You are wrong! You cannot date Sedimentary strata using K-Ar dating method. What are dated are the igneous rocks by K-Ar dating method. You said it yourself, Igneous rock is formed through the cooling and solidification of
magma or
lava. -wiki
If they can date igneous rock with K-Ar dating method, then they can date the strata, and that’s how they date fossils by dating the igneous rocks first, and that’s how they date the strata by dating igneous rocks first. It’s a circular dating method base on Index Fossil.
You are just like this guy who does not know what he is talking about.
Sedimentary strata could have come from everywhere and therefore cannot be dated.