I 
TABLE OF CONTENTS. xi 
PAGE 
CHAPTER XL. 
The Middle Chalk in Lincolnshire. 
Genera] Description - - - - - 478 
Stratigraphical Details - - - - - 479 
Zone of Rhynchondla Guvieri - - - - - 479 
Terebratulina Zone ------ 481 
List of Fossils ------- 484 
CHAPTER XLI. 
The Middle Chalk in Yorkshire. 
General Description - - 485 
Stratigraphical Details - - - - - 486 
List of Fossils ------- 490 
CHAPTER XLII. 
The Equivalents of the Middle Chalk in the North of 
France. 
The Turonien of d’Orbigny, and its extension by later authors 491 
1 . Sections in the North-east of France, with list of Fossils 
from the Dieves of Ardennes - - - - 492 
2 . Sections in the North-west of France - - - 495 
CHAPTER XLIII. 
The Microscopic Structure of the Middle Chalk (by Mr. 
W. Hill). 
(a) Structure of the Melbourn Rock and Basement Beds ; 
Macroscopic Aspect; Microscopic Aspect; Examination 
of Residues ; Tabulation of Results - - - 499 
(b) Structure of the Chalk above the Melbourn Rock ; Micro¬ 
scopic Aspect; Results of Washings ; Examination of 
Residues ; Tabulation of Results - - - 505 
(c) Structure of the Terebratulina Zone ; Microscopic Aspect; 
Examination of Washings; Examination of Residues ; 
Composition of the Fine Residue - - - - 514 
(< d ) General Summary. List of Foraminifera - - - 525 
CHAPTER XLIY. 
The Chemical Composition of the Middle Chalk. 
Analyses of Melbourn Rock and the Chalk of the Rh, Guvieri 
Zone. ------- 526 
Analyses of Chalk from the Terebratulina Zone - - 529 
CHAPTER XLY. 
White Chalk as compared with ,recent Calcareous Oozes. 
1 . Points of Resemblance and Difference - - - 531 
2 . Is white chalk a Foraminiferal Deposit 1 - - 536 
CHAPTER XL VI. 
The Physical and Geographical Conditions of the Middle 
Chalk Period 
Geographical Conditions - - - - - - 541 
Evidence of Current Action - 546 
Bathymetrical Conditions - 548 
Index 
560 
