84 THE GEOLOGIST. 
are launched from time to time, and offer to tlie searcher rich re- 
wards. 
Curious too, indeed, in its geogTaphical range is this tenacious 
belt of dark blue clay. For miles and miles the narrow band ex- 
Lign. 8. — Samites rotunditd. From the Gault. 
tends along, marked to the eye in winter by its moist and spongy 
verdure, in summer by the arid browns of its scanty herbage and its 
cracked and fissured soil. All along its course grow stunted oaks ; 
