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The Chirundu Fossil Forest National Monument site contains fossilised or petrified tree trunks of the Karoo age. It is situated in customary land of Chief Sikoongo of the Gwembe District in the Southern Province of Zambia and is 21 kilometres from the Chirundu border which forms a boundary with Zimbabwe.The site has superb fossilised tree trunks measuring up to 1.2m in diameter assigned to Dadyoxlon sp. and Rhexoxylon africanum which are difficult to distinguish with naked eyes.The main rock type here is sedimentary: red pebbly arkose (immature sandstones) formed during the Upper Karoo (Jurassic) times. These rocks show alternating coarse and fine sedimentary layers. The name Karoo is derived from the Karoo Basin of South Africa where similar rocks were surveyed.