Bavarian Pfahl
The Pfahl is a 150-kilometre-long quartz vein (geology), vein that runs through the northeastern Bavarian Forest in Germany. From a geomorphological point of view, it represents a residual (landform), residual ridge that has been formed by weathering and erosion over millions of years. Formation The Pfahl consists of quartz that was deposited as a Hydrothermal circulation, hydrothermal vein about 275 million years ago within the existing fault (geology), fault structure. The Pfahl was probably active as a fault several times. Because the rock of the Pfahl was harder than the surrounding rock, it was left standing like a wall as softer rocks were eroded. Today the Pfahl forms a residual (geology), residual ridge 150 kilometres long and 10 to 40 metres high. The shining white quartz of the Pfahl consists of up to 98% silicic acid; any yellowish to reddish or grey coloration is caused by iron compounds and impurities (''Pfahlschiefer''). The interpretation of the actual Pfahl fau ...
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