Memory is a central epistemic resource, yet the interactional organization of shared remembering is mostly unexamined. Drawing on a large corpus of video- and audio-recorded interactions in English and Russian, this paper explores a collection of over 50 cases in which participants are engaged in the activity of co-remembering. It displays that memory formulations are commonly employed as an evidential method to legitimize or back a claim or perspective in contexts of challenges, objections, disagreements, skepticism, resistance and when alternative positions are on the floor. This study shows that in using memory formulations, interactants depend on the robust character of excavatable shared past experiences to provide an upgraded epistemic claim to back a contentious stance toward an alternative position.