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At the height of the last ice age (the Wisconsin glaciation), the sea level was up to 100 meters lower than at present.
Much more land was above the water along the coast, which was extended much farther to the west.
The Page-Ladson prehistory site (8JE591) is a deep sinkhole in the bed of the karstic Aucilla River (between Jefferson and Taylor counties in the Big Bend region of Florida) that has stratified deposits of late Pleistocene and early Holocene animal bones and human artifacts.
A group of eleven artifacts found there have an average age of 15,405 to 14,146 calendar years Before Present (12,425 ± 32 Its significance is that the dating of the artifacts places humans at the location more than 1,500 years prior to earlier evidence and challenges theories that humans quickly decimated large game populations in the area once they arrived.
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As limestone is porous, salt water penetrates the lower part of the Florida platform, and fresh water floats on top of the salt water.
This article focuses on samples from the stratified shell midden, from which it was hoped to construct a local correction for marine shell that could be used to date other contexts.
The soil-charcoal and bone collagen from these samples have very similar ages (bone samples ranging from about 100 cal BC to cal AD 530 and soil-charcoal from cal AD 345 to 560); however, the shell samples collected from the same stratigraphic units are significantly older than the terrestrial dates (ranging from 1300 to 390 cal BC).
New results are presented comparing shell, bone, and soil-charcoal age determinations from the Crystal River site, located along the west-central Gulf Coast of Florida.
Crystal River is a large multimound site whose occupants engaged in long-distance exchange throughout eastern North America during the Woodland period (∼1000 BC to AD 1050).
Archaeologists interested in radiocarbon dating shell midden sites express concern regarding the accuracy of shell dates and how such determinations should be interpreted.