MODE XI. CHALK. 505 



mark ; while, in other countries, it must rather 

 be regarded as a rare production. This extent 

 of chalk in a N. E. direction, and its absence in 

 the other parts of the world, is a most grand 

 and singular geological fact, which does not 

 seem to have invited deserved attention. 



Mr. Jameson's account is so concise and 

 exact, that its insertion will please the reader. 



" 1. This appears to be one of the newest of Jameson'* 



account. 



the floetz formations, and is nearly the last link 

 of the great limestone series. 



" 2. It is very simple; for it contains, besides 

 chalk, only a small portion of flint. The flint 

 occurs in tuberous shaped masses, or in the 

 form of petrifactions imbedded in the chalk ; 

 and sometimes it forms thin beds, which are 

 more or less continuous, and alternate with 

 thicker beds of chalk. It contains but few pe- 

 trifactions, and these are principally echinites, 

 ostracites, and belemnites. 



" 3. It is more or less distinctly stratified. 

 Like all new formations, it contains but few 

 metalliferous fossils. All that have been hitherto 

 found, are iron pyrites in small balls, and small 

 portions of iron ochre. 



" 4. Very few observations have been hitherto 

 made, with the view of ascertaining its relative 

 antiquity. Its occurrence on the sea-coast, and 



