426 ■ Br. G. T. Trechmann — 



deposited. They include several forms of Gerithium and Natica, 

 among others, whose paleeontological horizon I hope to fix in due 

 time. There appeared absolutely no evidence th.a.t Rudistce had 

 lived during the deposition of the Richmond beds, and all of them 

 were in the form of rolled and fossilized limestone pebbles. 



Turning now to Hill's Cambridge and Catadupa formations, the 

 critical section is that exposed along the railway cutting of the 

 Kingston to Montego Bay railroad between Cambridge and Catadupa 

 stations. Other Cretaceous sections in Jamaica, such as, for instance, 

 that at Jerusalem Mountain, in the extreme west, Logic Green 

 and the Rio Minho, in the centre of the island, or Mooretown and 

 ■ Plantain Garden River, in the extreme east, do not suffer the 

 interesting imputation of harbouring a Cretaceo-Bocene fauna. 



Hill publishes ^ illustrations of drawings of a discontinuous series 

 of sections exposed in the railway cutting to the north and south 

 of Catadupa station under the heading of " Exposure of Cambridge 

 formation near Catadupa and Cambridge ". The drawings apparently 

 represent only those sections that are actually cut through by the 

 railway line, and seem, to ignore the beds which are exposed in 

 numerous stream and road cuttings, both above and below the rail- 

 way line. Hill indicates no faults in his section, which extends over 

 more than two miles, and I find the sequence of beds difficult to 

 make out in his sketches, except that the Cockpit or White Lime- 

 stone overlie? the " Cambridge " beds at one place unconformably. 

 Hill's section stops about 4 miles south of Cambridge, but another 

 section, labelled " Cambridge Station ", shows two very regular 

 anticlines and an mtervening syncline. 



I made several traverses, on some days in company of Dr. C. A. 

 Matley, of the line between Catadupa and Cambridge, and also for 

 some 3 or 4 miles south of Catadupa and north of Cambridge, 

 both on foot and by 'means of a trolley which was kindly provided 

 by the Director of the Jamaica railways. Several of the numerous 

 stream and road sections below and around Catadupa were also 

 investigated. Evidence of faulting and other dislocations is very 

 strong in this district, especially in the neighbourhood of Catadupa. 

 Faults in more than one instance bring the Yellow Limestone with 

 its characteristic Eocene fauna mto almost immediate contact 

 with the Rudist Limestone (Fig. 2), and also in at least one case they 

 bring red shales apparently of Eocene age underlying the Yellow 

 Limestone into contact with Cretaceous shales of a similar colour 

 and appearance which occur below the Rudist Limestones. 



The fossils, unless collected with considerable care along this 

 stretch of line, would tend to become mixed together, especially 

 as in this district the Rudist Limestone often assumes a yellow colour, 

 very like that of the true Yellow Limestone. This seems to me to be 

 what has happened with the collections that Hill made. He says 



^ Log. cit., p. 59. 



