STATHEll : NOTES ON EAST YORKSHIRE BOULDERS. 
239 
Jamesoni beds of the Lower Lias, while on the beach patches 
of Upper Lias occur. One of these patches was observed under 
specially favourable conditions during the summer of 189S. The 
boulder occurred on the beach forty yards from the foot of the 
cliffs, and consisted of a patch of black shale twenty yards long 
by ten yards wide, surrounded by boulder-clay. The shale 
showed few, if any, signs of crushing, and contained numerous 
well-preserved fossils, including Ammonites comimmis and Leda 
ovum. Mr. G. Lether, of Scarborough, also informs me that he 
has seen similar large masses of shale containing Upper Lias 
fossils in the boulder-clay cliffs situated in the Clilf Bridge 
Company's grounds, south of Scarborough. 
Oolite. Boulders of Oolite are comparatively rare in south 
Holderness ; but as we proceed northwards and approach the 
neighbourhood of Filey and Scarborough, where these rocks occur 
in situ, Oolitic boulders become exceedingly numerous in the 
adjacent glacial clays. 
SjJeeton Clay. Mr. Lamplugh has also pointed out that the 
lower part of the drifts resting on the Chalk around Selwick's 
Bay, Flamborough Head, is largely composed of re-arranged 
Speeton Clay. 
Chalk. As far as I am aware no boulders of Chalk twelve 
inches and upwards in diameter have been noted in the drifts 
north of Flamborough Head. In Holderness they occur in fair 
numbers, though somewhat unequally distributed, as the following 
list shows : — 
At Barmston ... ... 17 per cent, of the boulders are Chalk. 
„ Skipsea ... ... 14 „ ,, ,, 
Atwick ... ... 36 ,, ,, ,, 
„ Hornsea ... ... 10 ,, „ „ 
„ Mappleton... ... 12 ,, „ „ 
„ North of Aldbrough 24 „ „ „ 
„ South of Aldbrough 9 „ „ „ 
„ Thorp Garth ... 4 ,, „ „ 
„ Hilston ... ... 3 „ „ „ 
„ Tunstall ... ... 3 
