Figure 38.

Map showing the distribution of the first lava flow unit (blue) and its relationship to the Rio de Flag/San Francisco Wash drainage system (red line). Note how the Rio de Flag is deflected to the south along the flow edge, and how the San Francisco Wash appears to resume its original path from the middle of the eastern edge of the lava flow. Paleo-Rio de Flag/San Francisco Wash drainage is shown by the Dashed black line.