What are the sub divisions of the Tripitaka and what do these areas cover? Is it possible to list out the section of the Tripitaka summarizing what areas they cover.
Since I don't know how deep in the Tipiṭaka's structure you want the answer, I'll try to give the most in-depth answer. I'll present the structure in a tree chart and, beneath it, I'll refer to an article with an in-depth analysis of the canon which provides the summaries. 



Structure

(Click to enlarge)





Summaries

Summaries are provided in "Chapter I: Textual Analysis of the article "An Analysis of the Pāḷi Canon" by Russell Webb. It also contains an excellent index of the canon, and an extensive bibliography.