W. C. Lucy — Cemented Boulders on the Little Orme. 343 



angular boulders witli some small pebbles in a clayey matrix, all 

 cemented together by lime, which formed a septa or division present- 

 ing a singular appearance. 



Fig. 1. Mass of smooth limestone, from the shore at the 

 Little Orme, cemented together with angular houlders and 

 small pebhles in a clayey mati'ix. 



Fig. 2 represents a large mass of irregular form, being 15 ft. across 

 the top and fully 7 ft. thick. It is cemented in-like manner to Fig. 1, 

 and so firmly is it held together that it is diflficult to knock out a 

 piece with the hammer. On one side it will be seen there is an 

 opening running into the centre about 3 ft. 



^rf^ 



Fig. 2. Large mass of breccia, similar in character to Fig. 1, lying on the 

 beach at (o). See sketch of Little Orme. 



The large blocks are mainly of Carboniferous Limestone, but in 

 the mass are Basalt, Syenite, Quartzite, Granite, Felspathic Por- 

 phyry, Greenstone, rolled Slate, Trap, etc. 



As the whole of the lime which passed through the surface soil and 

 cemented these large masses together must have been derived from 

 the infiltration of rain-water, acting upon and dissolving the lime- 

 stone of the Little Orme, and as this occurred subsequently to the 

 deposition of the Boulder-clay, a considerable time must have elapsed 

 to form these conglomeratic masses of cemented detritus. 



A careful mapping of the two headlands, showing the remnants 

 of Boulder-clay and drift, would be of much service to amateur 

 geologists of glacial phenomena like myself, when visiting this 

 district, and I trust the same will be undertaken by some one of our 

 Professors of Geology this Autumn season. 



