FLORIDA GEOLOGICAL SURVEY-THIRD ANNUAL REPORT.
has accumulated to some depth. Vegetable matter accumulates in this way only on such lands as are overflowed during a considerable part or all of the year. The largest tract of muck lands in the State is the Everglades. Many smaller tracts occur, however, throughout the State. (Pl. I3, Fig. i).
Cluny lands: The clay soils are usually of limited extent, occurrin, at places where the superficial sands have been removed by surface wash. The clay soils are lacking in organic matter and b-efore being farmed must be broken up and organic matter incorporated. The accompanying illustration (P1. 14, Fig. 3), shows clay soils formed from the decay of impure limestones. The residual material here consists of a sticky clay relatively impervious to water and lacking in organic matter.
Hammock lands: The term "hammock land" is most frequently applied to lands underlaid by marl or limestone and supporting a thick growth of vegetation, including hardwood trees and cabbage palmetto. These lands when cleared make excellent farming lands. Other hammock lands occur, however, which have no evident relation to marl deposits. These likewise support a heavy growth of hardwood trees. The soil consists of a rich humus due to the accumulation of leaves. Beneath the humus is usually found several feet of orange yellow sand. (P1. 13, Fig. 3).
Sandy hammock lands: The sandy hammock lands as developed in the sections bordering the coasts are of wind blown sands or low dunes on which vegetation has gained a foothold. Various hard wood trees grow on this type of land. It has been found in n.any instances desirable for orange culture. It is used also to some extent in vegetable growing. The open nature of the soil, however, results in a heavy loss of fertilizer from leeching.
Scrub: Scrub is a term applied to very sandy lands which support a dense growth of shrubby plants. The sandy pine lands often pass very abruptly and with no apparent reason into scrub. Few attempts have been made to utilize the scrub lands for farming purposes. (P1. 12, Fig. I).
Sand dunes: The sand dunes both of recent and of earlier formation occur frequently in Florida particularly along the coast. The sand dune soil has been found especially adapted to the growing of pineapples, the extensive pineapple farms of St. Lucie County being largely located on quiescent dunes. (P1. 14, Figs. 1-2)
River swamp: The river swamp lands support a dense growth of hard wood trees. On the smaller streams where the elevation is sufficient to permit of successful drainage these lands if cleared would furnish desirable trucking and farming land. To clear such