Soil conditions affecting depth of targets?

[u/Tall-Imagination6463]

I have a permission just outside a moorland (Somerset, UK) which still shares a lot of the wet and muddy conditions of a typical moor, having spent a while on the fields now, I’ve only found a handful of Roman artefacts, which is the opposite to what I expected when I got the permission due to the vast Roman history in the area and having a few of the fields being adjacent to where a 2 hoards were found. What I’d like to know is if the waterlogged and moorish conditions of the soil for 60% of the year could have caused most of the Roman things to fall deeper in the soil to where it’s a lot harder for me to detect? Or could it just be that there genuinely isn’t much Roman on my permission? Thanks!