508 



J. A. DRESSER IGNEOUS ROCKS OF EASTERN QUEBEC 



their Calciferous or Chazy age. The fossils, which are referred to by 

 the late Sir William Dawson in an article entitled "On Palaeozoic fossils 

 mineralized with silicates,"* occur in lot 14, range xn, of the township 

 of Cleveland, about 300 yards east of the Healy schoolhouse. 



In this article the fossils were referred to as of Lower Silurian age, 

 and the genera Stenopora and Ptilodictya are mentioned, but no more 

 definite description seems to have been yet published. 



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Limestone, Trenton. 



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Mica schist, No. 4- \mapped Pre -Cambrian 



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Dolomite , Nc:5. J except within line D-D'. 



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Strike, Dip A40° 



Figure 1.— Lots IS, 1U, 15, Ranges XII and XIII, Township of Cleveland 



The importance of this occurrence of fossils seems to have been lost 

 sight of in the more recent maps of the Geological Survey, for it has been 

 erroneously connected with the black limestone (number 13 in the above 

 section), which has long been known to be fossiliferous and which lies 

 three-quarters of a mile distant. Thus, in the Sherbrooke and the Mon- 

 treal sheets of the Eastern Townships map,f the locality of these fossils 

 is included in the Trenton area by a peculiar indentation, D-D' (figure 1), 

 in the part colored pre-Cambrian, the boundaries of which are thus made 

 to cross the actual stratification of the rocks. The part of the dolomite B 

 immediately surrounding the locality of the fossils and the intervening 

 mica-schists are accordingly colored Trenton in lots 13, 14, and 15, while 



♦Quarterly Journal, Geological Society, London, Eng-, February, 1879, pp. G0-62. 

 t Geological Survey of Canada, 1886-1894. 



