I D B
Describe the geologic history of the cross-section shown below. Note any unconformities that may be present and what type they are. Includes faulting and folding events. List from the oldest event to the youngest event on the lines below.
In the given geological cross-section, several beds are present. Here, we can see that there are both folding and faulting episodes.
Applying the Law of Superposition, we can conclude that bed H is the oldest followed by bed G, bed F, bed E, and bed D. Then an episode of folding affected beds H, G, F, E, and D. After that Faulting has taken place along Y. The folded beds have been displaced due to the fault. Though from the given image, we cannot confirm whether bed D is affected by the fault. After all these events, an igneous intrusion A has taken place which has been emplaced above beds H, G, F, E. Then there was the deposition of bed C followed by the deposition of bed B. Bed B is the youngest. There lies an unconformity (which is denoted by I).
Bed B Youngest
Bed C
-Unconformity (I)-
Igneous intrusion (Bed A)
-Faulting-
-Folding-
Bed D
Bed E
Bed F
Bed G
Bed H Oldest
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