CHAPTER XVI. THE FIRE CLAYS AND FIRE-BRICK INDUSTRY,

Properties of fire clays,

Definition,

Chemical composition,

PAGE

.311-333

311

311

311

PART IV.-THE ECONOMIC GEOLOGY OF THE NEW JERSEY

CLAYS.

CHAPTER XVIII. ECONOMIC DESCRIPTION OF THE CLAY-BEARING FOR-

CHAPTER XIX. CLAYS AND CLAY INDUSTRIES BY COUNTIES,

PAGE

.367-508

Fig. 2.

PLATE

III. Fig. 1.

PLATE

Crusts of iron oxide in clay,
Faults in W. H. Cutter's clay bank,
Fig. 2.
White sand discolored by iron compounds,
IV. Calcareous concretions,

16

PLATE

V.

Fig. 1.

Fig. 2.

View around Carmel. Surface sandy,
View around Woodstown underlain by
Alloway clay,

PLATE

PLATE

ville,
Fig. 2. H. Maurer & Sons' pit near Woodbridge,..
IX. Fig. 1. Log washer for disintegrating clay,
Fig. 2. J. R. Such's washing plant,
X. Clay map of the State,

36

38

.in pocket

PLATE

XIIIa. Relations of air shrinkage to water absorbed in tem-
pering,

XVI. Fig. 1. Stony clay on laminated lacustrine clay,
Fig. 2. The same, showing many stones in the clay,
XVII. Fig. 1. Changes in burning a black clay to a buff-
colored brick,

Fig. 2. Irregular surface of clay under bed of
gravel. Rosenhayn,

XVIII. Fig. 1. Jointed structure of Clay Marl II, Collings

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158