Q-Z780 is defined by the presence of the Z780 Single Nucleotide Polymorphism (SNP).
Q-Z780 has descendants across much of the pre-Columbian Americas.
It is the second most common branch of Q-M242 in the Americas.
The Anzick child who lived 12,600 years ago and was found in the state of Montana, has a Y-chromosome that was initially determined to Q-L54*(xM3)[1] but is now assigned, along with modern Native American sample, to a subclade of Q-Z780, Q-FGC47532, or to Q1b-M971.
This is Thomas Krahn at the Genomic Research Center's Draft tree Proposed Tree for haplogroup Q-Z780.