. Relics of primeval life [microform] : beginning of life in the dawn of geological time. Paleontology; Paléontologie. nt of :h r, â â %â LAURENTIAN LIFE H3 derived from the decay of their own organic substance. The crystalline Trenton limestone of Montreal, used there as a building stone, is an excel- lent example (Fig. 22). It is otherwise, however, when the calcareous fossils have been filled or injected with some mineral matter different from the matrix, as, for example, silica or some silicate, oxide or sulphide of iron. i%T!Tt » 6 « I iiriiJ â¢â¦Ml If â¢Â» I â¢â¢â¢â¢I t < 11»⢠ii
. Relics of primeval life [microform] : beginning of life in the dawn of geological time. Paleontology; Paléontologie. nt of :h r, â â %â LAURENTIAN LIFE H3 derived from the decay of their own organic substance. The crystalline Trenton limestone of Montreal, used there as a building stone, is an excel- lent example (Fig. 22). It is otherwise, however, when the calcareous fossils have been filled or injected with some mineral matter different from the matrix, as, for example, silica or some silicate, oxide or sulphide of iron. i%T!Tt » 6 « I iiriiJ â¢â¦Ml If â¢Â» I â¢â¢â¢â¢I t < 11»⢠ii»«f»i; â¢Â»<««. Fig. 23.~£>ta^am of different States of Fossilizalion of the Cell of a Tubulate Coral. ^"^ S'"^ii^°:S" "^^'i^^^ ^'-^T^Y^^T' «"â¢"- ^='-- conditions are found in the fosJil coLhnf,hf^ ''"r'^ ''^'",'? '"''*=^- A" '^ese -Middle Permian. °^ '^^ corniferous Limestone of Canada In this case the texture, colour, or hardness of the filling appear different from those of the limestone, and may be seen in a fresh fracture or polished slice; or when the rock is weathered, the hard mine- ralizing substance may project from the surface of the specimens, or may be disclosed by treating the surface with a weak acid. The figures here given may suffice to show some of these conditions of 8. 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 Dawson, J. W. (John William), Sir, 1820-1899. New York; Toronto : F. H. Revell
Size: 1723px × 1449px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectpaleontology, bookyea
