﻿342 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  4 
  Rmsslaeria 
  ovoides 
  (Eaton) 
  Hall 
  (c) 
  

  

  5 
  Eatonia 
  peculiaris 
  (Con.) 
  Hall 
  (c) 
  

  

  6 
  Meristella 
  lata 
  Hall 
  (r) 
  

  

  7 
  Leptocoelia 
  flabellites 
  (Con.) 
  Hall 
  (r) 
  

  

  8 
  Orthis 
  (Rhipidomella) 
  musculosa 
  Hall 
  (c) 
  

  

  9 
  Hipparionyx 
  proximus 
  (Van.) 
  H. 
  & 
  C. 
  (?) 
  (r) 
  

  

  Small 
  specimens, 
  probably 
  young 
  individuals 
  

  

  10 
  Platyosioma 
  ventricosa 
  Con. 
  (r) 
  

  

  11 
  OrbicuJoidea'ampla 
  (Ha.l\)=Discina 
  grandis 
  (Hall) 
  H. 
  & 
  C. 
  (r) 
  

  

  12 
  Oriliis 
  sp. 
  (r) 
  

  

  13 
  Stropfoeodonta 
  cf. 
  magniventra 
  Hall 
  (r) 
  

  

  14 
  Platyceras 
  nodosum 
  Con. 
  (r) 
  

  

  C. 
  S. 
  P. 
  

  

  CLARKSVILLE 
  AND 
  ONISKETHAU 
  CREEK 
  

  

  Clarksville 
  lies 
  about 
  12 
  miles 
  southwest 
  of 
  Albany 
  on 
  the 
  

   Delaware 
  turnpike 
  in 
  the 
  southwestern 
  part 
  of 
  New 
  Scotland 
  

   township. 
  The 
  village 
  is 
  in 
  a 
  small 
  depression 
  with 
  Bennett 
  hill 
  

   on 
  the 
  south 
  and 
  Wolf 
  hill 
  on 
  the 
  west, 
  while 
  on 
  the 
  east 
  and 
  

   north 
  is 
  a 
  ridge 
  from 
  50 
  to 
  100 
  feet 
  high. 
  There 
  is 
  little 
  doubt 
  

   that 
  this 
  depression 
  was 
  at 
  one 
  time 
  a 
  lake. 
  Oniskethau 
  creek 
  

   however 
  long 
  ago 
  cut 
  a 
  gorge 
  100 
  feet 
  or 
  more 
  deep 
  through 
  the 
  

   ridge 
  to 
  the 
  east. 
  

  

  The 
  Oniskethau 
  creek 
  rises 
  in 
  the 
  Helderberg 
  mountains 
  west 
  

   of 
  Wolf 
  and 
  Countryman 
  hills, 
  and 
  flowing 
  east 
  between 
  them 
  

   turns 
  southeast 
  along 
  the 
  base 
  of 
  Wolf 
  hill 
  and 
  passing 
  through 
  

   the 
  villages 
  of 
  Clarksville 
  and 
  South 
  Bethlehem 
  unites 
  with 
  the 
  

   Spraytkillto 
  form 
  Coeymans 
  creek 
  which 
  enters 
  the 
  Hudson 
  at 
  

   Coeymans. 
  At 
  Clarksville 
  the 
  Oniskethau 
  breaks 
  through 
  the 
  

   Upper 
  Helderberg 
  formations 
  making 
  two 
  deep 
  and 
  narrow 
  

   gorges; 
  one 
  75 
  or 
  more 
  feet 
  deep 
  through 
  the 
  Onondaga 
  limestone 
  

   just 
  above 
  the 
  village, 
  and 
  the 
  other 
  which 
  has 
  just 
  been 
  men- 
  

   tioned 
  through 
  the 
  ridge 
  of 
  Esopus 
  shales 
  east 
  of 
  the 
  village. 
  

   About 
  two 
  miles 
  southeast 
  of 
  Clarksville 
  at 
  the 
  saw 
  mill 
  of 
  

   Cornelius 
  Slingerland 
  a 
  less 
  conspicuous 
  cut 
  is 
  made 
  through 
  

   the 
  shaly 
  member 
  of 
  the 
  Lower 
  Helderberg 
  series. 
  At 
  the 
  head 
  

  

  