Copyright by Nysha Chaderton 2009 - The University of Texas at ...

MAB locality
S3 beds of Facies 3 along with Tb, Tc beds and Te beds of Facies 5 are the most
common individual beds observed at this location. Channel fill facies associations are
dominated by stacked Facies 3 coarse grained beds within the system that overlie erosive
channel bases. The channel margin facies associations are comprised of thin bedded
turbidites of Facies 5. Because the beds at this outcrop are almost vertical, lateral
relationships cannot be determined. This section is a vertical succession of alternating
channel fill and channel margin facies associations (Figure 2.35).
Turner’s Hall Ridge
Description
This location consists of ~ 70 m of continuous exposure. Because there appears to
be little lateral variation in lithology or bed architecture across the 60 m width of outcrop,
only one section was measured to characterize the location (Figure 2.36). Sandstone beds
vary from medium-grained (Figure 2.37) to fine-grained and are thickest at the base of
the section with a maximum thickness of 420 cm. Sand beds are capped with ripple-
laminated, fine-grained sands and silts. Minor loading and planar lamination is observed
through out the section. There is no very coarse-grained sand or conglomerate component
and no erosive bases were observed.
The first 20 m of the section is dominated by S3 (Facies 3) beds that are
interbedded with Tb, Tc and minor Td beds (Facies 4 and 5). Up section S3 are rare and Tc
and Td beds make up the bulk of the section. (Figure 2.38 a-e). This section is distinct
from the Chalky Mount Shale Ridge and Lower Walker’s Ridge sections as it has a
higher sand content, but does not show the scoured bases, intermittent very coarse
grained sands seen at the other two outcrops.
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