Dear Mr. Afenzar: You have to investigate in more detail your red bed sediments and clearly distinguish between cement minerals, which are autochthonous and amenable to radiometric dating given they contain K, U, Th, and Rb such as some micaceous phyllosilicates, cryptomelane or uranyl-bearing supergene minerals. The majority of mineral phases might be of detrital origin which have only some implications on the lithological processes in the provenance area and give you a maximum age of formation which has very little meaning for your problem. Lithostratigraphic correlation with other strata of a defined age of sedimentation is possible but needs a lot of experience because you have to take into consideration lateral facies changes between the two.

I wish you much success

H.G.Dill

Dear Harald G. Dill thank you very much for your feedback

so if I understood your suggestion, these radiometric dating will not give the precise age of these sediments.

for the second proposition, can the correlations in terms of genetic stratigraphy give a precision?

Minerals which formed in-situ reflect processes intrinsic to the basin evolution and they are suitable for radiometric age dating. Lithostratigrphic correlation, is fraud with difficulties

Exactly, the lithostratigraphic correlations are not reliable.

I know that radiometric dating is the most recommended for this type of study.

so my need is the techniques to apply as well as the means to do it.

in any case, I thank you dear H.G.Dill for your answers and your interesting scientific advice. I appreciate it.