Since the last report, Opportunity has driven into the next valley to the south, which we have informally named "Bitterroot Valley." On this sol, Opportunity is finishing up observations on the first outcrop target of its 10th mission extension plan. In this two-year plan Opportunity will explore the lower inner walls of Endeavour crater. It will then climb back out to the west and south while exploring the stratigraphy and structure of the crater wall, and then drive south along the rim. Later in the year the plan is for Opportunity to drive back into the crater, following the floor of a fluvial channel cut in the rim of the crater. If Opportunity is able to follow this plan, this will be the first drive inside a known fluvial channel on Mars. The results should be interesting.

Meanwhile, Opportunity is exploring an unusual knob here on the lower inner wall of Endeavour crater, informally named "Spirit Mound." We are using a Lewis and Clark naming theme for features and as Opportunity drives south—we will use names from towns along the route taken by Lewis and Clark in their journey westward. Right now the strange knob is "Spirit Mound", which is appropriate both because it is a name from the list of places along the Lewis and Clark route but also because it honors the memory of Spirit rover in a way.