create a harris matrix

Stratigraphic analysis is about trying to understand the chronological order in which features and strata were deposited. Your task for this exercise is to place the letters (representing the strata and features they label) in stratigraphic order. Be aware that some of the letters will represent features and strata that may have been deposited at the same time (contemporaneous), or that you will be unable to understand association among certain features and strata due to the fact that they are not stratigraphically connected in the profile