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Radiocarbon dating can be used on sediments or sedimentary rocks that contain carbon, but it cannot be used on materials older than about 60 ka.
K proportion of 0.95, which is equivalent to an age of approximately 96 Ma.
Because it is present within the atmosphere, every rock and mineral will have some quantity of Argon.
The red-blue bars represent 40K and the green-yellow bars represent 40Ar.
[SE] In order to use the K-Ar dating technique, we need to have an igneous or metamorphic rock that includes a potassium-bearing mineral.
If we dated a number of individual grains in the sedimentary rock, we would likely get a range of different dates, all older than the age of the rock.
It might be possible to date some chemical sedimentary rocks isotopically, but there are no useful isotopes that can be used on old chemical sedimentary rocks.