THE YOUNG NATURALIST. 



THE LONDON CLAY. — This formation occupies a large spread of 

 surface, running from Leatherhead and Croydon, up to the Thames, and ex- 

 tendinging westward by Stoke, past Aldershot ; it is a stiff brownish clay, and 

 contains layers of septaria or cement stones, which are nodules of impure car- 

 bonate of lime. Its chief organic remains are : — 

 Wandsworth. 



Nautilus imperialis, Aircula media, Carduim Plums teadiense, Corbula 

 globosa, Ampullaria, Modiola elegans, Pectunculus decussatus, Cassis 

 carinata, Solarmm conoideum, Pholadomya intermedia, Rostellaria, 

 Murex trilineatus, Natica glaucinoides, Cancer Leachii. 

 Richmond. 



Ditrupa incrassata, Pholadomya margaritacea. 

 Kingston. 



Cytherea obliqua, Phorus extensus, Rostellaria ampla. 



THE BAGSHOT BEDS.— These consist of fine light coloured sands, 

 and upon them rest the Middle Bagshot or Bracklesham Beds, which are 

 clayey. The fossil remains are of rare occurrence in Surrey. 



ALLUVIAL DEPOSITS.— These are beds of gravel and brick earth, 

 which have been deposited by the rivers during flood-time or in shifting their 

 course. In the gravels along the course of the Mole, bones of the Elephant 

 and the Rhinoceros have been found. 



PRE-HISTORIC MAN. — Of the older or Paleolithic stone implements, 

 the only record is one grey flint found in gravel at Peasemarsh between Guild- 

 ford and Godalming. Of the Neolithic or Polished Stone age, specimens of 

 celts or axe heads, have been obtained from the Thames at Battersea, from 

 Coway Stakes near Egham, Kingston-on-Thames, and Titsey, one fashioned 

 out of greenstone was found deep in the clay whilst digging for the Chelsea 

 water- works at Kingston. A perforated piece of granite, intended probably 

 for use as a hammer head, was found at Titsey Bark, and one of quartzite 

 near Reigate, lied Hill ; near the latter town is a famous place for flint 

 flakes or knives ; some thousands have been collected here. Flint arrowheads 

 have been found at Lingfield, Mark Camp, and at Chart Park, Dorking, &c. 



YOUNG NATURALIST'S POSTAL EXCHANGE 



CLUB. 



I am exceedingly desirous to increase the usefulness and extend the 

 area of this club. While those who have been members of it, have been 



