Granite at Mounts Adam and Eve. 649 



with bibliography of the geological relations has been prepared by 

 F. I). Adams and A. C. Lawsou/ which, being in English, and 

 generally accessible, need not be repeated here. A gabbro in these 

 Scandinavian localities is a quite regular associate of the deposits 

 of apatite, and towards its contact with the latter it becomes a mix- 

 ture of scapolite and hornblende, and is called "geflecter Gabbro." 

 It is regarded as a contact facies of the gabbro, and as a favorable 

 indication of apatite. While not finding it in the same relations in 

 Canada, Adams and Lawson conclude their paper with the follow- 

 ing statement, of great interest in connection with the Warwick 

 occurrences: '* That scapolite diorite, and transition rocks between 

 it and gabbro, identical with the Norwegian rocks, do occur in our 

 Laurentian System, associated with amphibolites and crystalline 

 limestones." 



Lacroix^ has recently reviewed the Norwegian localities anew 

 with many drawings of microscopic sections. The rocks described 

 from Brittany, in the same paper, are in instances much like ours. 

 M. Lacroix has also studied the geology of the scapolite of Canton, 

 St. Lawrence Co., N. Y., without, however, because of limited ex- 

 posures, establishing so fully, as in the other cases, its contact nature. 



In the contacts around Mt. Adam and Mt. Eve, those scapolites 

 that are disseminated in limestone in the bunches of silicates are 

 doubtless due to solutions, stimulated by the intrusive rock; but it 

 is quite likely that in the massive granitic mixture, forming the 

 characteristic scapolite zone, this mineral is an altered plagioclase. 

 It is a favorite secondary product after oligoclase, and possibly 

 this relatively basic feldspar has been the original of it. The in- 

 creasing basicity of the granite toward the contacts has already 

 been commented upon. If a portion of the limestone wall had been 

 fused into the granitic magma, such a mixture might readily be 

 explained. If the white limestone is metamorphosed blue, the 

 granite must be post-Cambrian. The Beemerville nepheline syenite 

 is later than the Oneida conglomerate at the base of the Upper 

 Silurian. 



The following propositions sum up the petrographical part of the 

 paper, after which some further stratigraphical notes are appended: 



1 On some Canadian Rocks containing Scapolite, etc., Canadian Record of 

 Science, iii,]85, 1888. 



2 Contributions a I'etude des gneiss a pyroxene et des roches a wernerite, 

 Bull. Soc. Fran, de Mineralogie, xii, 181, 1889. 



