As the name implies, this beach (along with many others along this coastline) often produces agates. However, that's not what this site is primarily known for -- instead, come for the fossil shells! You will find an entire bluff filled with shell fragments. Many are fragile and difficult to remove intact, but with a little time and care, you can find quite a quantity of good fossils.
Directions: From the town of Trinidad, go south on 101 for about 2 miles. Take Kay Ave (Exit 726), turn left onto 6th, and right onto Westhaven Road. Follow that until you reach Scenic Drive, and turn left. You'll then find Moonstone Beach Road on your right, which leads you to the parking area right on the beach. Go north on the beach a short ways and climb the bluff.
Difficulty: Mostly easy, but short steep climb at the end.
Equipment Needed: Rock hammer, chisel, paper for wrapping/protecting specimens. Boots with good tread are a must for the final climb.
Safety Hazards: Don't slip.
In the photo above, see the brown cliff face poking out between the trees? This is the fossil deposit. If you walk along the rocks below, you should be able to find the trail leading up (it can be difficult to spot at first glance).
You'll find a narrow, steep path that climbs beneath trees and brush. You may have to duck a bit, but the path is well-worn, so you won't be at risk of wandering off it. It's steep, but relatively short. Once you reach the top, you'll find the entire bluff of fossil shells at your fingers. Here, the difficulty is not FIND the fossils, but deciding which ones you want to dig out and take home!
These fossils are from the Pleistocene Epoch, about 700,000 years old -- quite young for fossils, geologically speaking.
Many may disintegrate at first touch -- don't be disheartened, as there are plenty of harder ones as well. They may take a little more time to find. I found numerous bivalve fossils, crab claws, sand dollars, snails, and a surprising number of what appear to be fossilized sea sponges.
Hope you enjoy the trip. Happy hunting!