"The Bow and Arrow is merely one tool in the progression of ancient hunting technology." 

The vast majority of the "points" that are collected in North America are NOT arrowheads.  They are atl-atl points or more commonly knives.  The term arrowhead is considered to be a misnomer when applied to most projectile points that are 2" or longer. 

It seems that the atl-atl arrived in North America no later than 12,000 years ago and that the bow and arrow supplanted it no earlier than approximately 2,000 years ago. 

An atl-atl dart flies at a velocity of approximately 90 mph.  A 6 ounce projectile (point + foreshaft + shaft + fletching) has enough momentum to knock a 40 lb. animal completely off it's feet.  These missiles can kill deer at 40 yds. and travel ranges greater than 100 yds.

It's still being used today, too. 

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Thank you and "Enjoy Collecting!"