A Brief Introduction to Sequence Stratigraphy

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A Brief Introduction to Sequence Stratigraphy
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The Sea Level Record
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Highstand Deltas of the East Texas shelf
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Main Surfaces1. Sequence Boundary2. Maximum
Flooding Surface3. Transgressive Surface
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Systems Tracts
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Seismic and Chronostratigraphy(Oxygen isotope
stratigraphic analysis and biostratigraphic
analysis used to relate surfaces and the systems
tracts they bound to sea level curve)
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Contrasts in Stratigraphic Architecture
(http//gulf.rice.edu)West Florida
Margin(Steep, ramp-like profile,low subsidence,
bedload -dominated rivers)1. Sandy, late
highstand deltas dominate2. No lowstand
delta/fan3. Extensive transgressive sheet
sandWestern Louisiana/Brazos/Lagniappe
Margins(Broad, low-gradient margins,
moderatesubsidence, high sediment supply
rivers)1. Dominance of late highstand deltas2.
Sands in channels and mouth bars3. No lowstand
fansEast Texas-Trinity/Sabine Margin( Broad,
low-gradient margin fed byrivers with moderate
sediment supply)1. Re-incision of valleys
results in significant shelf bypass and fan
nourishmentEast Texas-Colorado Margin(Broad,
low-gradient margin, moderate sediment
supply)1. Sands occur in late highstand,
lowstand and transgressive deltas and in
lowstand slope fansCentral Texas Margin(Steep,
ramp-like margin with moderatesubsidence, rivers
with low sediment yields)1. Sands mostly
confined to highstand andconsist of
strike-oriented shoreface deposits.2. No
lowstand deltas or fansSouth Texas
(Rio-Grande) Margin(Broad, low-gradient margin
with moderatesubsidence)1. Extensive, sandy
highstand, lowstand andtransgressive deltas and
lowstand slope fan