The defining factor in St. Johns series is the temper. The temper in this type is diatomaceous earth that occurs along the St. Johns River and in the clay naturally.
Plain diatomaceous earth-tempered pottery. Sponge spicules are also sometimes used to temper this type. Sand tempering is sometimes used in this type in the late St. Johns II period. The most common vessel forms are large bowls, small unusual shaped vessels also occur. Small necked pear-shaped jars occur in the St Johns I period. While jars with constricted necks and flaring orifices occur later in St. Johns II.
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