Just after I wrote my answer to dschultz under my last post about why I am inflicting the double-dig torture on myself with my heavy clay soil, I went to my garden to till another row on the potato patch, when suddenly the garden fork hit resistance just barely 10 cm under ground. As I do in such a case, I tried to reposition it to work around the obstacle, expecting it to be a larger stone or maybe a half brick. Occasionally, I dig out even a whole brick, and the biggest thing I dug out so far was a ca 30×40 cm phyllite paving stone. But I could not find the edge, and when I did, I could not get the fork deep enough to lever the seemingly big thing out. Then I managed to pry several small pieces off.
It turns out that just under the surface were buried several white tiles. I did not think much of it at that moment; an occasional tile or a piece of ceramics is not uncommon. And I continued to search with the fork and pry the tiles out.
Then a whole stack of tiles came out, and several more after that. At this point, I decided to put the tiles into a separate bucket.
I thought, maybe I will fill the whole bucket, and I did not want these tiles to be completely mixed with the stones I sort out of the soil, because the tiles are not as useful as, for example, road pothole filler. I was wrong about the bucket.
I almost filled two 10-liter buckets with these pure white tiles. There were several stacks buried in that place. And, funnily enough, it appears they were at the edge of the onerous piece of land. After this, the soil became suddenly less stony and much easier to till.
I already had proof that I was not working on a natural topsoil, but these tiles are definitive proof that something other than grass was on this piece of land before my time, probably before my grandfather got the house after WW2. I do not have a way to identify the age of the tiles. I did not look for any manufacturing markings yet, but they are definitely older than 50 years, since my whole life there was nothing but grass in this part of the garden.

























