REPORT OF FIELD MEETINGS. 73; 



series which comprises the " Six- Yard " and " Four-Fathom " 

 limestones, the former being the lower. As far as Salter's 

 Gate nearly the coast exhibits quite a number of interesting 

 faults, some of them intersecting in such a way as to form 

 so-called " trough " vaults. In consequence of these disloca- 

 tions the bedding is disturbed in a highly complicated manner. 

 From Salter's Gate to just south of Cullernose a gentle un- 

 dulation alone varies the general dip which is here northerly. 

 Besides the limestones mentioned, shales and sandstones are 

 the chief rocks so far. The cliff is capped by boulder clay, 

 containing boulders of many varieties of rock, both local and 

 from a distance, and at about 50 feet from the beach and over- 

 lying the boulder clay is a thin layer of stratified shingle (i to 

 2 feet thick only) which should be searched for shells, as it is 

 supposed by Professor Garwood to be a raised beach, and 

 indeed it very well may be. Before reaching the outcrop of 

 the " Four-Fathom " limestone a small basaltic dyke may.be 

 seen just reaching high-water mark. This dyke is interesting 

 as showing its upward termination within the bed of sand- 

 stone which underlies the limestone. The "Four-Fathom" 

 limestone (with its associated shales) is particularly well 

 exposed, and yields many excellent fossils. It is soon, how- 

 ever, cut off by a fault which has been filled in with basalt, 

 thus forming another dyke very near to, but not actually seen 

 in contact with the Great Whin Sill which forms the main and 

 most striking feature of the Point. In the whin sill, which is 

 here finely columnar, huge fragments of some of the under- 

 lying strata are seen caught up by the igneous intrusive mass, 

 and by it baked and altered so as to exhibit quite a new set 

 of minerals when examined in thin slices under the micro- 

 scope. Garnets have been found there. 



CULLERNOSE POINT TO DUNSTANBOROUGH. 



The coast from Cullernose Point to Castle Point is entirely 

 formed by the Great Whin Sill. At the last-named headland, 

 and at Gull Crag round the corner, the base of the whin sill 

 is splendidly shown, baked shales of considerable thickness 



