petrified forest, namibia

adventure africa ancient arid blue bole bush coniferopsida damaraland desert dry dune flower forest fossil frustum gnetales hot khorixas kunene mineralized mirabilis monument namib namibia namibian national natural nature old outdoor perennial petrified plant rock sand scenic silica silicified spermatophyte spermatophytina stone tree trunk welwitschia welwitschiaceae welwitschie wood