July 17, 1885.] 



ki^b'Wl^iSlD'Gi: "♦ 



ridge in front of the 

 in such a way as to a 

 the eyes, ahuost enl 



At lir.st It 1,; pale, and the elytra aiv 

 the body can be seen throuuh linn, 

 however, they acquire their eliar.h 

 colour and opacity. The jiujia .sliu 

 parts of the perfect insect, the he 

 feeing bent down underneath the bod; 



• all the 



,a-ajiees, and appart 



as though there wore no limit to 



which they are capable. Perhaps 



1, tViit iL seems 



lodificatious of 



{he best illustrations 



THE DEEP-SEATED HOCKS IN THE 

 XETGHBOUKHOOD OF LONDON. 



A" 



tlio papers i 



; the 



5upplen 



sting of the Geological 





I the 



imond, Surrey." "By Prof, .rohn W. Jndd, 

 F.R.'S., 8ec.G.S., and Collett Uomereham, Esq., F.G.S. 



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

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

 Richmond Vestry and the contractors, Messrs. Docivra & Co., has 

 had to 1)6 abandoned, after, reaching a total depth of 1,117 feet 

 from the surface. This depth is 143 feet greater than that of 

 any other well in the London Basin, and, reclconini;: 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 waa demon- 

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

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

 obtained concerning their geological ago. They may be referred 

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

 (for similar strata have been found intercalated in the Carboniferous 

 series at Gavton, 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 Hitohin, has found 

 the exact analogue of the curious conglomerated chalk met with at 

 a depth of 701 feet at Richmond. Uis observations entirely confirm 

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

 with the zone of BetemoitiS plenum in a remani^- 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 con- 

 cerning the distribution of the Jurassic rocks on tlie south side of 

 the London Basin, an important piece of confirmatory evidence 

 has been supplied by a deep boring made at the Dockyard-Exten- 

 sion 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 11 fort of sandy strata of Xeoconn-an age, 

 and that these are directly underlain by blue clays of Middle 



Ixfordiai 



Id 



fi from the r 



