To hard to make out with these shots..
There is something where you noted the First Drop-ship, it has like a Stone Henge look to it.
Options are...
1) Just Production Crew and Stuff that the Main Movie Cameras dont pick up but the Cameras the Cast have on them has , that is just a oversight as these Found Camera Footage shots are just few frames a time, that we are really not expected to look into so deep and notice a few things in them.
2) This is some area near another lake that has some other Structures in the Back Ground.
3) Indeed the Wreckage of the First Drop Ship, which means this Shot is taken after the Drop Ship Blows up, and so at least a Whole Day or a good Half a Day after the Drop Ship Blows up, in which time we see the Neomorph Ambush, the Crew finding the Ruins of the City and Burnt Engineer bodies.
I will try and analyze these by matching up the Cast, this will narrow down when this shot happens.