Although ostracods are not abundant in the Cretaceous-Tertiary rocks of New Jersey, they are so distinctive that when they are present, they can be used to tell Tertiary rocks from Cretaceous rocks. Two previously undescribed ostracod faunas, one from the Red Bank sand (Monmouth group-Cretaceous) of 26 species and one from the early Tertiary Vincentown sand (Rancocas group early Tertiary) of 25 sp., are identified.