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Geomorphological mapping of parts of the Mekele outlier reveals the presence of numerous river tufa dams, spring tufas and old landslides, indicating high groundwater levels and karstic activity in the area during former times. U/Th dating of river tufa dams indicates that wet conditions prevailed in the highlands as early as 15,000 BP. This is 4 to 5000 years before the first signs of post-last glacial...
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