ILLUSTRATIONS. 



PLATES. 



PAGE 



Plate I. Fig. I. Series of sedimentary clay beds, 8 



Fig. 2. Cross-stratified beds of sand. Keasbey, . . 

 Plate II. Fig. I. Raritan clay bank showing transition of 



beds, 12 



Fig. 2. Crusts of iron oxide in clay, 



Plate III. Fig. i. Faults in W. H. Cutter's clay bank, \6 



Fig. 2. White sand discolored by iron compounds, 



Plate IV. Calcareous concretions, 24 



Plate V. Fig. 1. View around Carmel. Surface sandy, .... 26 



Fig. 2. View around Woodstown underlain by 



Alloway clay, 



Plate VI. Working of .clay by a deep pit. Trenton, 34 



Plate VII. Fig. 1. Digging clay by means of open pits, 34 



Fig. 2. Working clay in a long pit, 



Plate VIII. Fig. 1. Digging clay with a steam shovel, Sayre- 



ville, 36 



Fig. 2. H. Maurer & Sons' pit near Woodbridge, . . 



Plate IX. Fig. 1. Log washer for disintegrating clay, 38 



Fig. 2. J. R. Such's washing plant, 



Plate X. Clay map of the State, in pocket 



Plate Xa. Map of clay products and clay pits, in pocket 



Plate XI. Map of the Woodbridge clay district, in pocket 



Plate XII. Map of the Cliff wood clay district, in pocket 



Plate XIII. Map of the Alloway clay, in pocket 



Plate Xllla. Relations of air shrinkage to water absorbed in tem- 

 pering, 90 



Plate XIV. Seger cones, 100 



Plate XV. Fig. 1. Clay loam near Trenton, showing its shal- 

 low character, 122 



Fig. 2. Clay loam near Mount Holly, showing its 



shallow character, 



Plate XVI. Fig. 1. Stony clay on laminated lacustrine clay, . . 128 



Fig. 2. The same, showing many stones in the clay, 

 Plate XVII. Fig. 1. Changes in burning a black clay to a buff- 

 colored brick, 140 



Fig. 2. Irregular surface of clay under bed of 



gravel. Rosenhayn, 



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



wood, 158 



Fig. 2. Clay Marl I, Camden, 



B CL G (xiii) 



