Welded tuff of the Turkey Creek Caldera (~ 27 Ma) ignimbrite weathered into a swarm of pinnacles in Chiricahua National Monument in southeastern-most Arizona. The Chiricahua Mountains are a favorite hiking and camping spot. For more on the geology download free John Bezy's 'Rocks in the Chiricahua National Monument' booklet. https://library.azgs.arizona.edu/item/DTES-1552428755771-84
OR Pallister and others, 'Guide to the volcanic geology of Chiricahua national Monument ...' https://pubs.usgs.gov/imap/2541/report.pdf
Photographer: Unknown
Photo Date: October 2007