246 tute: on some singular nodules in the magnesian limestone. 
The nodules at Wormald Green occur in the lowest beds of the 
middle Permian Limestone, which are )^ellow, and much fractured. 
The nodules themselves are nearly white, in section have frequently 
a regular oval form, with dark central markings, either oval or 
approximately oval, as if some round organic substance like sea- 
weed had formed the nucleus of a deposit, and had been occasionally 
crushed into a flattened form.* The dark portions seem to indicate 
the presence of carbonaceus matter. 
Other nodules occur, more spread out, and flatter, which exhibit 
faint parallel bands, which probably mark the successive deposits of 
silicate of lime. 
* Op. cit. EL, III), 4, 5, 6. Ill, 1, 2; iv. 
THE OCCURRENCE OF A TOOTH OF A MASTODON IN THE GLACIAL DRIFT. 
BY REV. J. STANLEY TUTE, B.A. 
Mr. Bullivant, the schoolmaster of South Stainley, has showed me 
the Tooth of a Mast<xlon, which he found in a pit of Glacial Drift, on 
the road-side, about a mile from Ripley. The tooth was about six feet 
from the surface, in a bed_of clay, grit, water-worn stones, and sharp 
angular rocks. About a foot above the tooth was a layer of sand. 
The drift is a portion of the brown glacial stream from the N. W., 
which spreads out eastward into the vale of York, it is cut off on the 
west by Cay ton Gill, and on the south by the river Nidd. Near the 
river Laver, at Aldfield, it overlies an older bed of dark-coloured drift. 
