556 
Mr. Winch on the 'Eastern Part of Yorkshire* 
Nautilus imperialis . • Sowerby tab. 1. 
discus . . . Sow. tab. 12. 
Modiola depressa . . . Sow. tab. 8. mid. fig. 
Orthoeera conica . . Sow. tab. 6. fig. 1 & 2. 
Belemnites 
Mya .... 2 species 
Chama digitata . . . Sow. tab. 174. 
Helix 
Trigonia 
Pentacrinite 
Pectenite resembling the common scallop. 
These are all mineralized by clay ironstone, iron pyrites, and 
calcareous spar. 
Gigantic reeds resembling arundo donax, are found in the sea 
cliffs opposite High Whitby. They appear to have been rooted in 
a bed of shale or slate clay, and their remains protrude into a stra- 
tum of sandstone five feet thick. Those which stand erect retain 
their shape, but those which do not are compressed. Their tops 
seem to have been broken off ; the woody matter has disappeared, 
leaving sandstone casts. Casts of Euphorbias are also found in the 
sandstone strata above the alum rocks. Wood mineralized by iron 
is frequently found at Kettleness and Snowbrow. Trunks and 
branches of fossil trees, the bark and softer parts of which have 
been changed into jet, are frequently met with in the alum-shale ; 
and leaves and impressions like those of the palm, are found in 
the sandstone and ironstone. 
Galena is met with occasionally in nodules of the latter mineral ; 
and hair pyrites (Sowerby, tab. 28) is found, though rarely, at 
Kettleness. 
In the oolite at Malton and other places in that neighbourhood, 
