Sorry, you obviously have no understanding of geological formations, or the necessary elements for fossilization.
Again, do you have any geological or anthropological evidence of a Great Worldwide Flood. Do you have ANY evidence AT ALL of a Worldwide Flood occurring in the last 10,000 yrs?
Chalk and limestone are a form of fossilized calcite plates.
Slate is mainly composed of quartz and muscovite or illite, often along with biotite, chlorite, hematite, and pyrite and, less frequently, apatite, graphite, kaolin, magnetite, tourmaline, or zircon as well as feldspar.
Most sandstone is composed of quartz and/or feldspar.
But silica sand is what is usually used in concrete, not sandstone.
As all of the above, are formed from either prolonged weatherization and/or depositing,, or intense pressure, millions of years are usually involved.