Superposition: a Lexicon game
The phenomenon later termed the Abyss Effect was first observed approximately eight months prior to the Phobos Disorbital Event. At first a few and later hundreds of unexplained sinkholes appeared along the vicinity of Valles Marineris, Mars’ vast natural equatorial rift valley. The largest of these were up to eighty metres in diameter, but the majority spanned less than ten metres. The depths of those which could be accurately measured exceeded that of Valles Marineris’ maximum of 7000 metres, by as much as 80%.
No connections were made between the early instances of the phenomenon and the Superposition catastrophe until very recently, when Aresian seismologist Daryl Challoner reported similarities in patterns of radiological evidence at various incident sites.