Fish fossil from Ceara State, Brazil has been investigated using thermoluminescence and EPR method. In both cases, additive method has been used by irradiating fossil samples to very high doses (tens of kGy). In the case of thermoluminescence, 360 °C peak was used for dating. Since the fish fossil contains relatively high concentration of Mn, the EPR Mn2+-lines cover carbonate and sulfate radicals signal (sulfur is also present in large amount), therefore 50 mW microwave power was used for EPR measurements. At this high power region Mn2+-lines become very little intense and SO2− and CO2− can be detected. Both TL and EPR dating presented an age around 8 Ma. Correction due to spontaneous decay of 360 °C peak at ambient temperature gives rise to about ∼24 Ma of age.