104 NEW YORK STATE MUSEUM 
It is very different with the Eurypterus horizon in the Shawangunk 
grit. There the eurypterids occur in thin shale intercalations that are 
found in endless repetition between heavy beds of conglomerate and grit. 
1 The following section has been measured at Otisville [Clarke, 1907, p. 299]: 
Section of the Shawangunk series in ascending order 
Erie Ratlroad cut 4 mile west of Otisville 
) 
129 ft of ‘Hudson River” shale with interbedded thin layers of sandstone 
Unconformity 
SHAWANGUNK SERIES | 
12’ conglomerate 6” shale, thinning out rapidly 
2”’ shale 13’ 5” grit 
8’ conglomerate 2’ shale 
2” shale 5’ grit 
1’ conglomerate 4’ shale 
2’ shale 7’ grit : 
16’ 8” conglomerate —  «I’ shale becoming thicker at top of cut 
2’ shale 41’ grit 
6’ 10” grit 50’ (estimated) of grit not exposed 
6” shale between top of railroad cu’. sec- 
2’ 10” grit | tion and base of quarry section 
Erie Railroad quarry 4 mile west of Olusville 
Tor’ grit 3’ grit 
5’ shale | 1” shale’ 
3’ 6” grit 8’ prit 
2’’ shale 1’ shale 
2’ grit | 21’ grit 
2” shale 4'’ shale 
7’ 6’ grit | 8’ grit 
2” shale 2’ shale 
12’ grit — | 1’ 9” grit 
&”’ shale 2’’ shale 
3’ grit 1’ 6” grit 
10” shale 3’ shale 
17" 2’’ grit | 5 grit 
4 shale 2 shale Very productive band in 
or et | — or grit section 16’ 8” begin- 
ls ale Productive band. From 4 ,_ Shale ning at 298’ 5” above 
but a vertical section of to" grit contact 
2 shale 23’ 6” beginning 198’ 2” shale 
3° e grit “’”’ above contact of 22" grit 
28 vale Shawangunk grit and 2 shale 
7) grit ‘Hudson River” shale 6” grit 
11’ grit 1’ 6” grit tion of 1’ 9’, 343’ 3” 
2” shale 3” shale Productive band; sec- 
I” shale 2” shale above contact 
