. Relics of primeval life, beginning of life in the dawn of geological time. Vv;vivv*^-< |-J/^/,^. Fig. 45.—Tubular Strutuite of Ccenostroma, Silurian. and which, when sliced and studied microscopically,are found to consist of concentric thin laminae filledin between with a porous mass of calcareous matterpenetrated by an infinity of. tortuous tubes. Formsof this kind have been traced downward into pre-Cambrian beds in Colorado, and as we shall find inNew Brunswick, into the Upper Laurentian present, however, structural differences from ^ See Figs. 7 and 8, pp. yj^ 39; also Fig.
. Relics of primeval life, beginning of life in the dawn of geological time. Vv;vivv*^-< |-J/^/,^. Fig. 45.—Tubular Strutuite of Ccenostroma, Silurian. and which, when sliced and studied microscopically,are found to consist of concentric thin laminae filledin between with a porous mass of calcareous matterpenetrated by an infinity of. tortuous tubes. Formsof this kind have been traced downward into pre-Cambrian beds in Colorado, and as we shall find inNew Brunswick, into the Upper Laurentian present, however, structural differences from ^ See Figs. 7 and 8, pp. yj^ 39; also Fig. 8 and Microscopicslice, Fig. 61, at end. THE DAWN OF LIFE 175 Eozoon, which rather conforms to the arrange-ments found in some Protozoa of smaller size, andwhich, under the name of Foraminifera, haveabounded in all geological periods, and are exces-sively abundant in the modern ocean. They maybe defined as animals composed of a soft andapparently homogeneous animal jelly known asprotoplasm or sarcode. When carefully examined,however, it is found to have a granular texture andto be divisible in
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