Geological Society of London. 381 



Surrey." By Prof. John W. Jucld, F.E.S., Sec.G.S., and Collett 

 Homersham, Esq., F.G.S. 



Since the author's former communication to the Society on the 

 subject, this boring, in spite of the strenuous efforts made by the 

 Richmond Vestry and the contractors, Messrs. Docwra and Co., has 

 had to be abandoned, after reaching a total depth of 1447 feet from 

 the surface. This depth is 145 feet greater than that of any other 

 well in the London Basin, and, reckoning from Ordnance Datum, 

 reaches a lower level by 312 feet than any other well in the district. 



Before the termination of the work, temperature-observations 

 were obtained, which, generally, confirm those previously arrived at. 



The strata in which the boring terminated consisted of the red 

 and variegated sandstones and marls previously described, which 

 were proved to the depth of 208 feet. Although it was demon- 

 strated that these beds have a dip of about 30°, complicated in 

 places by much false-bedding, no conclusive evidence could be 

 obtained concerning their geological age. They may be referred 

 either to some part of the Poikilitic series, or to the Carboniferous 

 (for similar strata have been found intercalated in the Carboniferous 

 series at Gayton, near Northampton), or they may be regarded as of 

 Old Red Sandstone age. 



Some interesting additional observations have been made, since 

 the reading of the former paper, on the Cretaceous rocks passed 

 through in this well. Mr. W. Hill, F.G.S., of Hitchin, has found 

 the exact analogue of the curious conglomerated chalk met with at 

 a depth of 704 feet at Richmond. His observations entirely confirm 

 the conclusion that we have at this depth the "Melbourne Rock" 

 with the zone of Belemnites plenus in a remanie condition at its base. 

 Some new facts concerning the state of preservation of the fossils 

 in the Chalk Marl are also recorded. 



With respect to the conclusions arrived at by the author concern- 

 ing the distribution of the Jurassic rocks on the south side of the 

 London Basin, an important piece of confirmatory evidence has been 

 supplied by a deep boring made at the Dockyard-Extension Works 

 at Chatham. This section, for the details of which the authors are 

 indebted to the officers of the Geological Survey, shows that under 

 the Chalk and Gault, with normal characters and thickness, there 

 lie 41 feet of sandy strata of Neocomian age, and that these are 

 directly underlain by blue clays of Middle Oxfordian age, as is 

 proved by the numerous fossils which they have yielded. We have 

 now, therefore, direct evidence of the existence and position of strata 

 of Lower, Middle, and Upper Oolite age, respectively, beneath the 

 Cretaceous rocks of the south-east of England. 



2. " On the Igneous and Associated Rocks of the Breidden Hills 

 in East Montgomeryshire and West Shropshire." By W. W. Watts, 

 Esq., F.G.S. 



The author, in this paper, described the succession of rocks in the 

 small tract near the Breidden Hills situated between Welshpool and 

 Shrewsbury. The Cambrian rocks are : — 



a. Criggion Shales, dark and barren, much penetrated by intrusive 

 diabases and about 2700 feet thick. 



