WOOD IN FLINT. 17 
studded over with little pyriform eminences, which are cre- 
_ taceous casts of perforations made by insects in the wood. 
These specimens, when all traces of the wood are absent, are 
_ very puzzling to those who are not aware of their origin. 
Occasionally silicified fragments of wood are found imbed- 
' ded in flint. I have an interesting specimen of this kind 
_ obtained from a wall in Lewes Priory (Lign. 58), and though 
it must have been exposed to the influence of the weather 
_ for nearly eight centuries, its surface still exhibits coniferous 
structure. 
TERTIARY ConrFERous Woop.—The Tertiary formations 
in some localities abound in coniferous plants and trees, 
_ which, in the Paris basin, are associated with bones of mam- 
malia ; several species of pine (Pinus) and of yew (Taxus) 
- from those deposits are described by M. Brongniart. I have 
collected fossils of this kind from the London Clay of the 
Isle of Sheppey, Bracklesham Bay, and Bognor in Sussex, 
and Alum Bay, in the Isle of Wight ; and from the plastic 
clay at Newhaven. | 
Fosstz Foutace and Fruit or Conirer#.—From this 
_ digression on the pine-forests and drift-wood of the secondary 
formations, we return to the examination of the foliage and 
fruits of this order of vegetables that are preserved in the 
mineral kingdom. 
ARAUCARIA PEREGRINA (Lindley and H utton). Lign. 59, 
jig. 1.—With the trunks and branches of conifers of the 
Lias, cones and foliage are occasionally found : a beautiful 
example of a branch with the leaves preserved, is figured, 
Lign. 59. This fossil has been so admirably cleared from 
the shale which invested it (by Miss Philpot) that even the 
Surface of the leaves is exposed. It so closely resembles 
a twig of Altingia excelsa, that the eminent authors of 
Foss. Flor. have named it as above. But M. Brongniart 
States that the foliage differs from that of the two living 
groups of Araucarie : in Araucaria Brasiliensis, the leaves 
3 
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