Arkell.1956.Jurassic..

BURIED JURASSIC OF THE SOUTHERN UNITED STATES 569
and in SW. Alabama (that is, towards the north-east) this rises diachronically
and at the same time becomes thicker and coarser and contains
pebbles derived from the Appalachian Mountains, which are consequently
inferred to have experienced a revival of uplift at this time. 'It seems
logical to correlate the uplift of these mountains with the Palisade disturbance,
which formed block mountains from Nova Scotia to the Carolinas
sometime after the Upper Triassic and before the Upper Cretaceous'
(Imlay, 1943, p. 1474).
According to Swain (1949, p. 1250) the movements between Upper
Oxfordian and Lower Kimeridgian in the southern States were insignificant
FIG. 90.—Generalized horizontal section through the Jurassic and Cretaceous of southern
Arkansas and northern Louisiana, after Imlay. (From Journ. Paleont., 1941.)
compared with later ones which occurred at or near the end of the
Kimeridgian. In that case 'the most intense interval of uplift of Jurassic
time' (Swain) coincided with the Nevadan orogeny.
CUBA
Excepting only Kiogar in the Himalayas with its 'erratic blocks of
Malla Johar', no small Jurassic area in the world has proved so baffling
to geologists or produced so many conflicting interpretations as the Organ
Mountains in Pinar del Rio province in western Cuba. In the geological
literature on this region published during the last 35 years it is standard
practice for every account to contradict its predecessors on almost all
important points. The same formations have been declared to be
Palaeozoic, Jurassic, and LTpper Cretaceous, the Jurassic has been stated
to be 120 m. thick in one account and 10,500 m. thick in another; the
junction between the Upper Oxfordian and Tithonian has been interpreted
as a major unconformity demonstrably due to an important Jurassic
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