THE YOUNG NATURALIST. 



"1.9 



THE GAULT. — This formation occurs in the neighbourhood of Bletch- 

 ingly and Shalford, and is a dark blue marl. Its chief fossils are : — 

 Bletchingly. 



Rostellaria carinata, Ampullaria caniculata, Belemnites minimus, Ammo- 

 nites splendens. 

 Shalford. 



Ventalium decussatum, Ammonites lenettice, A interruptus. 

 Richmond. 



Hamites armatus, Ancyloceras spinigerum, Ammonites splendus, A. splendens, 

 A* rostratus, A. Bouchardianus, A, interruptus, Inoceramus concentricus. 



THE UPPER GREENSAND.— This formation consists of green 

 sandy beds, and light coloured calcareous sandstones, and is about 20 ft. thick. 



THE CHALK. — Every one is familiar with the smooth rounded out- 

 lines of the Chalk downs, and with the white soft limestone which composes 

 them. The lowest Chalk beds are marly, whilst the highest contain num- 

 erous nodules and layers of flint, of which the middle portion is nearly desti- 

 tute. The total thickness of the Chalk in Surrey is about 500 feet. Its 

 chief fossils are : — 

 Purley. 



Ananchytes ovata, Holasier pillula, Micraster cor-anguinium, Cidaris scep- 

 trifera, C. clavigera, Terebratula carnea, T. semiglobosa, TerehratuCina 

 striata, Rhychonella limhata, R. plicatilis, Corania Ignabergensis, Inocer- 

 amus undulatus, I. Cuvieri, Peclen nitidus, Limia Hqperi, Spondylus spin- 

 osus, Ostrea Normaniana, Pleurotomaria perspectiva. 

 Riddlesdown. 



Ilolaster planus, Micraster cor-anguinum, Cidariss ceptrifera, Terebratula 

 carnea, T. semiglobosa, Terebratulina striata, Rynchonella limbata, R. 

 Mantelliana, Corania Ignabergensis, C. Parisiensis, Thecidum Wetherelii, 

 Inoceramus striatus, Spondylus spinosus, S. latus, Ostrea vesicularis, Oxyr- 

 liina Mantelli, 

 Kenley. 



Ananchytes ovata, Holasier planus, Micraster cor-anguinum, M. cor-bovis, 

 Terebratula carnea, T. semiglobosa, Terebratuliua striata, T. gracilis, Rhyn- 

 chonella Mantelliana, R. plicatilis, Inoceramus striatus, I. Cuvieri, Spon- 

 dylus spinosus, Pecten quinquecostata. 

 Marden Park. 



Galerites (Discorda) subriculus, G. castanea, Terebratula semiglobosa, T. 

 obesa, Terebratulina striata, T. gracilis, Rhynchonella limbata, R. Martini, 

 Inoceramus Brongniarti, i. mytiloidis, Pecten Beaveri, Lima glabosa, L* 



