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Originally Posted by baganing_balyan
the development of tools is from simple to complex. The more intricate it looks, the more recent it is.
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I beg to differ - although this is true to a certain degree within the life of a people or civilization, even over the life span of a human population there can be changes in complexity from one time period to the next.
Example: look at the Indus Valley civilization - very complex with complex artifacts in the 2nd millenium BC, but compare this to the 1st millenuim it looks like the appex of civilization. The same can also be said of the region of the Middle East around what is now Palestine over several periods where different peoples changed the level of complexity of artifacts (ie. after the arrival of the "Sea Peoples" or the arrival of Amorite tribes into the region).
Thus a period of complexity in design or artifacts can be followed by a period of lower complexity (ie. the European "Dark Ages" after the fall of the Western Roman Empire). These kris may be older than you think and the use of ivory goes back millenia.