Studies on the Earth's Magnetic Field in the Holocene have a poor geographic distribution, with only 7% of the data coming from Africa and South America, an area that comprises the South Atlantic Magnetic Anomaly (SAMA). In the present study, good quality magnetic data with secular resolution is introduced, covering most of the Holocene (~2500 to ~10500 years BP). Problems with high error U-Th ages were circumvented using correlation of isotopic series of 𝛿 𝑂 e 𝛿 𝐶 with a well dated speleothem.The main magnetic carrier is a low coercivity mineral (attributed to magnetite/maghemite of pedogenic origin). Directional data point to inclination (-40.0°) and declination (-4.1°) values compatible with current values to the location and existing geomagnetic models. The relative paleointensity estimates, obtained by the pseudo-Thellier method, show three major periods of fast paleointensity variation of the geomagnetic field in relative agreement with geomagnetic models dominated by data from lake sediments. Between 3000 and 5000 years BP values up to 50% higher than the average are estimated; between 5300 and 6200 years BP paleointensity reaches relative values of approximately half the average and between 8200 and 9000 years BP it reaches relative values that double the average. This new data can improve these models and help to understand the South Atlantic Magnetic Anomaly, as well as the behavior of the Earth's Magnetic Field throughout the Holocene.