146 MR. H. KYNASTON ON THE [May 1 894, 



Thus we find that the Neocomian has 1 Gosau species, the 

 Gault 5, the Upper Greensand 3, the Lower Chalk 4, the Middle 

 Chalk 2, and the Upper Chalk 8. Although there are not many 

 of these species which are confined to definite horizons or zones, 

 yet the outcome of this direct comparison tends to confirm the result 

 already arrived at. 



Of the brachiopoda found in the Gosau Beds the following occur 

 in England : — 



Rhynchonella compressa (Lam.) Range — Neocomian to Upper Chalk 



(Norwich). 



Terebratula biplicata (Sow.) „ Grault to Lower Chalk (z. of 



Holaster subglobosus). 



Terebratulina gracilis (Schl.) „ Chalk Marl to Upper Chalk. 



striata (Wahlb.) , Chalk Marl to Upper Chalk (z. 



of Belemnitella mucronata). 



Waldheimia tamarindus (Sow.) ,, Neocomian to Lower Chalk. 



Thecidium Wetherelli (Dav.) ? ., Lower Chalk to Upper Chalk. 



The range of these species is too wide for accurate correlation 

 purposes, though it will be observed that out of the 6 species we 

 have 4 in the Upper Chalk, 4 in the Middle, and all 6 in the 

 Lower Chalk. Taking the lamellibranchiata and brachiopoda 

 together as they are distributed in the Chalk, we have, in the 

 Lower Chalk 10 species, in the Middle Chalk 6, and in the 

 Upper 12. 



Thus the former conclusion, that the Gosau Beds represent on the 

 whole the Upper Chalk, is by no means weakened, and from the 

 considerations brought forward above we may conclude that they 

 represent in Britain the Chalk Bock or zone of Holaster planus, and 

 the whole of the Upper Chalk up to the zone of Belemnitella mucro- 

 nata inclusive. 



It stands to reason that all discussion of the geological horizon of 

 the Gosau Beds on palseontological grounds will not necessarily 

 apply to the Upper or unfossiliferous portion of the Gosau series, 

 namely, the sandstones, flags, and shales, with obscure plant-remains 

 and worm-tracks, and the system of grey and red sandy marls. 

 And since the fossiliferous portion of the Gosau series brings us up 

 to the zone of Belemnitella mucronata, there is no reason why the 

 upper unfossiliferous beds should not represent part of the so-called 

 Danian Beds of other districts, and be on the same horizon as the 

 chalk of Maastricht, Ciply, and Aix-la-Chapelle ; or are we to 

 include this upper portion also in the Senonian? The question, 

 however, cannot be answered positively, and must be left open for 

 the present. Hence we may conclude this section with the following 

 table of correlation between the Gosau Beds and the English Upper 

 Cretaceous zones : — 



i 



