Geology Reference
In-Depth Information
Fig. 20.22
Representative outcrop photos of a non-oolitic
tidal sand unit, the Mississippian Salem Limestone, near St.
Louis, Missouri. (
a
) Current ripples in a foraminiferal grain-
stone. Hammer handle in bottom center for scale. (
b
) Muddy
bottomsets on small trough cross-bed set. Some muddy layers
are highlighted by
arrows
. (
c
) Paired uninterpreted (
upper
) and
annotated (
lower
) photos of a cross-bedded interval overlain
by a dolomitic muddy unit. The cross-bedded unit includes a
set of laminae (some highlighted by
red lines
) stacked into
bundles (
blue lines
), some of which may include muddy toe-
sets. Sets of bundles are separated by thin (<4 cm) muddy lay-
ers (
yellow lines
)
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Indiana Geol Surv Bulletin 48, 81 p
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ates. Am Assoc Petrol Geol Mem 69:211-229
and the vigorous tides impacting these platforms.
Many ancient systems include what appear to be
tidal sands but are not oolitic. How do the sedimen-
tology, geomorphology, and diagenetic character of
these systems differ from their oolitic relatives?
Clearly, many important and interesting questions
regarding tidal sand shoals and their geologic record
await future study.
References
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