Stratigraphic Architecture
of Two Incised Valley Fills: Fiddler Creek and
Pederson, Keriann
H.1, David W. Bowen1 (1)
Fiddler Creek and Clareton
incised valley-fill trends, in the
Stratigraphic architecture is a
function of accommodation and sediment supply. Seldom are any sedimentary
controls constant thus allowing the other to be evaluated independently. The
two paleovalley systems that are the focus of this
study are exceptional in that they have common controls on accommodation, are
proximal, and similar in relative size. They differ in that Fiddler Creek
valley system is a coastal plain valley with limited sediment supply, whereas Clareton valley system is a piedmont valley with high sediment
supply. This allows the effects of different sediment supply rates to be
evaluated independently.
Data in the study area consists of
surface outcrops, greater than 6,000 wireline logs,
and numerous cores. This data facilitates continuous mapping of the valley
systems 75 kilometers down the valley axes. Multiple bentonite
layers are also present in each of the valleys; dating of these bentonites and their correlation between the valley-fills
aids in interpreting internal valley stratigraphy and
helps to establish subsidence rates for each
valley-fill.
Because of their similar history and the
plethora of data available for these two unique valley-fill systems, they are
ideal for studying the sediment supply control on stratigraphic
architecture in incised valleys.
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California