1889.] THE DISPLACEMENT OF BEACH-LINES. 47 



(marine 7'). Upheaval: Calcaire lacustre de l.'Agenais 1st level (be- 

 tween 7' and 8'). This is contemporaneous with the Calcaire de 

 Beauce in the Paris Basin. In the Basin of the Gironde new 

 oscillations follow, which are Miocene, viz. Faluns de Bazas marine 

 8'. Upheaval : Calcaire lacustre de PAgenais, 2nd level (between 

 8' and 9'); faluns de Leognan et Merignac, marine (9 ); the so- 

 called Mollasse de FAnjou, which is absent in the Gironde basin 

 is, according to Tournoiwr (Ann. Sc. Geol. 1. c. p. 62) younger 

 than 9', but older than Gironde's faluns de jSalles; both are ma- 

 rine, and indicate probably two oscillations (10', 11')- After 

 that there no doubt followed another Miocene oscillation which 

 has left traces in the Basin of the Loire, in the marine faluns 

 de la Dixmerie (arc 12'). 



The Miocene epoch contained, thus, in France, 5 oscillations. 

 I have, however, not been able to obtain detailed profiles of all 

 those series of beds. 



We pass now across to England. In Mem. Geol. Surv. Gr. 

 Brit. 1856 we have accurate profiles of the Tertiary formations 

 in the Isle of Wight (by Forbes and Bristow). The series of 

 beds contains, passing from below upwards, the following oscil- 

 lations and alternations of strata: 

 Plastic Clay (brackish?) 4 alternations. 

 London Clay, marine. At least 11 alternations. 

 Lower Bagshot, (partially?) freshwater, 7 alternations. 

 Middle Bagshot (Bracklesham and Barton), the first-named fresh- 

 water, the second marine, and with 5 alternations. 

 Upper Bagshot. No alternations. 



This portion of the series of beds is, partly, older than the 

 Calcaire grossier, and there is at least one, probably two gaps 

 in it. The following series of beds is, on the contrary, con- 

 tinuous : 



Lower Headon, freshwater, and brackish, 7—8 alternations arc 



13, and the first part of 14). 

 Middle Headon, marine, 1 alternation at 14. 

 Upper Headon, freshwater, and brackish, 5 alternations between 



arcs 14 and 15. 



