Stratigraphic sequences in the North Carolina Coastal Plain delineated from well data
Rick Diecchio
, George Mason University
Author ProfileSummary
3-D visualization xercise to construct a stratigraphic cross-section and a correlation diagram to identify unconformity-bounded sequences, then to recognize the sequences on a geologic map.
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Context
Audience
upper-level undergraduate course for geology majors
Skills and concepts that students must have mastered
would help if they have constructed a stratigraphic cross-section, but this is not essential
How the activity is situated in the course
mainly as a visualization exercise to illustrate the sequence concept
Goals
Content/concepts goals for this activity
stratigraphic correlation, unconformity-bounded sequences, realization of time-rock units, geologic map reading
Higher order thinking skills goals for this activity
visualization in 3-dimensions
Other skills goals for this activity
Description of the activity/assignment
Students are provided with well data in the form of chrono-stratigraphic (time-rock) units, and their depths in each of 3 wells oriented normal to depositional strike. Preparation of a cross-section necessitates recognition of major correlative unconformities. Preparation of a correlation diagram (vertical axis = time) illustrates the spatial and temporal extent of each unconformity and sequence. Sequences are more complete seaward, and unconformities are more extensive landward. Students can apply this information to the North Carolina Geologic Map where each sequence and unconformity may be recognized.
Determining whether students have met the goals
cross-section and correlation diagram must follow occam's razor, and must be graphically consistent with each other. student should be able to visualize the sequences and unconformities on a geologic map.
More information about assessment tools and techniques.