[HOWARD] SOME OUTLIERS OF THE MONTEREGIAN HILLS 91 



Analyst Symbol 



I. Monticellite alnoite, Como W. V. Howard IV. 2. 5. 2. 2 



II. Monchiquite, Ste. Monique W. V. Howard IV. 2. 5. 3. 2 



III. Biotite-Peridotite, La Trappe E. P. Dolan V. (1) 2. 4(5). (2) 



3. 2 



IV. Camptonite, Husereau W. V. Howard (III) IV. 2. 5. 2. 2 



VI. Monticellite alnoite (melilite — rich), 



Isle Cadieux H. S. Washington IV. (1) 2. 5. 2. 1 



VII. Monticellite alnoite (melilite — poor), 



Isle Cadieux H.S. Washington IV. (1) 2.5.2.(1)2 



VIII. Melilite-biotite rock, Isle Cadieux H. S. Washington III(IV). 6. 2. 3 



IX. Alnoite, Ste. Anne de Bellevue P. H. LeRossignol III. 7. 3. 3 



l". 5. (1) 2. (1) 2 



X. Alnoite Point St. Charles M, F. Connor III. 7. 3. 3 



2" .(4)5.2.2 

 a Norm calculated by H. S. Washington. All others by W. V. Howard. 

 In IX it was assumed that C02 = ^ (H2O + CO2) This norm would probably be 

 much altered had CO2 and P2O6 been determined. Si02 is high and Ti02 low. 



These basic rocks, therefore, may be classified as follows: 

 III. 6. 2. 3. (2. 5. 3. 2) 

 Melilite-biotite rock, Isle Cadieux 



III. 7. 3. 3. (1 or 2. 5. 2. 2) 

 Alnoite, Ste. Anne de Bellevue 

 Alnoite, Point St. Charles 



IV. 2. 5. 2. 1 



Monticellite alnoite (melilite — rich), Isle Cadieux 



IV. 2. 5. 2. 2 



Monticellite alnoite, Como 



Camptonite, Husereau 



Monticellite alnoite (melilite — poor), Isle Cadieux 



IV. 2. 5. 3. 2 

 Monchiquite, Ste. Monique 



V. 2. 4. 3. 2 

 Biotite-Peridotite, La Trappe 



Thus there is no doubt but that they are genetically related. As 

 the relationship between alnoitic rocks and the breccias has been 

 pointed out by Harvie, it seems logical to consider them to be roughly 

 contemporaneous. 



Harvie points out in his paper (page 260) that the breccia on 

 the southwest end of Isle Bizard contains fragments of pyroxenites 

 and hornblende rocks and (page 269) that the breccia on Westmount 

 Mountain contains essexite and a pyroxene-hornblende rock. These 

 essexites and pyroxene hornblende rocks represent the earlier 

 intrusive at Mount Royal, namely, the essexite. The breccias and 



