IIAMPSTEAD BEDS. 493 



assertion, when it was published. This bed is of peculiar character, 

 in this respect. No other similar marl is yet known. It was every- 

 where concealed by its depth, and was found only by boring. The 

 discovery of the marl itself did not occur until long after Professor 

 Rogers had published these assertions ; and it was much later still, 

 before it was even suspected that it belonged to the miocene forma- 

 tion. Therefore, however conveniently the peculiar character of 

 this marl might have been used, if known earlier, as at least one 

 evidence for Professor Rogers' s assertions as the facts are, it affords 

 to them, as made, not the slightest support. 



THE END. 



STEREOTYPED BY E. B. MEARS, PHILADELPHIA. 



