114 Reynés— Cretaceous Rocks. 
Triger, Semann, Renevier, Hébert, Leymerie, Mathéron, Raulin, 
D’Orbigny, Coquand, and others, all of whom have contributed to 
the elucidation of the subject, which has also received special 
attention from Dr. Reynés. His ‘ Etudes’ of 1861 is divided into 
three parts. The First comprises the history of the different horizons 
and subdivisions of the Cretaceous rocks, given by different authors; 
and a résumé of the horizons and their synonymy is offered. The 
Second Part comprises the succession of these strata in the different 
districts of France, as shown by local sections (figured also in a 
lithograph plate), and lists of fossils, for Provence and surround- 
ing Departments, the Maritime Alps, Vaucluse, Dauphiné, Drome, 
Isére, High-Alps, Savoy, the Departments of Ardéche, Gard, 
Hérault, and lastly those of Aude and the Eastern Pyrenees. 
In the last Part, the order and relationship of the beds are treated 
of, the synchronism of the separated members of the series is 
attempted with relation to faunal likeness and stratal position, and 
some general conclusions are arrived at. 
The second memoir (L’Etage, 1864) contains the ripened opinions 
of the author, modified by further researches in the Chalk of France 
and England, and also by the study of the labours of others in the 
Anglo-Parisian basin, Sarthe, Gironde, Charente, and the Medi- 
terranean countries. From these researches the author has prepared 
the following table, showing the great Cretaceous divisions :— 
1. Horizon of Belemnitella mucronata and B. quadrata, Micraster cor- 
angunum, Henupneustes radiatus, &c. ‘Chalk of Maestricht and Meudon;’ 
“Upper Chalk ;’ ‘ Dordonian ’ and ‘Campanian,’ Coquand ; ‘Senonian,’ 
D’Orbigny, in part; ‘ White Chalk’ and ‘ Marly Chalk,’ Brongniart, in 
art. 
2. Horizon of Radiolites fissicostatus, Spherulites sinuatus, Micraster brevis, 
&c.; beds with Ostrea auricularis ; beds with Hippurites Cornuvaccinum, 
Spherulites augeiodes, &e. ‘Upper Chalk;’ ‘Marly Chalk,’ Brongniart, 
in part; ‘Senonian,’ D’Orbigny, in part; ‘ Turonian,’ D’Orbigny, in part ; 
‘Santonian,’ ‘Coniacian,’ ‘ Provencian,’ Coquand; ‘ Horizon of Ostrea 
auricularis, Triger; ‘Chalk of Villedieu’ and ‘ Hippurite-limestones,’ 
Reynés. 
3. Horizon of Ammonites peramplus, Am. papalis, and Am. Deverie; beds 
with Radvolites cornupastoris. ‘Marly Chalk, Brongniart, in part; 
‘Micaceous Chalk of Touraine,’ D’Archiac ; ‘ Sands of Uchaux,’ Reynés ; 
‘Horizon of Am. peramplus, Triger; ‘Mornassian’ and ‘ Angoumian,’ 
Coquand ; ‘Turonian,’ D’Orbigny, in part; ‘ Lower Chalk.’ 
4, Horizon of Inoceramus labiatus ; Hemiaster Vernewlli, Ammonites Wiel- 
bans. ‘Marly Chalk,’ Brongniart, in part; ‘ Turonian,’ D’Orbigny, in 
os ‘Angoumian,’ Coquand, in part; ‘Zone of Rhynchonella Cunieri,’ 
Triger. 
5, Horizon of Ostrea Columba, O. biauriculata O. carinata, Caprina adversa, 
&e. ‘Beds with Ostracee, D’Archiac; ‘Lower Chalk;’ ‘Group 
with Ammonites navicularis, Triger; ‘Carentonian’ and. ‘Gardonian,’ 
Coquand ; ‘Cenomanian,’ D’Orbigny, in part. 
6. Horizon of Turrihtes costatus, T. tuberculatus, Ammonites Rothomagensis, 
Am. inflatus, &e. ‘Glauconitic Chalk,’ Brongniart, in part; ‘Chalk- 
marl’ and ‘Upper Greensand ;’ ‘Cenomanian,’ D’Orbigny, in part; 
‘Rothomagian, Coquand; ‘Chalk of Rouen,’ Reynés; ‘Group with 
Pecten asper, Triger, 
