There are also these directions from TrailPeak.com which are different and appear to point to a cliff on the topo as well. Please PM or post if you know what's correct here.
Take a right onto Chaffeeville Rd. follow for about 3 miles. You will pass Mulberry Rd. on your left, about .2 miles down the road on the right there will be a small dirt road you want to take. About 50 feet up the road go left and park next to the Nipmuck Trail (blue markers) which goes up a steep hill on your right. Follow to the top of the hill and 50 foot will be the second (non-moss-covered) cliff.
I always approached it by going down Chaffeeville Road to Bousa Road and parking at the utility line trail then following the utility line trail up the hill and approaching it from the top. There may be a better way but this approach isn't bad.
I Hiked out to check the cliff out a few days a go. I used the directions from Trailpeak.com A bit of clarification to them would consist of hiking to the top of the utility line trail which is on the left side of the dirt road. At the top of hill you will see a trail sign pointing in four different directions with descriptions of what is in each direction. While facing up the hill turn left to hike the blue blazes into the woods. This trail will fork not to far into the woods you want to go right at the fork you will pass through another trail keep going straight and this will put you right at the top of what I am assuming and by the trail map is 50 Footer. Pretty impressive little cliff. The best way to hike to the bottom is to the right not left.