Weaver's Needle, Superstition Mountains, central Arizona

Weaver's Needle, is an erosional remnant resulting from weathering and erosion of the volcanic tuff exposed in the Superstition Mountains. It stands at roughly 4,500 feet above sea level. It is a prominent landmark in Arizona's Superstition Mountains.The bulk of volcanic rocks exposed in these mountains are associated with three major ash-flow tuff eruptions at about 24.5 Ma, 18.4 Ma, and 14.9 Ma. For details on the eruptive history and tectonic features of the Superstition Mountains, we recommend, 'The Geology of the Florence Junction and Southern Portion of the Weavers Needle 7.5 ' Quadrangles, Pinal County, Arizona. 1995, by Charles Ferguson and Steven Skotnicki. http://repository.azgs.az.gov/uri_gin/azgs/dlio/245