The late Pennsylvanian glacial rhythmites of the Mafra Formation (Itararé Group) from the Paraná Basin of Southern Brazil, have a complex rock‐magnetic signature. Rock‐magnetic tests imply that both hematite and magnetite in varying grain sizes are responsible for the magnetic remanence. Thermal and alternating field (AF) demagnetization of the natural remanence reveal different behaviors that are attributed to a mixture of remanence‐carrying magnetic minerals and grain sizes, implying a series of magnetic overprints. A great circle analysis of the distribution characteristic directions reported suggests that these rocks may not be entirely immune from magnetic overprints acquired during the Jurassic‐Cretaceous in the context of widespread remagnetizations in South America. The nature of the magnetization recorded by these rocks warrants caution in their use for the evaluation of paleosecular variation models.

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评论“从巴拉那盆地（巴西南部）获得的宾夕法尼亚州晚古地磁新结果：最近的巨型高斯过程模型是否适用于起亚超同步？” 由Brandt等人撰写。

来自巴西南部巴拉那盆地的马弗拉组（ItararéGroup）的宾夕法尼亚晚期冰川节律具有复杂的岩石磁性特征。岩石磁性测试表明，晶粒尺寸各异的赤铁矿和磁铁矿都对剩磁有影响。自然剩磁的热和交变场（AF）退磁揭示了不同的行为，这归因于剩磁的磁性矿物和晶粒尺寸的混合，这意味着一系列磁性套印。对报告的分布特征方向进行的大圆分析表明，在南美广泛磁化的背景下，这些岩石可能无法完全免受侏罗纪-白垩纪期间获得的磁性叠印的影响。