122 FLORIDA GE~OLOGICAL SURVEY-15TH ANNUAL REPORTr

 CHAPTER V1II
 DISTRIBUTION AND DESCRIPTION OF DEPOSITS BY COUNTIES

 A description of the individual clay deposits with reference to their extent, properties and uses was not included in the foregoing account of the clay-bearing formations, inasmuch as the various deposits differ widely in their characteristics. The fuller's earth and "sedimentary kaolin" each occur in several lc'calities in the State and a more detailed account of the occurrence of the latter is given in Chapter IX.
 The various kinds of clay are not confined to any one geographical or political unit, but for convenience will he treated here by counties. The location of the active clay-working- plants (including fuller's earth) is shown on the accompanying outline map (Fig. 2).

 ALACHUA COUNTY
 Alachua County is located in the north central part of the peninsula and the Alachua, Alum Bluff and Ocala formations occupy the greater part of its area. Numerous lacustrine and sink-hole deposits of uncertain age are also present, but are limited in extent. Clays are of xvide~pread occurrence, but are usually sandy, in character.
 Coarse sandy clay suitable for sand-clay road metal is abundant in the eastern part of the county in the vicinity of Hawthorne. It ranges from five to fourteen feet or more in thickness and is overlain by a loose sand and soil overburden ranging from three inches to three feet in thickness.
 Clay suitable for drain tile, hollow block, fireproofing and a good common brick is found underlying a rather extensive area in the region about Campville. Except for the color of the burned clay, which is pink. at cone 010 and a dirty yellowish brown at cone 9, it would he desirable for face brick.
 The Campville Brick Company's plant, located at about one-half mile north of Campville, uses this clay in the manufacture of common brick. The plant is located on the Seaboard Air Line Railway (Tampa Division), which offers shipping facilities to the principal points in south Florida. F or a section of this pit see page 114.
 The Campville brick is used to some extent for fire-box and furnace linings. It has a good refractoriness and withstands sudden changes