Abstract
The occurrence of (1) calcite aureoled quartz, and (2) vertical cylindrical features (“rhizocretions” in literature), and subspherical or unevenly shaped nodules resulting from the coalescence of smaller elements (“nodular calcrete”) is reported in various Permian continental series from Western Europe (Sierra Morena, Spain) and North Africa (Central Meseta of Morocco). These features are developed in flood plain pelites (mudstones) interbedded with gravelly channel material and debris flow deposits. These nodules are interpreted as pedological concretions formed in hydromorphic soils under tropical climatic conditions with contrasting seasons and not under desertic environments.
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