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Examples of Unconsolidated
In this district there are numerous fossil shells which have decomposed, having for the most part left only their casts.
Proofs of a similar cementing action are seen in a rock at Kelloway, in Wiltshire.
There are also proofs, during the same recent period, of a permanent alteration of the relative levels of the land and sea in several places, and of the same tract having, near Puzzuoli, been alternately upheaved and depressed to the amount of more than twenty feet.
Lava-currents have also flowed upon the land and along the bottom of the sea- volcanic sand, pumice, and scoriae have been showered down so abundantly that whole cities were buried- - tracts of the sea have been filled up or converted into shoals- and tufaceous sediment has been transported by rivers and land-floods to the sea.
Nothing is more remarkable than the usual parallelism of the opposite sides of the dikes, which correspond almost as regularly as the two opposite faces of a wall of masonry.
Crystallisation, beginning at the centre, must have gone on forming concentric coats around the original nucleus without interfering with the laminated structure of the rock.