LIST OF ILLUSTRATIONS IN THE TEXT. 



Sketch-map showing positions of sections of strata near Leighton Buzzard 

 Diagram showing part of beds in the working face of Harris's Pit 

 Diagram of section of Asteroceras obtusum .... 

 Diagram showing discontinuous siphuncular tube in a Hildoceratid 



Ammonite ........ 



Diagram of section in western face of a sand-pit north side of Mile Tree 



Farm ......... 



Transverse section of Branksome Chine .... 



Longitudinal section of Branksome Chine .... 



Longitudinal section of Alum Chine ..... 



Longitudinal section showing relation of the old and new vallej?s to the 



changing shore-line ....... 



Diagrammatic section showing quartzose conglomerate at Caldon Low 

 Synoptic view of the two interpretations of the section in Harris's Pit 

 Posidonomya Becheri Bronn, var. nov siawensis 

 Fruit of fossil Charophyte from Locle, Switzerland 

 Sketch-map of North Arran, showing faults and the granite . 

 Section from Catacol Bay, through Meall nan Damh, etc. ; section 



Glen Rosa ........ 



Sections across the valley of the Garbh Allt, west of Glen Rosa 

 Sections across the valley of the Gleann Easbuig . 

 Sketch-map of the Snowdon district ..... 



Section from Snowdon to Mynydd Mawr .... 



Hypothetical sketch of Snowdon at end of pre-Glacial times . 

 Arvicola mditznsis sp. nov. Crown view of first and second right 



molars ......... 



Homalonotus bifurcatws sp. nov. ..... 



Sketch-map of Castle-an-Dinas ...... 



Section of workings, Castle-an-Dinas Mine .... 



Elutriation curves of sediments to show meaning of " Equivalent 



Grade " ........ 



Types of elutriation curves of arenaceous sediments 

 Diagram showing thickness of Thanet Beds .... 



Provisional classification of the finer arenaceous sediments . 

 Elutriation curves of Thanet Beds ..... 



Graph showing relation between equivalent grades of Thanet Bed 

 Section along shore at Sleaford Bay ..... 



Dia.grammatic sketch of flat surface of dolomite . 

 Logarithms in miles from Charlton ..... 



lower 



10 



27 



.57 

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74 

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 149 



153 

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210 

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348 

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366 

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 451 

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 467 



