Valles runs north into Gusev crater, near the equator and not far
from the huge volcanoes. Kasei Valles runs north of Valles Marineris.
When compared to the positoning of phyllosilicates and water ice
in the crust, these huge floods correspond to the epicentres of
increased volcanic activity on my Earth to Mars contraction model
i.e. the Central American plates to Tharsis shield volcanoes, and
the Indian plate to Valles Marineris.