1889.] THE DISPLACEMENT OF BEACH-LINES. 73 



cated for the last part of the stage, which may perhaps be 

 brackish. In this stage gypsum alternates with marls about 5 

 times. The main gypsiferous horizons are the beds 161, 171— 

 176, 178—188, 191 and 194. The stage corresponds to arc 4'. 



Gypse n. 1 (bed 197). A massive gypsum 8 m. thick, with 

 fresh-water fossils, representing 1 alternation. Between arcs 

 4' and 5'. 



Marne bleue (beds 198—204) and Marne blanche (beds 205— 

 209) are fresh-water marls alternating with marly limestones 

 and ferrugineous marls 4—5 times. Arc 5' and the first third 

 of arc 6'. 



Marne verte (beds 210—217) a brackish formation with 2 

 alternations of clay with marl and siliceous limestone. The top 

 of arc 6'. 



Calcaire de Brie (beds 218—220), a fresh-water limestone; 

 perhaps we have here indications of more than one climatic 

 alternation, because the limestone alternates with marl 3—4 

 times, though in rather thin bands. The place of these beds 

 is between the arcs 6' and 7'. 



Marne et mollasse marine (beds 221—231). Clay alternating 

 with marly limestone and sandstone 2—3 times. The highest 

 part of arc 7'. 



Sables de Fontenaye (bed 232) marine sand interstratified 

 with clay but, as it appears, without more remarkable alterna- 

 tions. Latter part of arc 7'. 



Calcaire de Beauce inferieur, fresh- water, between arcs 7' 

 and 8'. 



We thus get the following table showing the contempora- 

 neous beds of both basins: 



Paris: 



de Beauchamp. 

 s ^le de Mortefontaine etc. 

 Ca leaire de St. Ouen. 

 Sa Wes de Monceaux. 



Wight: 



Barton clay. 



Sands of Headon Hill. 



Wanting. 



Lower Headon. 



