Examine the diagram below, which is a diagrammatic sketch of geologic features exposed in cross section in a deep river canyon
Write a paragraph that summarizes the geologic history at this locality, using the letter labels to describe the different rock units. Your history should be chronological, starting with the first event and ending with the most recent. Identify unconformities where they exist.
What will be an ideal response?
Please note error in drawing—"M" in the magenta igneous intrusion ("T"), which should have a line pointing toward the xenolith.
Formation of parent rock for M
Metamorphism to form M
Intrusion of T
Faulting of T by fault F1
Deposition of Y, H, D
Intrusion of Z
Tilting/folding of M, T, F1, Y, H, D, Z
Erosion to form a flat surface
Deposition of P, G, A
Faulting by fault F2
Tilting of all rocks that formed to this point
Erosion to form a flat surface
Deposition of S
Erosion along river through S and A
Deposition of B in river channel
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