IN THE ANGLO-PARIS BASIN 133 



sequences south of it. The alleged occurrence of Hoplites (H.) in Mexico has not yet 

 been substantiated by illustrations. 



B. Links with the sequences of other countries 



There are two rather fortuitous major links between the hoplitinid faunal province 

 and other faunal provinces. The first of these comes in the lyelli Subzone near the 

 base of the Middle Albian, the other in the cristatum Subzone at the base of the Upper 

 Albian. Between the two there are very few links known. 



(i) WEST PAKISTAN 



Spath (1930b) described an Albian fauna from the area of Hazara, now Abbotabad, 

 in W. Pakistan. The ammonites come from a condensed deposit which yielded 

 possibly mammillatum Zone, and definitely lyelli Subzone fossils. The lyelli Subzone 

 is indicated by the occurrence of Lyelliceras lyelli, L. cotteri, species of Oxytropidoceras 

 (sensu lato) and Brancoceras. However, no species of Hoplites (H.) have been re- 

 corded. No direct comparison can yet be made with the sequence in the U.S.S.R. 

 where this Subzone has not yet been detected, and in fact in the hoplitinid province 

 the Subzone is not represented E. of the western area of Switzerland. No other 

 Middle Albian links are known from Pakistan, although the cristatum Subzone is 

 definitely represented. The two specimens of Oxytropidoceras figured by Spath 

 (1934b ; 18-21, 30, pi. vi, figs. 1, 2) from the Attock district are of Middle Albian age, 

 but cannot be assigned to a subzone at this time. 



(ii) TETHYAN BELT 



As yet very little knowledge exists on the degree of Zonal and Subzonal repre- 

 sentation in the Middle Albian sediments of the part of the tethyan belt stretching 

 westwards from W. Pakistan through Iran and Asia Minor, the Mediterranean 

 countries to reach the proto-Atlantic on the W. coast of Spain. It is clear that the 

 phylloceratids, some lytoceratids, and desmoceratids, where they occur, are too long 

 time-ranging to be of even zonal value. Desmoceras latidorsatum, for example, occurs 

 in the mammillatum Zone, as well as in the lyelli and intermedius Subzones in the 

 Middle Albian hoplitinid province. From the discussion of the American sequences 

 it seems that Oxytropidoceras sensu lato may also include long time-ranging species. 

 However, the mojsisovicsiinids, and in particular the engonoceratids may eventually 

 aid correlation with the provinces to the north and south of Tethys. In this respect 

 the distribution of Platiknemiceras is of significance (Casey 1961b). The strati- 

 graphic range of this genus as indicated by Casey can in two instances be narrowed. 

 It is associated with an example of Lyelliceras gevreyi at Hamiran, Iran (BMNH., 

 C 68410) cited by Spath (1931 ; 315) and recorded as Prolyelliceras by Casey (1961b ; 

 354). This specimen shows the extra-intercalated siphonal crenules and tendency to 

 en-echelon ventro-lateral crenules characteristic of forms which occur at the base of 

 the lyelli Subzone. L. flandrini crenulata discussed below is of the same age and is 

 also associated with Platyknemiceras. 



