Arkell.1956.Jurassic..

432 INDOCHINA AND INDONESIA
of Mesozoic palaeogeography. If, as is supposed by current theory, the
Sunda arc with its adjacent deeps is an embryo mountain range advancing
against the foreland of Australia (or Australia an advancing shield underthrusting
the arcs), the whole area must be still plastic. The repeated
orogenies of the past must have produced tremendous distortion, the history
of which perhaps can never be unravelled.
FIG. 65.—Sketch-map to show position of the Jurassic outcrops in Sumatra,
Borneo, Indo-China and Hong Kong.
From at least the Oxfordian to the Tithonian the trough of deposition
in eastern Indonesia and New Guinea was in direct communication
with that of the Himalayas, as is attested by identity of faunas. At least
two of the three subdivisions of the Spiti Shales, the Oxfordian Belemnopsis
gerardi Beds and the Lochambel Beds, with identical Buchia
[Aucella] and coarse-ribbed Inoceramus shells as well as ammonites, are
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