RECENT DISCOVERIES IN THE ST. JOHN GROUP; 37 



to any known genus ; many are small, some are minute, and the larger 

 forms belong to the Obolidse and 8iphonotretidte. One of the latter 

 is remarkable as being of the inarticulate order, yet having a distinct 

 articulation at the hinge (Trematobolus). Another is notable in 

 beginning life as one genus (Schizambon) and closing it as another 

 (Siphonotreta), this being shown by the larval stages through which 

 it passed. 



A remarkable occurrence in this fauna is that of Foramenifera, of 

 which several genera are present. The most notable are Orbulina and 

 Globigerina, which at present are inhabitants of the open sea, on whose 

 bottom they have left in modern times deposits of vast extent and 

 thickness. Foramenifera abound in some of the Carboniferous deposits, 

 but they have not been reported, so far as I know, from older geologi- 

 cal systems ; they will, however, probably be found in the intermediate 

 deposits. 



From the preceding remarks it will be seen that the exploitation 

 of the Protolenus Fauna has resulted in a useful addition to the knowl- 

 edge of early Cambrian geology. 



The Geological Map of part of Kennebecasis Valley. (See next page). 

 — This map, originally prepared to show the distribution of the Cam- 

 brian rocks of Kennebecasis valley, is useful also to exhibit other 

 points in the geology of this interesting basin. The index to the 

 formations is divided and placed in the lower corners, that part to the 

 right shows the Pre-Cambrian rocks, that to the left the Cambrian 

 and later terranes. 



The foundation of the whole geological structure is the portion 

 indicated by vertical bars. These are very ancient sedimentary masses 

 classed with the Laurentian system of Canada. These old stratified 

 rocks have been broken through by igneous intrusions (quartz-diorites, 

 etc.,) of great age, which form a belt across the map, interrupted at 

 points by the waters of Kennebecasis Bay. 



Next in age come the great mass of igneous rocks of effusive or 

 volcanic origin which form the principal part of the parish of Kingston, 

 these occupy the upper side of the map. A parallel arrangement may 

 be seen to hold for these three belts ; this is due to the presence of 

 ancient and profound faults or breaks in the earth's crust of very 

 ancient date that run in an E. N. E. direction ; along these fault lines 

 the rocks have moved up and down more or less during the ages. 



Black areas are those occupied by Cambrian rocks which now form 



