164 David Woolacott — Borings at 



These rocks came to the surface as loose dolomitic grains and were 

 recorded as " Sand " by the borers. 



Details of the Boring at Cotefield Close (Permian). 

 Altitude, 340 feet. 

 Boulder-clay, etc., 106 feet. 

 Middle Magnesian Limestone. Total thickness about 240 feet. 



a. Grey cellular and spongy limestone, the calcium carbonate^ 



having segregated out of a dolomitic rock, leaving cavities [Segregated 

 filled with soft yellow dolomite. Bands of crystalline j Limestone 

 calcium carbonate also occurred. About 85 feet. J 



/;. Soft yellow bedded dolomitic limestone. About 39 feet. 



c. Bed consisting of loosely cemented dolomitic rhombs. This bed"| 



was ground down and came to the surface as a yellow granular I Granular 

 sandy-looking powder, being called "sand" in the records. /"Dolomite 

 About 36 feet. J 



d. Dolomitic roestone, an oolitic limestone with geodes containing) Dolomitic 



crystals of dolomite and calcite. About 80 feet. J Oolite 



Lower Magnesian Limestone. Thickness about 270 feet. 



e. Soft and hard dense yellow limestone, with streaks and specks") y. i ., • 



of manganese dioxide (about 33 feet), passing gradually into I T 



/. Brown dolomitic limestone (about 118 feet), graduating by[y. , 

 alternating irregular bands into J 



g. A hard grey highly calcareous rock with carbonaceous partings. ~\ 



The surfaces between the layers were irregular and knobbly, a I Calcareous 

 peculiarity due to pressure solution. Parts of this rock had [-Lower 

 a brecciated appearance, being crowded wifh numerous Limestone 

 irregular fractures. About 100 feet. J 



h. Brown dolomitic limestone. About 20 feet. 



i. Hard grey calcareous laminated bed, resting unconformably on) Marl 

 Coal-measure Sandstone. 1ft. 3 in. / Slate 



Total thickness of Permian, 513 feet. 



Details of the Boring at Sheraton (Permian). Supplied by 



Dr. Trechmann. 



Altitude, 380 feet. 



Drift gravel and boulder-clay. 187 feet. 



Middle Magnesian Limestone. Total thickness about 213 feet. 



a. Hard whitish spongy brecciated calcareous rock, with small) 



cavities filled with powdery dolomite. About 90 feet. „ , , 



b. Brownish-yellow spongy-looking rock with small cavities filled r T • ±. 



with crystals of dolomite and calcite, a good deal of soft 

 dolomitic rock interbedded with it. J 



c. Dark yellowish-brown dense crystalline rock. 



d. Spongy-looking yellowish-brown crystalline rock, largely made\ Granular 



up of dolomitic rhombs. J Dolomite 



e. Yellow, dense, rather soft dolomitic rock, with many smalb 



irregular oolite grains and small cavities filled with calcite 

 crystals interbedded with hard brown thin bands without 

 oolitic structure, changing in places into a spongy looking rock. 

 /. Dark-yellow dolomitic oolite, with calcite-lined geodes. This 

 bed is very thick, and merges into 



I Equivalent 

 dolomites 

 on the west 

 " 1 f repf 

 exnosed 

 in Castle 

 Eden Dene 



Dolomitic 

 Oolite 



