MIDDLE ALBIAN STRATIGRAPHY 



IV. 



(iv) Thame to Leighton-Buzzard (Bedfordshire) 



(a) Long Crendon (Bucks) 



(b) Haddenham (Bucks) 



(c) Aylesbury (Bucks) 



(d) Aylesbury to Leighton Buzzard 



E. Borehole Evidence 

 (i) Hampshire basin 



(a) Winchester district 



(b) Relationship of Winchester to Portsdown, the Weald 



and the Isle of Wight .... 



(ii) London Basin, East Anglia, and Kent 



(a) London Basin, S. Essex, and N. Kent 



(b) The area of the Kent Coalfield 



F. Selection of sections in France 

 (i) Comparison between Wissant and Folkestone 



(ii) The outcrop from the River Ornain (Meuse) 

 To the River Armance (Yonne 



(a) Revigny-sur-Ornain (Meuse) 



(b) Pargny-sur-Saulx (Marne) 



(c) Les Cotes Noires (Haute Marne) 



(d) Courcelles pres CleYey (Aube) 



(e) La Vendue Mignot (Aube) 



(f) St. Florentin area (Yonne) 



(g) Summary . 

 (iii) Pays de Bray 



(a) Villers St. Barth61emy . 



(b) Forges-Les-Eaux, and St. Martin 

 (iv) Comparison between the Pays de Caux and the 



ISLE-OF-WlGHT . 



(a) St. Jouin 



(b) Cauville 



(c) Octeville 



(d) Cap de la Heve 



(e) Summary, and comparison with the Isle-of-Wight 

 Definition of the Middle Albian substage and its zonal 



scheme in the anglo-paris basin 



A. Historical background ..... 



B. The Zonal scheme of the Middle Albian in the Anglo 



Paris Basin ...... 



(i) Definition of the base of the Middle Albian 

 (ii) The Subzonal sequence .... 



(a) Subzone of Hoplites (Isohoplites) eodentatus 



(b) Subzone of Lyelliceras lyelli .... 



(c) Subzone of Hoplites {Hoplites) spathi 



(d) Subzone of Anahoplites intermedins 



(e) Subzone of Dimorphoplites niobe 



(f) Subzone of Mojsisovicsia subdelaruei 



(g) Subzone of Euhoplites meandrinus 

 (h) Subzone of Euhoplites nitidus 

 (i) Subzone of A nahoplites daviesi 



(iii) The position of the Subzone of Dipoloceras crislatum 

 (iv) The Zonal Grouping 



(a) The Zone of Hoplites (H.) dentatits 



(b) The Zone of Euhoplites loricatus 



64 

 64 

 64 



65 

 68 

 68 

 69 

 69 



70 

 72 

 72 



74 

 80 

 80 



85 

 86 



9i 

 93 

 94 

 97 

 99 

 99 

 100 



101 

 102 

 102 



107 

 107 

 107 



no 

 no 



118 

 118 

 119 

 119 

 119 

 121 

 122 



123 

 123 

 124 

 124 



125 

 126 

 128 

 128 

 129 



