Vol. 57,] TTPPER GEEENSAND AND CHLORITIC MARL OF WILTSHIRE. 101 



jdeld fossils ; but the greater number have come from a bed which 

 lies at the junction of the two formations, and which on a first 

 inspection it would be difficult to assign definitely to either. 



It is only by a close observation of the section, and by careful 

 collecting from each of the successive beds, that good reasons can be 

 adduced for drawing the line of separation at one horizon rather 

 than at another. We may admit that our first impressions were 

 modified by later discoveries. 



The section in this quarry is illustrated in fig. 1, below : — 



Fig. 1. — Seefion in Maiden Bradley Quarry. 



Surface-soil 



Feet. Inches, 

 about I 6 



Chlorifcic Marl with scattered phos- 

 phates and. phosphatized fossils, marly 

 above, sandy below 2 



Brownish glauconitic sand with a layer 

 of phosphatie concretions and fossils 

 at the base 



Cornstones, or calcareous concretions 

 with a brown phosphatie crust I 



'^ Fine greyish-white siliceous earth, with 

 nodules of grey chert 3 



I Fine grey glauconitic sand, with large 

 Y eehinodtrms and broken specimens 



oiNeithea 2 



Large blocks of chert, nearly continuous 2 



Fine grey glauconitic sand ^ 



Hard, granular, spieuliferous sandstone 1 



Granular sandstone and sand ^ 



[Vertical scale : 4 feet = 1 inch.] 



V Glauconitic sand with some scattered 



I calcareous concretions 2 9 



