The upper, larger of the two obvious formations seen on the north side of Rattlesnake Canyon from the trailhead.

From the eastbound trailhead going into Rattlesnake canyon, take the first gully you encounter going north up to the first large hill. No real trail exists to this dome, follow the path of least resistance and try to avoid the cat claw. I went uphill left of the lower formation through some steep 4th easy 5th scrambling...a better way may exist. This is a real uphill slog. Approximately 1.5 hours to reach the base.