Vol. 50.J GOSATT BEDS OF THE GOSAU DISTRICT. 143 



the second, which he places towards the top of the Senonian, we 

 find Hipp, organisans, Hipp, cornu-vaccinum, Sphcerulites angeiodes, 

 and Plagioptychus Agidlloni (op. cit. p. 202). 



Toucas seems to have lumped together all the species of Rudistce 

 found in the Gosau Beds, and to have referred them to his 2nd zone 

 of Hippurites. But surely it would he more natural to keep the 

 two Gosau zones separate, since stratigraphical evidence is so 

 strongly in favour of their heing distinct, and to correlate them 

 with the 1st and 2nd zones of Hippurites respectively of the South 

 of France. Thus we should have the zone of Hipp, cornu-vaccinum, 

 remaining intact near the base of the Gosau series, and heing the 

 equivalent of the uppermost portion of the Turonian system of 

 Toucas. We should hardly expect to find at Gosau such ammonites 

 as A. Requieni, A. peramplus, A. papalis, A. Deveri, A. nodosoides, 

 since the majority of these occur in the South of France below the 

 first zone of Hippurites, or the zone of Hipp, cornu-vaccinum, which 

 zone is the first stratum of the Gosau Beds wherein any fossils 

 occur. 



Dr. Emmanuel Kayser alludes briefly to the Gosau Beds in his 

 ' Lehrbuch der geologischen Formationskunde ' (Stuttgart, 1891), 

 and remarks (p. 280) that the lower beds belong to the Turonian, 

 and the higher to the Senonian. Toucas's objection to any part of 

 the Gosau series being considered as of Turonian age is that, when 

 one does find Turonian species in them, such as those of Uchaux in 

 the South of France, they are only those which pass up into higher 

 beds. But when we consider how strong the evidence is in favour 

 of the occurrence of the true zone of Hipp, cornu-vaccinum at Gosau 

 and other places in the Eastern Alps, and bearing in mind the con- 

 siderations brought forward above with regard to the two zones of 

 Hippurites, we cannot but conclude that the basal portion of the 

 Gosau Beds should be correlated with the zone of Hipp, cornu- 

 vaccinum, included in the first zone of Hippurites at the top of the 

 Turonian system. 



Passing from the zone of Hipp, cornu-vaccinum to the Senonian 

 zones of Provence and Corbieres, we find (Toucas, op. cit. pp. 210- 

 217) that the larger proportion of the fossils from the Gosau Beds 

 occur also in the zone of Belemnitella and the 2nd zone of Hip- 

 purites in the upper part of the Senonian. Hence we shall not be 

 far from the mark in concluding that the Gosau Beds represent the 

 uppermost Turonian, and the whole of the Senonian of the South of 

 France — that is to say, from the zone of Hippurites cornu-vaccinum 

 to the zone of Belemnitella inclusive. In Touraine and in the Paris 

 Basin the same horizon is defined from the zone of Amm. Requieni 

 in Touraine [ = zone of Holaster planus and Am. peramplus in 

 the Paris Basin] to the zone of Belemnitella mucronata, and hence 

 in the English Upper Cretaceous rocks we shall find the repre- 

 sentatives of the Gosau Beds in the zones of Holaster planus, 

 Mic raster, Marsupites, and Belemnitella mucronata — that is to say, 

 from the horizon of the Chalk Bock to the top of the Chalk-with- 

 flints inclusive. 



