Mare Nectaris

lunar nearside. The basin material is of the Nectarian, and Lower Imbrian epochs, with the mare material of the Upper Imbrian epoch. The crater Theophilus, on the northeastern side of the mare is of the Eratosthenian epoch. Thus, the crater is younger than the mare to its southeast. Montes Pyrenaeus borders the mare to the west. The crater Fracastorius can be seen at the bottom of the photo. The mare material is approximately 1000 m in depth. Enough subsistence has occured to open a few arcuates grabbens on the western margin of the mare.The crater