2. Helow are four stratigraphic columns from four different locations (A-D). Unfortunately, several erosion events have caused unconformities (squiggly lines) in the sequences. Your task is to reconstruct the complete stratigraphic sequence. Assume that the oldest rocks are on the bottom and the youngest are on the top. Draw in the complete strata in the blank column below. Each rock type is used only once (eight strata total)..