Humans have been digging in the Earth since the dawn of the Neolithic Revolution, some 12,000 years ago. While the earliest agriculturalists had to make do with shovels crudely fashioned from animal bones—shoulder blades were a popular choice—later material advances (namely stone, wood, and metal) led to the development of modern shovel designs and their specialized heads are purpose-built, like spades for digging in solid soil and shovels for moving loose material like coal or grain.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/YSF5LwqhuPM/the-8-types-of-shovels-everyone-should-know
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