Geology Reference
In-Depth Information
Fig. 21.28
Stratigraphic nomenclature and facies stratigraphy
of the Cave Hill Member of the Kinkaid Formation in south-
western Illinois: The Cave Hill is an unconformity bounded
sequence (3rd-order cycles) on which, several 4th to 5th-order
shallowing-upward cycles are superimposed. The section is
composed of the lower 6.5 m of the lower Cave Hill Member
from locality 1 and the upper 18.5 m of the Cave Hill Member
from locality 2 (see Fig.
21.27
for the location of sections). Note
that small-scale peritidal cycles display progradational and
aggradational stacking patterns and comprise the bulk of the
highstand systems tract.
Black
and
gray triangles
represent
transgression and regression, respectively. Abbreviations:
HST
highstand systems tract;
mfs
maximum fl ooding surface,
SB
sequence boundary,
TST
transgressive systems tract
Creek and the Goreville Members (Fig.
21.28
). This
summary concentrates on a composite section (Fig.
21.27
,
localities 1 and 2) of the Cave Hill Member in south-
western Illinois.
The Cave Hill Member mainly consists of cyclic
peritidal deposits (Fig.
21.28
) related to an arid and
gently sloping homoclinal carbonate ramp similar to
the modern Persian Gulf. Peritidal facies of the Cave
