266 ■ THE FOEAMINIFERA 



replaced by silica. As a rule, however, the Upper 

 Greensand is rather poor in microzoa, and very little 

 beyond HaplojiJiragiiiiiuii and Glohigerina is found 

 in this formation. 



The so-called ' Cambridge Greensand ' is a 

 remanie bed with derived fossils, and even the 

 larger part of the ^Foraminifera, which are abundant 

 therein, may owe their origin to the waste of beds 

 equivalent to the Upper Gault. 



From the Cenomanian beds of Bohemia an in- 

 teresting and abundant foraminiferal fauna has been 

 obtained by Perner. 



The Chloritic marl of England contains a small 

 fauna, for the larger part possibly derived and 

 consisting mainly of arenaceous foraminifera. 



The Chalk Marl of England, and its equivalent, 

 the Lower Planer limestone, in Westphalia and 

 Hanover, contain a rich assemblage of species, 

 and have a large percentage of forms common to 

 the Upper Gault and Eed Chalk ; this points to 

 the long continuance of the conditions which existed 

 in earlier times. 



The Grey Chalk of the South of England is not 

 very productive in Eoraminifera, and the specimens 

 are small and apparently starved. 



In the Turonian series the ' Melbourne Eock ' is 

 largely composed of Foraminifera, which may be 

 seen in thin sections ; and its equivalent in Ger- 

 many, the Upper Planer Limestone, also yields an 

 abundant fauna. The ' chalk without flints ' of this 

 country is not so rich in Foraminifera as the sue- 



