![]() ![]() Weltje - which reflect relative abundances of the three main framework components (provided they exceed 10%QFL). The classic QFL plot is subdivided into 15 fields - labelled by adjectives introduced long ago by K.A.W. The descriptive petrographic classification of sand and sandstone proposed in this paper is based on the quasi-universally used Gazzi-Dickinson point-counting method, and simply translates into words ternary compositions of quartz, feldspar, and lithic fragments without introducing any new names. ![]() A renovation that treasures the legacy of the pioneers is required. As a consequence, too many scientific articles and technical reports are still encumbered with obsolete concepts, graphical tools, and ambiguous terminology that make sediment descriptions awkward and misleading. Petrographic classifications of sand and sandstone proposed more than half a century ago are still in use, although they were formulated at a time when depositional and post-depositional sedimentary processes were poorly understood, and before the relationships between tectonics and sedimentation could be interpreted in modern plate-tectonic terms. ![]()
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