IN THE ANGLO-PARIS BASIN 137 



occurring in the Goodland Limestone of Texas where they are associated with 

 Dipoloceras of the cristatum Subzone. It now becomes apparent that certain species 

 of the group typified by Oxytropidoceras, like other tethyan genera, may be very 

 long time-ranged. Unlike the hoplitinids which show a great deal of morphological 

 differentiation, Oxytropidoceras and its closely allied genera show comparatively 

 little such differentiation. On their own, it might prove very difficult, except in a 

 few cases, to use them for the fine subdivision of which the hoplitinids have in 

 particular proved capable. 



As yet no attempt has been made to compare the species of Oxytropidoceras (s.lat.) 

 which are known from the lyelli and spathi Subzones of the Anglo-Paris basin with 

 those occurring outside the hoplitinid province. It might well prove possible 

 eventually to correlate the spathi Subzone with the tethyan succession (including 

 Texas) on the basis of certain species of Oxytropidoceras (s.lat.). At the moment the 

 intermedins and niobe Subzones have no exact zonal links with Tethys although long 

 ranged tethyan forms are known from both time spans. Mojsisovicsia in the sub- 

 delaruei Subzone should be a renewed tethyan incursion, but none of the species from 

 this Subzone or the lautus Zone have yet been recognised elsewhere. So, at this time 

 it is not possible to correlate the Zones recognised in Texas with those of the Anglo- 

 Paris basin. It is however, apparent from Texas and Madagascar that sediments 

 characterised by the group typified by Oxytropidoceras occur between the lyelli and 

 cristatum Subzones. Although sedimentary breaks can be difficult to detect in 

 carbonate-marl sequences it seems to the writer that Young's salasi and carbonarium 

 Zones are high Middle Albian as he states. 



(viii) CANADA 



The zonal scheme of the Canadian Albian has recently been ably reviewed by 

 Jeletzky (1968), but although this represents a refinement on his earlier review of 

 1964 it is still open to criticism. In 1964 Jeletzky indicated that the Zone of 

 Arcthoplites mcconnelli contained Cleoniceras and Cymahoplites. If these ammonites 

 are correctly assigned generically then together they indicate a Lower Albian, mam- 

 millatum Zone age in the sense of Casey (1961a ; Table 1) and herein. Cymahoplites 

 occurs in the mammillatum Zone of Europe (Casey 1961c ; 165-169, PL XXIX, figs, 

 ia-d), and although Cleoniceras (C.) ranges from the tardefurcata Zone (regularis 

 Subzone) to the basal Middle Albian eodentatus Subzone, the weight of evidence, from 

 the associated ammonites indicates a mammillatum Zone age. There is no evidence 

 at this time to indicate that the Subzones of Lemur ocer as irenense and L. mcconnelli 

 are the correlatives of the European Subzone of Douvilleiceras inaequinodum (Jeletzky 

 1968 ; Fig. 1) now the basal Middle Albian Subzone oiHoplites (Isohoplites) eodentatus. 



The Gastroplites Zone has been equated by Jeletzky (1968 ; Fig. 1) with both the 

 daviesi Subzone (Middle Albian) and the cristatum Subzone (Upper Albian). How- 

 ever, G. cantianus Spath which occurs in the Gastroplites Zone in Canada occurs also 

 in Bed VIII at Folkestone its type locality. It is undoubtedly of cristatum Subzone 

 age, and there is no evidence for correlating the daviesi Subzone with any part of the 

 Gastroplites Zone at this time. 



