. On the history of Eozoön Canadense [microform]. Paleontology; Foraminifera; Paléontologie; Foraminifères. I to CO s I .2 e .2> a .2 C^ a .2 60 I OS ^ a. a o si M a « a) o si 6j^ • -< O] s! a 5si 'a 5 s s « « lowed by many more. Although the Lower and Upper Laurentian rooks spread over more than 200,000 sqt ire miles in Canada, only about 1500 square miles have yet been fully and connectedly examined in any one district, and it is still impossible to say whether the numerous exposures of Lau- rentian limestone met with in other parts of the province are equivalent to any of the thr
. On the history of Eozoön Canadense [microform]. Paleontology; Foraminifera; Paléontologie; Foraminifères. I to CO s I .2 e .2> a .2 C^ a .2 60 I OS ^ a. a o si M a « a) o si 6j^ • -< O] s! a 5si 'a 5 s s « « lowed by many more. Although the Lower and Upper Laurentian rooks spread over more than 200,000 sqt ire miles in Canada, only about 1500 square miles have yet been fully and connectedly examined in any one district, and it is still impossible to say whether the numerous exposures of Lau- rentian limestone met with in other parts of the province are equivalent to any of the three zones, or whether they overlie or un- derlie them all. Fig. 2.—Section aavss Trembling Mountain (21 miles).. 6. Upper Laurentian. c. Fourth gneiss. d\ Third limestone. d. Third gneiss. e'. Second limestone. e. Second gneiss. f. First limestone. /. First gneiss. In the examination of these ancient rocks, the question often naturally occurred to me whether, during these remote periods, organic life had yet appeared on the earth. The apparent abseuce of fossils from the highly crystalline limestones did not seem to ofiFer a proof in negation, any more than their undiscovered presence in newer crystalline limestones, where we have little doubt they have been obliterated by metamorphic action; while the carbon which, in the form of graphite, constitutes beds, or is disseminated through the calca- reous or siliceous strata of the Laurentian series, seemed to be an evidence of the ex- istence of vegetation, since no one disputes the organic origin of this mineral in more recent rocks. My colleague, Dr. T. Sterry. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Logan, W. E. (William Edmond), Sir, 1798-1875. Montreal : [s. n. ]
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