The relationships between some soils and some archeological remains in west-central Florida suggest a sequence of three ages of soil development and two ages of archeological remains.

The oldest soil is represented by a weathered zone on phosphate deposits and antedates the earliest recognized human occupation. Superimposed on this weathered zone are some well-developed but much thinner soils of intermediate age, and at the base of these younger soils are distinctive nonpottery (probably pre-Pottery) archeological remains. The topsoil of these soils contains a different assemblage of stone artifacts and associated pottery. Pottery was first introduced into this region shortly before the beginning of the Christian era.

The youngest soils in the area, those developed on deposits that contain pottery, are thin, and the leached layer in them is only slightly developed.

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