"Japanese" stepping stones:
As they are not adjoined to each other, the stones are simply secured in the ground.
If you use thick paving stones, they should be laid on a bed of sand; if you use thin stones it is recommended to pour a thin layer of concrete between the sand and the stones.
Patios or driveways:
The paving stones are laid on a layer of concrete that is poured over a foundation of gravel or crushed stone.
Sedimentary rocks are the result of the accumulation and compacting of mineral debris (i.e. other stones), organic debris (animal remains and vegetation, fossils), or chemical precipitation.
They are exogenous rocks, i.e. rocks which are formed on the surface of the Earth. Sedimentary rocks are present on 75% of the surface of the Earth's continents, but when considering its crust as a whole (from the surface to a depth of 22 miles (35 km)), they only represent 5% of its total volume.
The main sedimentary rocks are:
Mont du moulin 30750 Lanuejols FRANCE.