Copyright by Nysha Chaderton 2009 - The University of Texas at ...
Copyright by Nysha Chaderton 2009 - The University of Texas at ...
Copyright by Nysha Chaderton 2009 - The University of Texas at ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
element number 6 has the mostly deeply eroded base <strong>at</strong> this loc<strong>at</strong>ion with approxim<strong>at</strong>ely<br />
5 m <strong>of</strong> scour (Figure 2.15). Together the eight stacked channel elements form a channel<br />
complex in the sense <strong>of</strong> Campion (2000) (Figure 2.8 and 2.15). <strong>The</strong> upper portion <strong>of</strong> the<br />
outcrop is characterized <strong>by</strong> 10 m <strong>of</strong> lamin<strong>at</strong>ed silts, muds and rare sand beds th<strong>at</strong><br />
comprise Facies 6. It is possible th<strong>at</strong> more <strong>of</strong> this facies existed <strong>at</strong> one, time but was<br />
eroded. Thin bedded turbidite deposits th<strong>at</strong> overlie a channel complex such as those <strong>of</strong><br />
Facies 6 <strong>at</strong> this loc<strong>at</strong>ion, record an abandonment <strong>of</strong> the channel complex in space or time<br />
(Schwarz and Arnott, 2007).<br />
Chalky Mount Lower (CML)<br />
This section is loc<strong>at</strong>ed <strong>at</strong> the base <strong>of</strong> the prominent Chalky Mount Ridge.<br />
Although the contact between the two areas is obscured <strong>by</strong> thick veget<strong>at</strong>ion, it is thought<br />
to be a fault due to the appearance th<strong>at</strong> the entire Chalky Mount Upper package seems to<br />
have been thrust into place with beds <strong>at</strong> the southern end <strong>of</strong> the outcrop as the beds are<br />
almost vertical. <strong>The</strong> Chalky Mount Upper package is nevertheless still interpreted to<br />
overlie the Chalky Mount Lower <strong>at</strong> this locality. However, one must bear in mind th<strong>at</strong><br />
the upper part has been displaced some unknown distance from its original loc<strong>at</strong>ion <strong>of</strong><br />
deposition.<br />
Description<br />
<strong>The</strong> Chalky Mount Lower (CML) section is a large thickness <strong>of</strong> finer-grained<br />
sediments geographically loc<strong>at</strong>ed bene<strong>at</strong>h the Chalky Mount Upper section. However,<br />
the exact str<strong>at</strong>igraphic rel<strong>at</strong>ionship to the CMU is not known due to separ<strong>at</strong>ion <strong>of</strong> the two<br />
intervals <strong>by</strong> a thrust fault.<br />
<strong>The</strong> CML consists <strong>of</strong> 50 meters <strong>of</strong> continuous section characterized <strong>at</strong> its base <strong>by</strong><br />
several thicker bedded (20-70 cm), sharp-based, coarse-grained sands (Figure 2.16a-c).<br />
11