of the curve. The „systeme Ypresien", in Belgium, is divided into 

 two sub-stages; the oldest, clay containing foraminifera; the 

 youngest, sandy, containing numerous fossils, and therefore, 

 doubtless, indicating a shallower sea. A new deluge formed, in 

 Belgium, the marine „systeme Paniselien" (sand), and, in the 

 Paris basin, the marine sand of Cuise. With this the lower Eocene 

 epoch is closed. It has, thus, in all probability, 6 oscillations. 



The middle Eocene -is represented in France, principally, by 

 coarse lime-stone (Calcaire grossier). In that „ stage" there are 

 5—6 „sub"-stages, and in several places breaks in the series of 

 beds. The middle Eocene is, upon the whole, marine, but with 

 intercalated fresh- waters layers; and it also probably represents 

 6 oscillations. In Siebenburg it begins (cfr. Koch in Foldtani 

 Kozlony 1883, p. 1.18 ff.) with alternations of clay and marl, 

 superimposed on which are alternations of gypsum and marl 

 (lower gypsum horizon, 1st oscillation). Above that, marine 

 layers: The perforata beds, from below and upwards 'a) an oyster 

 bed, (5 argillaceous marl, y) calcareous marl (lower striata-horizonj; 

 5) a shell bed (lower perforata horizon), s) Clay (upper striata 

 horizon, the second oscillation'?), £) Clay with a few hard marl 

 beds, and containing the same kind of fossils as ,3, ij) another 

 oyster-bed, ft) Clay with oysters, i) calcareous marl, upper 

 perforata horizon (the third oscillation?). Above that the 

 Ostrea clay, a thick clay with oysters and marl beds, and a 

 sandy calcareous bed in the middle (fourth oscillation). Above 

 that the lower coarse lime-stone, usually in two thick beds (fifth 

 oscillation), covered by a thick bed of clay containing inter- 

 calated layers of sand, and probably a fresh-water formation, 

 and at the top, covered by fresh-water lime-stone Finally, the 

 last (6th) oscillation: the upper gypsum horizon; gypsum al- 

 ternating with clay, and above that coarse lime-stone alternat- 

 ing with gypsum; in other places foraminiferous clay, marine, 

 the upper coarse lime-stone. I have stated all those details 

 in order to show that those layers, all of which are contem- 

 poraneous with the Calcaire Grossier of the Paris basin, appear 

 to indicate 6 oscillations. 



