. Relics of primeval life, beginning of life in the dawn of geological time. STEM), 1865.—Diorites, felsites, petrosilex, etc. ; resembling the Arvonian rocks of Dr,Hicks. Thickness more than . . Upper series (or system) of LaurenTiAN, 1872. Upper division. — Argillites, lime-stones, graphitic shales. Fossils. Inupper part of the upper limestones of theSouth basin, fragmental Eozoon, observedby Sir J. W. Dawson in specimens senthim. In middle of upper limestones inMiddle basin, spicules of sponges. Ingraphitic shale of South basin, spiculesof Halicho7tdrites graphitiferus. In low-est limestone
. Relics of primeval life, beginning of life in the dawn of geological time. STEM), 1865.—Diorites, felsites, petrosilex, etc. ; resembling the Arvonian rocks of Dr,Hicks. Thickness more than . . Upper series (or system) of LaurenTiAN, 1872. Upper division. — Argillites, lime-stones, graphitic shales. Fossils. Inupper part of the upper limestones of theSouth basin, fragmental Eozoon, observedby Sir J. W. Dawson in specimens senthim. In middle of upper limestones inMiddle basin, spicules of sponges. Ingraphitic shale of South basin, spiculesof Halicho7tdrites graphitiferus. In low-est limestone of the Middle basin, thereef of columnar fossils described as Archreozoon . Middle division. — Quartzites, sili- cious schists, Fossils Cyatlwspongia (?) eozoica near the top of this division . Lower division. — Limestones and gneisses. No Fossils known Lower series of Laurentian.—Gneisses, Micaschists, etc ThicknessFeet. 10,000 5,000 740 450 260 ^ The above thicknesses are on the authority of Dr. Bailey. Report Progress Geological Survey Canada^ 1879,. i ^ z ^ > 5 <-. - i r. V -S I -5 ^
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