Gray Tree Frog and Purple Cliff Brake Found in Mount Holly. Rancocas Pathways 4 years ago Gray Tree Frog and Purple Cliff Brake Found in Mount Holly, 1 minute video on Mount Holly relationship to the North Branch. Mount Holly Early December Wind 20-30 mph, air temps w/o wind chill 38 degree’s. Paddle Safe, Paddle Down, Support Local Commerce Supports Public Access Share this: