﻿160 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Jefferson 
  . 
  

   To 
  the 
  south 
  of 
  Summit 
  is 
  Jefferson, 
  the 
  southwestern 
  town- 
  

   ship 
  of 
  Schoharie 
  co., 
  which 
  is 
  bounded 
  on 
  the 
  south 
  by 
  

   Stamford 
  and 
  Harpersfield 
  townships 
  of 
  Delaware 
  co. 
  and 
  

   on 
  the 
  west 
  by 
  Harpersfield 
  and 
  a 
  part 
  of 
  Summit. 
  Across 
  the 
  

   central 
  part 
  extends 
  an 
  elevated 
  ridge, 
  from 
  north 
  to 
  south, 
  

   which 
  culminates 
  in 
  Mt 
  Jefferson. 
  In 
  the 
  southern 
  part 
  of 
  the 
  

   township 
  is 
  the 
  head 
  of 
  the 
  Delaware 
  river; 
  near 
  the 
  center 
  is 
  

   the 
  source 
  of 
  Middle 
  brook, 
  one 
  of 
  the 
  largest 
  branches 
  of 
  the 
  

   upper 
  Charlotte 
  river; 
  in 
  the 
  northwestern 
  part 
  are 
  other 
  

   branches 
  of 
  the 
  Charlotte 
  while 
  on 
  the 
  east 
  are 
  the 
  Westkill 
  and 
  

   the 
  head 
  waters 
  of 
  Mill 
  creek 
  and 
  the 
  Minekill 
  all 
  three 
  tribu- 
  

   taries 
  of 
  the 
  Schoharie 
  river. 
  In 
  the 
  northern 
  part 
  of 
  the 
  town- 
  

   ship 
  to 
  the 
  east 
  of 
  Morseville 
  and 
  northwest 
  of 
  Jefferson 
  are 
  

   ledges 
  of 
  coarse 
  grained, 
  greenish 
  gray 
  sandstone 
  similar 
  to 
  the 
  

   Oneonta, 
  which 
  have 
  already 
  been 
  mentioned. 
  

  

  XXVII 
  B 
  2 
  . 
  To 
  the 
  north 
  of 
  Jefferson 
  village 
  and 
  Middle 
  brook 
  

   are 
  exposures 
  of 
  thin 
  sandstones 
  and 
  arenaceous 
  shales, 
  with 
  some 
  

   very 
  calcareous 
  layers 
  which 
  are 
  composed 
  largely 
  of 
  Spwifer 
  

   mesastriaUs 
  Hall. 
  These 
  calcareous 
  layers 
  are 
  called 
  "fire 
  stones" 
  

   by 
  the 
  farmers 
  and 
  the 
  loose 
  pieces 
  are 
  picked 
  up 
  and 
  used 
  for 
  

   arches. 
  Some 
  of 
  the 
  rocks 
  were 
  found 
  in 
  place 
  at 
  about 
  the 
  

   same 
  elevation 
  as 
  the 
  central 
  part 
  of 
  the 
  village; 
  but 
  it 
  is 
  approx- 
  

   imately 
  190 
  feet 
  lower 
  than 
  the 
  coarse, 
  greenish 
  gray 
  sandstone 
  

   on 
  the 
  hill 
  two 
  and 
  one 
  third 
  miles 
  west 
  of 
  north 
  of 
  Jefferson 
  

   (XXVII 
  A 
  1 
  ). 
  The 
  most 
  abundant 
  fossil 
  is 
  Spirifer 
  mesastrialjs 
  

   Hall 
  which 
  occurs 
  in 
  the 
  calcareous 
  layers, 
  but 
  some 
  of 
  the 
  arena- 
  

   ceous 
  shales 
  contain 
  specimens 
  of 
  a 
  few 
  species 
  of 
  Lamellibranchs. 
  

   The 
  complete 
  list 
  of 
  specimens 
  is 
  as 
  follows: 
  

  

  1 
  Spirifer 
  mesastriaUs 
  Hall 
  (a) 
  

  

  2 
  S. 
  mucronatus 
  (Con.) 
  Bill. 
  (r) 
  

  

  3 
  Camarotoechia 
  exima 
  (Hall) 
  H. 
  & 
  C. 
  (c) 
  

  

  4 
  Tropidoleptus 
  carinatus 
  (Con.) 
  Hall 
  (rr) 
  

  

  5 
  Microdon 
  (Cypricar 
  della) 
  gregarius 
  Hall 
  (a) 
  

  

  