Most of the fossils found at the Poricy Brook Fossil Beds are shells though shark teeth have been found. Dinosaur fossils are rare but according to their literature have also been found.
We found the shells you see above. They include choristothyris plicata, which is a small brachiopod — they're the smaller clam-like shells you see above. The shells with the holes are from boring sponges — not as in "un-interesting" but as in invertebrates that dug through the shells. The trip was a great time — the Poricy Fossil Beds are easily accessible from the road and the Conservancy rents trowels and sifters for digging in the stream bed. It's amazing to wade along the stream bed and realize that you're looking for the remains of animals that were around 72 million years ago. It's so hard to wrap your mind (at least my mind) around a century or a thousand years and the change those years can produce, that to imagine a million, never mind 72 million years ago, before the extinction of T-rex (!) is mind-boggling. As the Poricy site states, the digging at the site is made possible by the Poricy Brook's cutting action, which exposes the Navesink Formation, the layer of rock which contains the ancient remains of prehistoric clams and mussels. I highly recommend the trip — our 2 year old and 5 year old both found it fun. The former more because it was digging in (for her) shin-deep water and mud, and the latter for the same reasons and for the opportunity to dig up items that once shared the same space (so to speak) with the mighty dinos.