THEMIS image: Which came first?

THEMIS Image of the Day, February 26, 2014. Towards the top of this VIS image is a T-shaped depression and two sections of narrow channel. Fluids (like water — or in this case most likely lava) flow downhill. If the depression formed first, the channels would have flowed towards the depression from both sides and then emptied into the depression, likely forming a delta deposit on both sides. If the channel formed first, it was a single channel and the fluid creating it stopped flowing before the depression was formed. Analysis of… [More at link]