Microblade technology is a period of technologicalmicrolith development marked by the creation and use of small stone blades, which are produced by chipping silica-rich stones likechert,quartz, orobsidian. Blades are a specialized type oflithic flake that are at least twice as long as they are wide.[1] An alternate method of defining blades focuses on production features, including parallel lateral edges and dorsal scars, a lack of cortex, a prepared platform with a broad angle, and a proximal bulb of percussion.[2] Microblades are generally less than 50 mm long in their finished state.[3]
The geographic origin of microblades is poorly understood, with differing theories posing origins in Southern Siberia, Northern China, or the PHSK (Paleo-Hokkaido-Sakhalin-Kurile) peninsula, with dates ranging from over 30,000 BP to as little as 18,000 BP. The microblade technology has been associated with theAncient Paleo-Siberians.[4] Because microblade technology is economical (using less raw material than other technologies), relatively easy to make, and extremely portable, it came into widespread use over vast parts of northern Asia and northeasternSiberia during and after theIce Age. Microblade technology was very efficient for hunting because it used light, barbedspears. During the Ice Age, hunter-gatherers suffered from shortage of food resources, so they had to move more frequently. Microblade is suitable for high mobility and rapid weapon production, as well as reducing failure of hunting and lost or damaged weapons.[5] In other words, in the resource-limited environment of theLast Glacial Maximum, hunter-gatherers invested more time acquiring better raw materials and developing the technique of lithic manufacture.[6] Barbed tips opened wounds and the resulting blood loss killed prey faster and with less loss of hunting equipment than traditional spears.
These changes in lithic technology appear to have been adaptations to reduced resource availability due to climate changes during the Last Glacial Maximum and Younger Dryas allowing for more efficient sustenance strategies. An important site for learning more about the diverse adaptations of the microblade is Shuidonggou Locality 12 (SDG12). It was at this site that microblades were found along with diverse artifacts: needles, awls, and a bone knife handle. This handle is a big indicator that microblades were used for multiple purposes, and no longer were exclusive to hunting.[7] In at least one site in Northern China, microblades are also found in context with heat shattered and burned stone, usually evidence for stone-boiling practices, another resource intensification strategy aimed at recovering more nutrients from food resources via cooking.[8]
The firstNative Americans brought this technology with them across theBering Land Bridge to North America. At least six independent Native American groups used microblade technology, including thePoverty Point/Jaketown,Hopewell culture,TikalMaya, andNorthwest Coast peoples. Specialized craftspeople manufactured millions of microblades in theMississippian chiefdom ofCahokia, in Illinois,[9] as didChumash (tribe) craftspeople in California's Northern Channel Islands. In both of these cases, microblades were sharpened to a point and attached to the end of sticks, creating microdrills. These microdrills were used to drill holes in marine shells to create beads. Shell beads were used as money among the Chumash, and as a result microblades were a vital part of the Chumash economy.
