Thermoluminescence of white powdered marble samples, chosen to display different EPR spectra, were studied. Two peaks at 280 o C and 360 o C can be observed among the TL glow curves while the EPR spectra exhibit two signals: the A signal with g =2.0038 and g =2.0024 due to the SO - 3 centre and the B one with g 1 =2.0005; g 2 =2.0001; g 3 =1.9998 due to mechanical powder reduction (drilling). Owing to heating and simultaneous experiments, a correlation have been established: the 280 o C TL peak is associated to the A signal and thus to the SO - 3 centre and the 360 o C TL peak is caused by mechanical treatment corresponding to the B EPR signal.