22 Geology 



of these are 3 ft. by 2 ft by 18 ins., and contain specimens of 

 Fusus, APORRHAIS, CALYPTROZA, NATICA, CYPRINA, PANOPOEA, and 

 PECTUNCULUS. 



A representative section noted by Mr. Chandler was as follows : 



Sandy clay and clayey sand with bones, 25 to 30 feet. 

 Clay with bones and worked flakes, 4 to 6 feet. 

 Corbicula-layer, 6 inches. 

 Sand to base, 7 to 9 feet. 



The bones obtained from this pit were those of ELEPHAS PRIMI- 

 GENIUS (mammoth) Bos, EQUUS, RHINOCEROS, CERVUS (?) 



In the Corbicula-layer the following have been obtained : 

 CYRENA FLUMINALIS, PLANORBIS, VALVATA, ANCYLUS, LIMNEA, 

 HELIX, PUPA, BYTHINIA, CYPRIDS, SLUG (?), CHARA (?) UNIO 

 LITTORALIS (which can be obtained entire ; in the other pits they are 

 usually broken), ANODONTA CYGNEA, VALLONIA PULCHELLA, teeth 

 and small bones of rodents, etc. 



At Turner's Pits, near Slade Green, the Rev. O. Fisher obtained, 

 in 1870 (1872 ?), the first worked flake found in the Crayford 

 deposits. 



Mr. Chandler's generalised sections are as follows : 



FIRST PIT. SECOND PIT. 



Soil with irregular base, 18 inches . . . . . . 1 foot. 



Trail, Pebbles and Clay in patches, verv contorted 



4 to 7 feet " . . . . 2 feet, 



Sandy clay with bones, 10 feet . . . . . . 7 feet. 



Fine sand and gravel, very false bedded, irons tained 



in places. 10 feet . . . . . . . . 20 feet. 



Blocks of light-grey sandstone with pebbles, and over two cwt. 

 in weight, occur in this pit. The pebbles seem to be derived from 

 gravels equivalent to those on Dartford Heath, and consist (besides 

 flint) of sandstone, quartzite, Sarsen, Bunter pebbles, quartz, 

 jasperoid flint, and Lower Greensand chert. Pieces of igneous rock 

 are present, and a pebble of Carboniferous Limestone with LITHO- 

 STROTION has been found (20). No Corbicula-bands can be seen 

 now, but were formerly noticed, as the Rev. 0. Fisher records that 

 the flake be found came from below them. 



At Buckley's Pit, The Avenue, Erith, large irregular sarsens are 

 found in Drift, which consists of false-bedded sand and layers of 

 flint-gravel 15 to 20 feet thick. A block of vein-quartz weighing 

 over 20 Ibs. has been found here. 



(20) Proc. Geol. Assoc., Vol. XV., p. 110. 



