primeval ruin

hi,

i'm looking for this ruin, is it a pattern for the different ruin ? how they spawn ? distance between ..etc

i'm at 380 deep, and i try like this:

https://www.noelshack.com/2019-12-4-1553185848-mine.png

pattern ? or totaly random ?

well , just found ruin.

so my research based on distance between 2 ruin (outpost or whatever).

i mean that distance is most of the time the same.

so my delve:



on the screen, blue circle are vaal outpost, and on green the primeval.
the orange line mark distance, and the red circle, where i mean to found some ruins (vaal or other).

my 50 cent :)