Arkell.1956.Jurassic..

CUTCH 385
favoured locality in the world for Upper Jurassic ammonites, by reason
of abundance, good preservation and ideal exposures. The Upper Jurassic
rocks form an island world rising partly direct from the shallow sea and
marshes (the Rann) and partly from alluvial lowlands, with a fringe of
Deccan traps and Tertiary sediments along the south side. The islands
represent the remains of three E.-W. anticlines corrugated by minor
transverse folds to form irregular domes. Within the domes erosion has
exposed successively lower formations in a series of small concentric
scarps.
The southern anticline, in which lies Bhuj, the capital of Cutch, is the
largest and most complete, with a length of 120 miles. Owing to a longitudinal
fault on the south side much of it is repeated in the adjoining ridge
FIG. 55.—Map of the Jurassic and Lower Cretaceous outcrops (not differentiated)
in Cutch.
of the Charwar and Katrol Hills. The central mass of Wagur, lying to
the NE., is 50 miles long from east to west and is possibly continued
beneath the Rann. The northern anticline has been reduced to four
separate domes more or less completely islanded in the Rann, but still with
a total length of nearly 100 miles (fig. 55).
The Upper Jurassic rocks are of neritic marine facies and contain
many formations crowded with mollusca, especially ammonites and
pelecypods. The exposed and fossiliferous part ranges from lowest
Lower Callovian (with Macrocephalites) and probably some Upper
Bathonian (without ammonites) at the base, up to Lower Tithonian,
and is succeeded by a great thickness of sandstones and shales of continental
facies, with plant beds and at least two marine horizons, one
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