ASBOG Practice Exam

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What types of features can assist in reorienting stratigraphic sequences?

Asymmetrical bedding, climatic events
Depositional features related to wind, grain size
Random sedimentation, ancient life forms
Uniformitarian features, continental drift

The correct answer is: Asymmetrical bedding, climatic events

Asymmetrical bedding and climatic events are critical features that can assist in reorienting stratigraphic sequences. Asymmetrical bedding indicates variations in sediment deposition that can occur due to changes in energy or direction of the depositing medium, such as water or wind. In stratigraphy, recognizing the orientation of these beds can help geologists infer past environmental conditions and the influences that shaped the depositional landscape. Climatic events, which can lead to significant changes in sedimentation patterns, also serve as markers within the geological record. These changes may result in distinct layers of sediment that correspond to specific climate conditions or shifts, allowing geologists to identify and correlate stratigraphic sequences across different locations. Together, these features enable geologists to piece together the history of the Earth's surface, providing insight into the dynamics of geological processes over time.