T. V. Holines—Geology of Blackheath and Greenwich. 215 
of the Woolwich Series beneath, nowhere formed any serious obstacle 
to making the shafts. As regards shaft 3, in making which no water 
appeared, Mr. Cass stated that 1¢ was sunk some months later than 
Nos. 1 and 4, which were almost finished when No. 3 was begun. 
The details of the sections in shafts 2, 3, and 4 are here given :— 
Suart No. 2. 
Thickness. Depth. 
fis sane Tip dial 
Soil alate rs (0) Ho 
Blackheath | Loamy gravel ... 24 0 25 0 
Pebble Beds. | Yellow loamy sand 8 -@ 34 6 
White sand 4 6 39 0 
Shell deposit i @ 40 9 
{ Blue clay 3.9 44 6 
Woolwich Beds.- Pebbly sand 2410, 46 6 
Blue clay 0 6 AY 
Loamy sand and pebbles 6 0 53 0 
Thanet Sand. Whitesand  ... Hae spon 23. GB 101 6 
Black sand and flints ... ae eed IG 102 6 
Chalk. Bottom of shaft 123 ft. 3 in. 
Suart No. 3. 
Soil ie 1 0 i @ 
Blackheath | Loamy gravel ... g © 10 0 
Pebble Beds. | Pines sand OBO) 33000 
Loamy sand 5 0 38 0 
Shell deposit i 39 0 
[Team sand © & 3959 
; Shell deposit 1 9 AN) 
Woolwich Beds.- Welles ie 3 9 45 3 
Hard mixture of clay, sand, and d pebbies 7 9 53 0 
Green sand nae 0 9 53 9 
Thanet Sand. White sand a 48 9 102 6 
Black sand and flints ... iL © 103 0 
Chalk. Bottom of shaft 123 1{t. 3 in. 
Suarr No. 4. 
Soil ate 0 6 0) 
Dirty ballast 9 6 10 0 
Yellow clay I 6 ili © 
Blackheath Ballast ... 4 6 16.0 
Pebble Beds. "\ Loamy sand 8 0 24 0 
White sand NES Oy 3 
Loamy sand i) 30 11 
White sand Wo BS) ots} 
leas sand i ete 40 8 
r . WV hite san as 4 9 45 5 
Woolas Lai: Hard mixture of clay, 8 5 sand, and ed pebbles 4 0 49 5 
Green sand are 3 @ 52 9 
Thanet Sand. White sand ; ae 48 1 100 6 
Black sand and flints ... 10 101 6 
Chalk. Bottom of shaft 119 ft. 9 in. Li 
If we compare the sections in these three shafts, we find that while 
the Thanet Sand is of the same thickness and character in each, and 
there is nothing peculiar in any of them as regards the Blackheath 
Beds, the Woolwich Beds are nearly alike in shafts 2 and 3 and differ 
noticeably from those of No. 4. On noting the absence of any ‘‘ shell 
deposits” in the Woolwich Beds of No. 4, I wrote to Mr. Cass asking 
