A very large roof with many long problems and some linkups, never getting higher than 7 feet until the lip of the cave.
From the parking, follow the cairn trail to the north downhill across a barbed wire fence, and then across a wash and up the hill. When the trail splits, follow the right trail down the hill and into the canyon. When you reach the streambed, follow it down canyon a a minute or two until you can see a faint trail heading up the hill to the left of a boulder in the streambed. Follow this trail through the scrub oak until you get to the cliff line and arrive at the Mega Roof. Takes about 25 minutes from the parking area.