Page 299 - Carbonate Facies in Geologic History

286 Shoaling upward Shelf Cycles and Shelf Dolomitization

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STANDARD MIDDLE JURASSIC
SEQUENCE
S. E. PARIS BASIN

Fig.X-4. Standard Middle Jurassic sequence of the southeast Paris basin. Drafted at Labora-
tory of Comparative Sedimentology, Fisher Island, Miami, Florida-see also Figs. 5 through
8. Courtesy ofB. Purser (1972)

Fig. X-5. Index map of the
southeast Paris basin. Cir-
cles in basin represent oil
tests penetrating Middle
1urassic. Courtesy of B.
Purser (1972)

onian, and Callovian (Fig. X-4). The cycles resemble those in certain Liassic beds
of Lorraine and England (Kliipfel, 1917; Hallam, 1964). They are each a few tens
of meters thick. A lower argillaceous, thin-bedded bioclastic unit with brachiopods
and crinoids, and in places spiculitic and pelletal like the Lodgepole, is overlain
by a thicker middle unit of strongly cross-bedded oolite consisting of well-formed,
multiple-coated ooids. Foreset beds off sand bars up to 10 m high can be seen and
festoon cross-bedding occurs with troughs some meters deep and tens of meters