150 
AN ANALYSIS OF MARL. 
bill is almost vertical, and swelling its throat in the 
manner of its relatives. 
I dedicate this species to my friend W. F. Tol- 
mie, Esq., of Fort Vancouver. 
An Analysis of Marl from New Jersey. 
By S. S. Haldeman. 
Read May, 1839. 
I take this opportunity to forward an analysis of 
a specimen of the peculiar concretions found in the 
New Jersey greensand. Some of these are tubular, 
having been formed, or concreted, (as I discovered,) 
around vegetable fibre , or lignite. The greensand 
itself frequently occurs in the same manner. 
Mineral Characters. — Color bluish-white on the 
surface ; light chocolate upon a fresh fracture ; soft, 
and easily broken ; generally irregularly cylindri- 
cal, sometimes tubular. The surface covered with 
grains of greensand. 
Analysis , ( a single trial.) 
Silica, 
Alumina, . 
Oxide of Iron, . 
Water, 
Volatile matter, 
82.09 
9.10 
1.31 
5.65 
1.85 
100.00 
