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The next areas of the Laurentian rock, which occur in a westward 

 direction, are found in the township of Grenville, on the Ottawa 

 River, Province of Quebec, where it is massive and nearly pure. Its 

 colour is generally pale-yellowish, wax-yellow, or greyish-green, unless 

 it has been penetrated in parts by red peroxyd ot iron. In the serpentine 

 of this township have been found very good specimens of Eozoon Cana- 

 dense. A white lamellar dolomite from this township contains a large 

 proportion of grains of honey-yellow serpentine. 



Serpentine rocks analogous to these last are found in the seigniory 

 of La Petite Nation, which adjoins the Township of Grenville. The 

 serpentinous structure of the Eozoon Canadense is beautifully shown in 

 many places in this seigniory, and the best specimens of that fossil ex- 

 hibited in our museum were first collected there by Mr. James Lowe, 

 who was for some time attached to the Geological Survey staff. Pro- 

 ceeding westward we find serpentinous rock in the Township of Tem- 

 pleton, where it is associated with the so well known mineral apatite* 

 About 50 miles farther west, at the Calumet Falls, on the Ottawa 

 River, pale green serpentine, associated with brown phlogopite and 

 apatite, in a white crystalline limestone, has been described under the 

 name of loganite. To trace the Laurentian serpentine westward we 

 shall have now to cross the Ottawa River and enter the Province of 

 Ontario, where it is first seen in the Township of Ramsay, Lanark 

 County, and about 30 miles south-west of the Township of Templeton. 

 It appears there sometimes of a beautiful amber-color, and in some 

 parts of the township the mineral occurs entirely as disseminated grains 

 through a pure white carbonate of lime, while in others it is distributed 

 in lumps or patches from the size of a pea to that of a medium sized 

 cannon ball. We find very analogous serpentine in Lanark township, 

 and where this mineral is interstratified with the limestone, it forms a 

 rock of striking beauty. On lots 23 and 24, range 3, Township of Dal- 

 housie, the serpentine is interlaminated with a finely granular and 

 brov* n-weathering crystalline limestone, which, on its weathered surfaces- 

 shows forms very much resembling Eozoon. Similar limestone, with- 

 out Eozoon structure, is found on lots 26 and 2", ranee 2. 



In the township of South Sherbrooke, which lies due south of the 

 township of Dalhousie, can be seen spotted serpentine limestones which 



