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Many years ago, during excavation work as part of a quarry expansion, the earth pyramid-like structures were uncovered. The base is made up of the tertiary slot filling made up of sand and gravel from the Arenberg Formation and the "roof" is made up of Middle Devonian limestone. An extraordinary geotope of the highest quality - in the middle of the Westerwald-Lahn-Taunus National Geopark! ------------------------------------------------------------------------------------------------------------------------------- Earth pyramids ManfredK, CC BY-SA 4.0, via Wikimedia Commons : https://upload.wikimedia.org/wikipedi... Earth pyramids_1 Palickap, CC BY-SA 4.0, via Wikimedia Commons: https://upload.wikimedia.org/wikipedi... Karst CC BY-SA 4.0, via Wikimedia Commons: https://upload.wikimedia.org/wikipedi... Sphinx Egypt Mohammed Fayez Aldalou, CC BY-SA 4.0, via Wikimedia Commons: https://upload.wikimedia.org/wikipedi...