It was considered as one of the earliest anatomically modern human by scientists. This fossil was found at River Mouth cave (South Africa); associated with a Middle Stone age culture and dated to between 80-100 kya (early Late Pleistocene). It consists of a number of samples that shows a mosaic of archaic and modern features.
However, their status as an earliest anatomically modern human have been recently questioned, especially, because of the existence of gracile supraorbital region (lacks a supraorbital torus) on KRM 16425 that it was considered as a function of subadult age.
The morphological trait of KRM 16425’s browridge is similar to that of modern human as well as that of adolescent Late Neanderthal of Vindija 224 and 279. But, anyway, despite KRM 16425 is certainly not a Neanderthal, it is still unclear whether KRM 16425’s gracile anatomy reflects adolescence or modernity. Thus, claims of full anatomical modernity for the Klasies River Mouth fossils must be based on specimens that are definitely adult.
Written by: Johan Arif
50 Aherna & Smith. 2004.
http://www.mnsu.edu/emuseum/archaeology/sites/africa/klasies_river.html –> 23 August 2009