ON THE EBBATIC BLOCKS OF ENGLAND, WALES, AND IBELAND. 139 



nature of the subject will admit that there is no single locality from which 

 they could have been derived excepting the S. of Scotland. 



Many fresh ' greenstone ' boulders have been lately exposed in the 

 newest Bootle Dock excavation. The largest is 6 X 45 X 3 feet, and was 

 found on the surface of the upper boulder clay. A very large proportion 

 of the boulders are excessively flattened and regularly grooved. One 

 has been removed to the inner end of the passage between the Liverpool 

 Free Library and the Picton reading-room. Three feet in diameter of its 

 surface are perfectly flattened and indented with deep parallel grooves 

 like a work of art. 



It is a remarkable fact that in the Bootle Dock excavations the ' green- 

 stone ' boulders are accompanied by very little Scotch granite ; while on 

 the shore of the Dee estuary between West Kirby and Parkgate similar 

 boulders are associated with much Scotch granite. It is also remarkable 

 (and equally difficult to explain) that whilst at Bootle the boulders are 

 intensely glaciated on the shore of the Dee estuary, scarcely any of them 

 show signs of ice- action. 



The largest boulder on the shore of the Dee estuary is 6x4x3 feet, 

 and is apparently a diorite. 



Mr. J. R. Dakyns favours the Committee with the following Report 

 on the Shap Granite Boulders on the Yorkshire Coast : — 

 Shap Granite Boulders on the Yorkshire Coast. 



I have examined this coast from Cloughton Wyke, 4 miles north of 

 Scarborough, to the Talbot Hotel, 6 miles south of Hornsea, a distance 

 of about 46 miles. 



The boulders of Shap granite are not found indifferently on any part 

 of the coast, but they occur plentifully at certain parts, and are entirely 

 wanting along the rest of the coast. 



Within the space examined they occur principally in four localities, as 

 follows, beginning from the north : there are several, four at least, at 

 Long Nab, on the north side of the Nab ; one of these measm-es 8 cubic 

 feet ; there are also several, six or seven at least, at Cromer Point, also on 

 the north side of the point. 



South of Cromer Point there are none till you come nearly to Filey. 

 There is one large one, measuring nearly 3 x 2J X 2 feet, on the top of the 

 cliff about a mile from Filey ; this is at the third fence north of the notice 

 ' No Road' near the Spa ; it bears N. 15° E. from Filey Station. It is 

 probably practically undisturbed, for the ground slopes inland from the 

 cliff, and therefore if it has been turned up in ploughing and moved, it 

 cannot have been moved far, for no one would take the trouble to cart a 

 huge boulder far uphill. This is the only undisturbed boulder of Shap 

 granite that I have seen on the land ; all the others are on the shore, and 

 have fallen out of the cliff above them. There are several on the shore 

 along the north part of Filey Bay, but none along the south, nor are any 

 more to be met with going south till one reaches Flamborough Head. 



There are several on the shore between Flamborough Head and Flam- 

 borough South Landing. Some of these are large, one measuring 36 cubic 

 feet. 



South of this locality, the only one I have seen on the shore, is a 

 small one rather more than a mile south of Bridlington Quay. But I do 

 not doubt that they do occur farther south occasionally, because there is 

 one built into a wall at Hornsea. 



