In Monmouth County, NJ the fossilized remains of the marine reptiles make up the majority of this group. Dinosaur finds in New Jersey are rare, with the duckbilled dinosaur being the exception.
Common stream finds tend to be scrappy, usually limited to isolated teeth, some vertebrae and an assortment of bone fragments. The remains of the marine turtles and mosasaur teeth are the most common finds.  
 

Plesiosaur Cimoliasaurus magnus	Mosasaur	Hadrosaurus
Scarce	Uncommon	Scarce
Turtles	Crocodilian
Common	Very uncommon