  35 
  

  

  1280 
  feet 
  above 
  sea 
  level. 
  Thus 
  in 
  a 
  distance 
  of 
  25 
  miles 
  the 
  toip 
  

   of 
  the 
  Trenton 
  drops 
  1485 
  feet 
  or 
  shows 
  a 
  southerly 
  dip 
  of 
  nearly 
  

   60 
  feet 
  per 
  mile. 
  

  

  According 
  to 
  Orton,^ 
  the 
  top 
  of 
  the 
  Trenton 
  in 
  the 
  Central 
  

   Square 
  (Oswego 
  co.) 
  well 
  was 
  struck 
  at 
  1209 
  feet 
  below 
  sea 
  level. 
  

   The 
  same 
  horizon 
  2 
  miles 
  west 
  of 
  Port 
  Leyden 
  is 
  at 
  an 
  altitude 
  of 
  

   1280 
  feet 
  above 
  the 
  sea 
  which 
  thus 
  shows 
  an 
  increased 
  elevation 
  of 
  

   2489 
  feet 
  within 
  44 
  miles 
  or 
  a 
  southwesterly 
  dip 
  of 
  over 
  56 
  feet 
  per 
  

   mile. 
  

  

  In 
  the 
  Stillwater 
  (Oswego 
  co.) 
  well 
  Orton 
  ^ 
  reports 
  the 
  surface 
  

   of 
  the 
  Trenton 
  at 
  25 
  feet 
  below 
  sea 
  level 
  and 
  this 
  is 
  1305 
  feet 
  below 
  

   the 
  same 
  horizon 
  2 
  miles 
  west 
  of 
  Port 
  Leyden. 
  The 
  distance 
  is 
  

   30 
  miles 
  and 
  the 
  westward 
  dip 
  is 
  over 
  43 
  feet 
  per 
  mile. 
  

  

  Within 
  the 
  map 
  limits, 
  near 
  Locust 
  Grove, 
  the 
  Trenton-Utica 
  con- 
  

   tact 
  is 
  at 
  an 
  elevation 
  of 
  nearly 
  1300 
  feet, 
  while 
  2 
  miles 
  to 
  the 
  

   Fouthwest 
  it 
  is 
  a 
  little 
  over 
  iioo 
  feet, 
  thus 
  indicating 
  a 
  southwest- 
  

   ward 
  dip 
  here 
  of 
  about 
  50 
  feet 
  per 
  mile. 
  

  

  An 
  exceptional 
  dip 
  of 
  3 
  or 
  4 
  degrees 
  toward 
  the 
  southwest 
  may 
  

   be 
  seen 
  in 
  the 
  Trenton 
  limestone 
  in 
  the 
  vicinity 
  of 
  Martinsburg. 
  

   This 
  is 
  probably 
  due 
  to 
  the 
  updrag 
  effect 
  of 
  the 
  fault 
  below 
  

   described. 
  

  

  Faults 
  and 
  folds 
  

  

  No 
  fault 
  of 
  sufficient 
  extent 
  to 
  be 
  mapped 
  has 
  been 
  found 
  within 
  

   the 
  limits 
  of 
  the 
  quadrangle. 
  A 
  few 
  places 
  have 
  been 
  noted 
  where 
  

   there 
  have 
  been 
  slight 
  movements 
  of 
  i 
  or 
  2 
  feet 
  as 
  for 
  example 
  in 
  

   the 
  Trenton 
  of 
  the 
  Black 
  river 
  gorge 
  2^ 
  miles 
  northeast 
  of 
  

   Boonville. 
  

  

  Just 
  beyond 
  the 
  edge 
  of 
  the 
  map 
  and 
  in 
  a 
  ravine 
  ^ 
  of 
  a 
  mile 
  

   northwest 
  of 
  East 
  Martinsburg 
  station 
  a 
  fault 
  with 
  considerable 
  

   displacement 
  is 
  well 
  shown. 
  No 
  detailed 
  study 
  of 
  this 
  fault 
  has 
  

   been 
  made, 
  but 
  it 
  is 
  of 
  the 
  normal 
  type 
  and 
  strikes 
  approximately 
  

   northwest-southeast. 
  Its 
  length 
  was 
  not 
  determined. 
  The 
  faulc 
  

   plane 
  stands 
  nearly 
  vertical 
  and 
  the 
  limestone 
  beds 
  are 
  highly 
  in- 
  

   clined 
  on 
  the 
  south 
  side 
  as 
  a 
  result 
  of 
  the 
  updrag 
  during 
  the 
  process 
  

   of 
  faulting. 
  On 
  the 
  north 
  side 
  of 
  the 
  ravine 
  the 
  Precambric 
  lie.>^ 
  

   fully 
  40 
  or 
  50 
  feet 
  higher 
  than 
  on 
  the 
  south 
  side 
  and 
  this 
  represents 
  

   the 
  amount 
  of 
  the 
  throw. 
  The 
  Pamelia 
  beds 
  have 
  been 
  faulted 
  

   against 
  the 
  Precambric. 
  The 
  unusually 
  rapid 
  downward 
  slope 
  of 
  

  

  1 
  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  30. 
  1899. 
  p. 
  455. 
  

  

  2 
  loc. 
  cit. 
  p. 
  448. 
  

  

  