The distribution and amount of clay rim cements are different for Permian Rotliegend and Lower Triassic Bunter sandstones in the Southern Permian and German Triassic Basins, respectively. Both are similar fluvial-aeolian deposits in hot-arid endorheic basins. In both Permian and Triassic sandstones clay grain cutans can be present, but clay rim cement is often lacking or rare in Bunter sandstones. At first sight it would appear that the presence of cutans is thus not relevant for the development of clay cementation. However, at closer inspection, it appears that authigenic clay is indeed present in both cases. In Rotliegend sandstones, the authigenic clay mainly developed as rims around the clay grain cutans, which are often thin and well microlaminated with few intra-micropores and composed of platy particles. The clay crystals in the rim decrease the pore interconnectivity and lower permeability significantly. In Bunter sandstones, most of the authigenic clay developed within the cutans. These cutans are less well microlaminated, have ample micropores, and are composed of more equant-shaped particles. The latter looser structure facilitated clay authigenesis within the cutans and their micropores. This often led to exfoliation of the cutan laminae and expansion of the entire cutan. These expanded cutans also lower pore connectivity. The presence and thickness of clay rim cement on top of cutans and grains is thus not correlated with the thickness of the cutans but with the texture of the cutans. The latter determined where authigenic clays precipitated and the thickness of cutans is partly the result of clay authigenesis within the cutans. This demonstrates that the composition and the texture of sedimentary components constrained and controlled burial diagenesis.

南二叠统和德国三叠纪盆地的二叠纪 Rotliegend 和下三叠统 Bunter 砂岩的粘土环胶结物的分布和数量不同。两者都是在炎热干旱的内陆盆地中类似的河流风成沉积物。在二叠纪和三叠纪砂岩中都可能存在粘土颗粒角质层，但在邦特砂岩中通常缺乏或很少有粘土边缘胶结物。乍一看，角质层的存在似乎与粘土胶结的发展无关。然而，仔细观察，似乎在这两种情况下确实存在自生粘土。在 Rotliegend 砂岩中，自生粘土主要发育为围绕粘土颗粒皮肤的边缘，通常很薄，微层状良好，内部微孔很少，由片状颗粒组成。边缘的粘土晶体显着降低了孔隙的连通性和渗透率。在邦特砂岩中，大部分自生粘土在角质层内发育。这些皮肤的微分层不太好，具有充足的微孔，并且由形状更均匀的颗粒组成。后者较松散的结构促进了皮肤及其微孔内的粘土自生。这通常会导致皮肤层剥落和整个皮肤的扩张。这些扩张的皮肤也降低了孔隙连通性。因此，角质层和谷物顶部粘土边缘胶结物的存在和厚度与角质层的厚度无关，而是与角质层的质地相关。后者确定了自生粘土沉淀的位置，皮肤的厚度部分是皮肤内粘土自生的结果。