Transgression / Regression Stratigraphic Column List possible EOD On the stratigraphic column above and using the symbols on the previous page, draw the rocks in order they formed. Remember to put the rock formed from the first layer of sediment at the bottom. Once you have completed the column: 1. On the right side of the column, suggest possible depositional environments for each bed. Be more specific than just continental or marine. 2. How did you determine the possible EOD? What attributes of the rock did you use as clues? 3. On the left side, bracket and label the layers that represent a transgression and regression. 4. List three processes that could cause a transgression..