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The "Long Wall" near Ilfeld is like a window into the history of the earth: from Ilfeld porphyry (280 million years) to copper slate to Zechstein limestone (250 million years). In the mine of the same name, copper slate, among other things, has been mined since the 16th century. Here, in addition to various ores, you can also admire fish fossils, the so-called copper slate herrings. The 30 Geotope³ project aims to document the most visually appealing and scientifically significant outcrops in Germany. The focus is on digital and three-dimensional recording. The outcrops are georeferenced using cameras (including drones and 360-degree cameras), laser scanners and d-GPS. The individual locations have been presented monthly since February 2021 on the project website https://www.digitalgeology.de All data recorded as part of the project is made freely accessible. The project involves many geoscientific institutions, such as geoparks, state geological offices and universities, and is therefore cross-site. -------------------------------------------------------------------------------------------- Photo Palaeoniscum freieslebeni: H. Zell, CC BY-SA 3.0, via Wikimedia Commons Drawing: Public Domain Leaflets: www.harzregion.de/de/landmarken.html Map of the Geopark: https://geopark-hblo.de/standorte/ueb... Map of the Zechstein Sea: San Jose and Drdoht, CC BY-SA 3.0, via Wikimedia Commons