I expected age between present up to 100 years. I heard U-Th is useless in this case. If you have any idea let me know, please.
You can use Optical Luminescence dating and Thermoluminescence Dating. But you have to take samples according to procedure.
Best of luck
Regard
Rahman
Electron-Spin-Resonance- (ESR)-Dating and radio-carbon dating.
HGD
The radionuclide 210Pb is suitable for century-scale dating and has been used to calculate the sedimentation rate in a variety of environments.
https://link.springer.com/article/10.1007/s13131-018-1214-4
Radiometry and Fossils
Optically stimulated Luminescence can assist you to determine the rock beach age, provided you follow the appropriate sampling plan.
Depending on the morphology, depth profile exposure dating using cosmogenic 36Cl might work for the whole accumulation.
All of these methods are good but you take care about the sampling method and had better sampling by an expert.
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