First discovery of Pleistocene orangutan (Pongo sp ...
2013-12-1 · Batu Caves, Selangor. Batu Caves, base elevation 50 m a.s.l., are formed within the metamorphosed Kuala Lumpur Limestone of probable Middle to Upper Silurian age. The limestone in the hill itself is not fossiliferous, and dated by correlation with fossils found in sub-aerial outcrops in adjacent areas.