According to NYU, "Posters are widely used in the academic community, and most conferences include poster presentations in their program. Research posters summarize information or research concisely and attractively to help publicize it and generate discussion" (NYU poster information; http://guides.nyu.edu/posters).
That's what you will find in the new section on this website titled "Academic Posters." To date, only two posters are in this section, but only one of them is published. The published poster (Rock-cut Chambers on Mt. Raitano, Sicily) was presented at the annual conference for the American Schools of Oriental Research, and can be found both here and on Academia. The second (Mycenaean Tombs or Grain Silos? The Mt Raitano Excavations 2014) was created for the conference but then changed due to political reasons. You can still find it in the poster section, though!
So, how do academic posters work?
Looking back to NYU, "The poster is usually a mixture of a brief text mixed with tables, graphs, pictures, and other presentation formats. At a conference, the researcher stands by the poster display while other participants can come and view the presentation and interact with the author" (NYU poster information; http://guides.nyu.edu/posters).
That is what you will find in both of the attached posters. Since I can't very well stand next to my posters to field questions, please feel free to ask questions in the comment section below.
My fellow Field Directors working with me on this project were Jared Wilson and Micah Johnson. Jared published the poster with me, and the three of us are publishing the field report this coming spring semester (In'Shallah).