Cover Photo: “Carbonate mound in the Wilkins Peak Member of the Eocene Green River Formation. Photo taken Between La Barge and Big Piney, northwestern, Wyoming. This carbonate mound represents boundstone lithofacies of the Lake Gosiute margin deposits, formed by stromatolite growth around a log in the center (core) of the mound. The empty space at the center of the mound was initially a large log which was the nucleus for carbonate growth and decayed afterward. Notice this mound rests on its side and not in place. These deposits can be correlated to the center of the basin using ash beds and Sr isotopes (see Baddouh et al., this issue).