Q-Y12449 is a branch off of Q-SK1940. According to YFull calculations, it is between 3,200 and 6,600 years old.
Q-M242 is the parent to all other Q branches. Its parent is P-M45. YFull dates show that Q-M242 is between 34,000 and 29,800 years old (95% CI). This is a much older date than in older published studies, and perhaps helps explain the great geographic spread of the branches under it.