CLAYS OF CRETACEOUS FORMATION. 159 



there are frequent exposures along roads and gullies. Farther 

 southwest its outcrop is shown on Plate X where it has been com- 

 bined with Clay Marl I. Over the greater portion of this belt, 

 however, there is a mantle of Pensauken gravel or of displaced 

 material of greater or less thickness, so that the presence of the 

 clay is not always manifest on the surface. Except, however, 

 where this mantle is of considerable thickness, the clay is com- 

 monly exposed along stream banks, gullies and road cuts. 



Clay Marl II is utilized wholly or in part for brick and drain- 

 tile at the following places : National Fireproofing Company, 

 Lorillard works, Keyport (224) ; Edward Farry, Matawan 

 (228); Dunlap & Lisk, Matawan (231) (for flower pots); 

 Jamesburg Reform School (295) ; Reed Bros,, Hightstown 

 1194); John Braslin & Sons, Crosswicks (110); James C. 

 Dobbs, Collingswood (144); Augustus Reeve, Maple Shade 

 ( 149), and Theo. Saucelein & Son, Maple Shade (150). At 

 many other localities the clay is equally as good as at these 

 points. Numerous samples have been taken both from localities 

 now worked and also from undeveloped parts of the bed. The 

 tabulated results of these tests are given in Chapter XVIII ; and 

 in Chapter XIX the various localities in each county are de- 

 scribed. 



CLAY MARL I ( MERCHANTVILLE CLAY). 



Character. — The lowest member of the Clay Marl series is 

 also a clay, but so different in its composition, in its mode of 

 weathering and its lack of numerous joints that it has been 

 found easy to differentiate it from Clay Marl II, and entirely 

 practicable to map it as a separate bed. Clay Marl I is a black, 

 glauconitic, micaceous clay, more sandy than Clay Marl II, and 

 generally less brittle and more greasy. The upper and basal por- 

 tions of this bed are commonly much more glauconitic than the 

 middle part, and have been dug for marl at a number of points, 

 but their use for this purpose has not been extensive. The lower 

 half of the bed, both the marly and nonmarly portions, are usually 

 massive and nonlaminated (PI. XVIII, Fig. 2). The upper por- 

 tion, however, particularly the nonmarly part, is more sandy and 



