ON THE CIRCULATION OF UNDERGROUND WATERS. 



301 



Wiltshire. 



Boring at Gas Works, Fordinghridge, Salisburi/, 1887, bi/ Messrs. Tilley. 

 Details furnished by Messrs. Tilley and E. Westlake, F.G.S. 



Soil- 

 Black mould ........ 



Biver gravel — • 



Broken snbangular gravel in a good deal of sand . 

 Lower Bagshot (Base of ?) — 



Fine gre.y quartz sand, clayey in places 

 London clay, 118 feet — 



Grey sandy clay 



Sand and pebbles 



Hard stifE clay 



Sand, with pebbles at the base .... 



Sandy clay 



Septarium containing fossils, Turritella imdrica- 



taria, kc. ........ 



Clay 



Hard stone 



Dark clay 



Dark clay with shells, probably Pholadomya 



Dark bluish clay 



Hard stone 



Dark bluish clay with a few small pebbles — 



Cardita planicosta, Bostellariu lucida, Sow., 



Turritella imhricataria ..... 



Hard stone 



Clay 



Brown clay, very hard and compact 



Septarium (met with at same depth in both 



borings) 



Sand and clay, with water under the stone . 

 Sand and water ....... 



Sandy clay 



Sand, shale, and pebbles (Basement bed 1 Doubt- 

 ful if pebbles are more than 6 inches thick) 

 Eeading Beds, 7i feet — 



Light grey clay laminated with grey sand . 

 Greenish-brown loam with a little glauconitic 



sand and lignite 



Buff-coloured calcareous stone, 4 inches 



Light brown cla}' ....... 



Brown clay ........ 



Mottled clay, 31 feet— 



Whitish-grey or pale green clay, with occasional 

 streaks of red ..... 



Light grey pipe clay 



Bed clay 



Yellow clay, greyer towards the base 



Dark-brown or chocolate-coloured clay 



Purple clay streaked with ochre 

 Marl, 9 feet — 



Pale bluff-coloured marl .... 



White highly calcareous marl . 



Pale green or olive-coloured marl with small 



calcareous lumps ..... 



Greensand (glauconitic quartz and iron grains) 



with oyiter shells ..... 

 Chalk 



Thickness in 

 Feet 



12 



14 



4 



2 



14 

 1 

 3 



8 



10 



7 



Depth in 

 Feet 



U 



20 



138i 

 144i 



156 

 1561: 

 160 

 162 



176 

 177 



180 

 188 

 190 

 193 



196 



200 



202 



212 

 219 



