186 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [DeC. 13, 



Annecy le Vieux, an ascending succession from neocomian to over- 

 lying nummulitic rocks with Pectens ; but the broken nature of the 

 banks at this locality, and the little time at my disposal, prevented 

 the tracing of the intermediate strata. On approaching the village 

 of Thones, it was however seen, that after several flexures the upper 

 strata of neocomian limestone with Caprotina ammonia, forming a 

 striking ridge on the north side of the valley, and having here a north 

 and south strike, plunged south-east at an angle of 55° to 60°, throw- 

 ing off on its surface the other strata exhibited in this diagram. 



Fig. 6. 



c d e f f g g 



f, f. Numraulite limestone, g. Flysch . 

 e. Transition bed. 



d. Inoceramus white limestone or chalk. 

 c. Gault and greensand. 

 a Sib, Neocomian limestones. 



On ascending to the little depression above the surface of the upper 

 neocomian (6), it was evident that the excavation was due to the beds 

 being less coherent than the hard limestone (b & d) above and below 

 them. M. Pillet and myself then detected greensand terebratulse, 

 which, when combined with the position and character of the strata, 

 led me to believe that this band of dark shale, impure limestone, and 

 sandy green marlstone (c) was the representative of the gault and 

 upper greensand usually exhibited in these Alps. These beds gra- 

 duate upwards into yellowish limestone, which is surmounted by a 

 cream-coloured compact limestone vrith flints weathering white (d), 

 in which we found several specimens of Inocerami, the best-preserved 

 of which was the I. Cuvieri. 



Here then we had under our feet a band (d) which by position and 

 fossils must fairly stand for the chalk. In proceeding upon the dip 

 this limestone is seen gradually to change its colour from white to 

 brown (e), and in a short space, without the slightest break or un- 

 conformity of the strata, the overlying mass is charged with num- 

 mulites. The nummulitic strata (/") becoming sandier upwards, 

 contain also certain Pectens, and these shelly beds are overlaid by a 

 zone of coralline concretionary sandy limestone, and the latter by a 

 strong-bedded, dark grey, white-veined limestone. This nummulitic 

 group, so intimately linked on to the Inoceramus limestone (or chalk) 

 in its lower beds, is quite as intimately connected with the strata by 

 which it is overlaid, i. e. with micaceous sandstones, marls, impure 

 limestones and conglomerates, which represent a portion of the 

 "flysch of the Alps (^)." These flysch beds contain certain scales 

 of fishes enumerated by Agassiz, and some casts of shells. They are, 

 in short, identical with the strata which at the desert near Chambery 

 had been pointed out to me as the recognized lower beds of the 

 ** flysch" of Savoy, where they equally overlie and are equally con- 

 nected with bands of nummulite limestone. 



In ascending the lateral longitudinal valley of the Borne, which 



