This chert Rosegate arrowhead is from the Washoe Valley in western Nevada.  Washoe Valley is on the western edge of the Great Basin.  Rosegate points date to the Late Archaic period, ca. 600-1500 BP.

 

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Rose Spring points morphologically grade into Eastgate points, and they have a similar usage period, so the categories are often combined into ‘Rosegate’ points.  The appearance of Rosegate points is thought to document the appearance of bow-and-arrow technology into the Great Basin of western North America.  Rosegate points were made by pressure flaking.