Stratignxphical Geology. 85 



The correlation of these beds with those in England and 

 the Continent is shown in the annexed table : 



CONTINKNT. EncLANO. IRELAND. 



Uanian Absent Absent 



Senonian Upper white chalk, White chalk (5) 



with flints (llauconitic chalk (4) 



Turonian Chalk, without flints Absent 



Cenomanian Lower grey chalk Glauconitic sands (3) 



Chalk mail 



Cambridge green-sand Glauconitic sands ( i ) 



Albian Gault Absent 



The Glauconitic Sands consist of a blue-green rock, 

 rich in glauconite, showing evidence of having been formed 

 in the interior of foraminiferal shells. In the Squire's Hill 

 sections they preserve a uniform thickness of about five 

 feet. The sands are characterized by Exoayra conica; other 

 fossils found are Lamna appe/idicu/ata, Belemnites ultimiis, 

 Exoi^^yra kcvigata, Pecten orbicularis, P. (juadricostatus, and 

 Ditricpa deformis. 



The Yellow Sands consist of buff-coloured calcareous 

 sandstones, with chert masses and layers of soft brown 

 sandstone, becoming at the base black and shaly. Fossils 

 are fairly plentiful and in good preservation — Osirea cari?iatijy 

 Exogyra hevigata var. plicaia, Pecten fiilidiis, Rhyiichonella 

 latissima, Cardiasler nna/ichytes. 



Glauconitic (so-called Chloritic) Sands and Sand- 

 stones. Dark green sands, almost made up of grains of 

 glauconite; at the base of the section almost black; fossils 

 are found, such as teeth and vertebrre of fish — Exogyra 

 coluinba, Osirea semiplajia, O. carinaia. 



Glauconitic (so-called Chloritic) Chalk, the Basement 

 Bed of the White Chalk, presents an interesting deposit 

 of hard green chalk, with pebbles of quartz and large 

 grains of glauconite scattered throughout the bed. Its fossil 

 contents are chiefly sponges, with bands of Ananchytes ovatiis. 

 This interesting bed is evidently derived from the waste of 

 an older bed containing large pebbles of rounded quartz, and 

 characterized by an abundant fauna, chiefly fragments of 



