MODE VII. MARLITE. 



477 



frame, so as to appear but as one piece; and the 

 drawings on the right and left bear a resem- 

 blance, which still farther helps the illusion. 

 There are some, who, to out-do nature, put 

 painted figures at the bottom of these pictures; 

 but this is an exuberance of the wonderful, 

 which finishes by spoiling all."* 



Of marlite there are two structures, the mass- 

 ive and the schistose. 



STRUCTURE I. MASSIVE. 



Aspect 1. Argillaceous marble. Green and 

 red of Campan ; but which, from their structure, 

 rather belong, at least in part, to the Anomalous 

 Rocks. 



The reddish of Ingermania, c. 



Aspect 2. Pictorial marble. This is said to 

 be massive, though it would rather appear to be 

 schistose. The marble of Cottam probably be- 

 longs to this division. 



* Brard,415. The marble of Oker in the Hartz is white, with 

 regular veins -of black clay slate; and may be classed in this divi- 

 sion. Jour, des Mines, No. 23, p. 73. 



The marlite of Shropshire, called dye-earth, more than 100 

 yards thick, contains small bivalves, and what are called the Dud- 

 ley fossils, the entomolithus paradoxus of Townson. See his Tracts, 

 p. 16$, 177- 



