216 Review of ‘* Outlines of the 
generally nearly horizontal ; but not always, as the follow- 
ing extract will show. 
**But crossing to the Isle of Wight, the chalk re-emerges 
from the superstrata near its eastern point, and rises with 
its usual magnificence into Culver Cliffs. Here, indeed, 
vourable in some places, ere Vineyard,) that we 
it would justify an exploration by boring: 
of beds of siliceous sand, which probably have an aggregate 
thickness in the greater part of their course of not less tha? 
1,000 feet and form that extensive sand tract which is uni- 
terminations of the chalky ranges.””—p, 11. 
*he subdivisions of this series are 1. Chalk Marle ; 2 
Green Sand; 3. Weald Clay; 4. Tron Sand. 
The chalk marle consists of cretaceous, argillaceous, and 
sandy matter, often sufficiently consolidated for architectu- 
ral purposes, and a forming a fine grained gray 
ston re. its minerals are iron pyrites; 
septaria, calc. spar, selenite, and sulphate of lime ee its 
fossils (all of marine origi 
wood, zoophites, and testaceous mollusce. 
