AT ST. ERTH, NEAR LAIvD's EXD, COiUS'WALL. 73 



Mr. Bell had done much with the fossils, but no doubt many more 

 fossils were yet to be found, and the Foraminifera, which are nume- 

 rous, had not been determined. For his own part, he had much 

 faith in Poraminifera, when pro^Dcrly determined, as a means of 

 settling the age of such deposits. 



Prof. T. jVI'K. Hughes inquired whether the fossils had been 

 carefully collected from both the yellow and the blue clay, and 

 where exactly the change in the fauna, which had been mentioned, 

 occurred. The yellow clay, he thought, must be only the oxidized 

 condition of the blue clay. He asked further what were the rela- 

 tions of the blue clay to the underlying sand, and of the sand to the 

 beds below it. 



llr. Solly said that the section shown in the diagram was merely 

 diagrammatic ; it was not that of any one pit, but made up from 

 several pits. The junction of the sand with the blue clay is not 

 seen. He explained the relations of the different beds as seen. 



Mr. Robert Bell explained that the blue clay varied in character, 

 the lower part being unfossiliferous, while the upper part contains 

 all the fossils, He objected to the deposit being called Miocene, 

 and, from the evidence of some of the shells, regarded it as nearly 

 of Crag age. The sand shown in the diagram was said to surround 

 the clay. 



