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^nlxiirs. 
A. RENDLE SHORT, B.Sc. 
'HE first step in reading the history of the Grully is to 
■A determine the succession of rocks. Fortunately they 
differ extraordinarily in their lithological structure, and are 
quite easily recognizable wherever they crop out. They 
may best be studied in the old quarry at the bottom of the 
Grully, and on the railway line adjoining. 
The succession is (in descending order) — 
Middle Limestone Shales. 
A. Near the top, a thick band of limestone very like the 
Grully Oolite, but with the granules less regularly packed. 
B. Thick bedded and thin bedded limestones, with inter- 
vening shales. In the lower part the grain is very charac- 
teristic, the limestones being very white externally where 
weathered, and showing on the fresh surface a dark grey- 
black perfectly homogeneous structure, without granules 
or fossils. This band is very hard, and has a splintery 
racture. 
C. A band about two feet thick, with a yellowish exterior, 
the fresh surface being dark, rough, and showing rather 
small plates of dark calcite. ^2 feet. 
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