!Lab 4 Biostratigraphy_Answer Sheet
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2024
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Geology
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Apr 3, 2024
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GLY 3105C –
Lab 4 –
Biostratigraphy Exercise 1 –
Lithostratigraphic and biostratigraphic correlation 1.
Complete the litho- and biostratigraphic correlations on the base map (separate download) to complete this activity. 2.
Why are fossils important for correlating sedimentary strata? In other words, what information do fossils provide that assists in correlating sedimentary layers from locality to locality? 3.
What intervals of geologic time were times of relative high sea level (transgression) here that flooded much of the modern coastal plain? (
hint: limestones represent deeper water than sandstones or mudstones)
4.
What intervals of geologic time were times of major sea level fall (regression) here? 5.
Which unconformities appear to be angular unconformities? 6.
Why are there sediments currently exposed above sea level on the Atlantic Coastal Plain?
GLY 3105C Lab 4 –
Biostratigraphy 2 Exercise 2 –
Subsidence Calculations 1.
Calculate the average rate of subsidence at each well location. The thicknesses of each section were estimated using the vertical scale provided with section T1-b. The ages of the strata at the bottom of each well are given below. Thickness / Age = Subsidence Rate (ft / m.y.) Core Age Thickness Subsidence Rate (include units!) T-1a 85 my 352ft T-1b 90 my 375ft OT-11 135 my 1424ft OT-30 140 my 2376ft 2.
Plot subsidence rate vs geographic location on the graph below. T1a T1b OT-11 OT-30 20 18 16 14 12 10 8 6 4 2 0 3.
Describe how subsidence rate changes going from onshore to offshore. 4.
Why are the ages of the oldest (first-deposited) strata different at the bottom of some wells? Subsidence rate (ft/my) Core location
GLY 3105C Lab 4 –
Biostratigraphy 3
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