Arkell.1956.Jurassic..

CHAPTER 2
THE BRITISH ISLES
The British Jurassic having been summarized already (Arkell, 1933), the
present account is reduced to essentials for understanding the ammonite
succession as a basis for correlation elsewhere. The list of references
(p. 643) contains only items published since 1933 and consequently is
fuller than the lists for other regions of Europe, which are selections of
FIG 1.—Jurassic outcrops of the British Isles (black) ; proved and probable
concealed and submarine continuations stippled.
the most important sources published in the last hundred years. (For
British Jurassic bibliography before 1933, see Arkell, 1933.)
The British Jurassic rocks comprise a highly variable series of formations
laid down as shelf and trough deposits upon the Upper Triassic
Keuper lake beds and thin marine Rhaetic Beds. They reach a maximum
thickness of about 1000 m. in the south of England and in Yorkshire,
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