. An old chapter of the geological record with a new interpretation, or, Rock-metamorphism (especially the methylosed kind) and its resultant imitations of organisms [microform] : with an introduction giving an annotated history of the controversy on the so-called " Eozoon canadense", and an appendix. Paleontology; Metamorphism (Geology); Paléontologie; Métamorphisme (Géologie). s;. XVI INTRODUCTION. thpy appear to consist of serpentine. The crystalloids of " white pyroxene " are strongly aflPected with cleavage, which is more or less represented by open gashesâthe openn
. An old chapter of the geological record with a new interpretation, or, Rock-metamorphism (especially the methylosed kind) and its resultant imitations of organisms [microform] : with an introduction giving an annotated history of the controversy on the so-called " Eozoon canadense", and an appendix. Paleontology; Metamorphism (Geology); Paléontologie; Métamorphisme (Géologie). s;. XVI INTRODUCTION. thpy appear to consist of serpentine. The crystalloids of " white pyroxene " are strongly aflPected with cleavage, which is more or less represented by open gashesâthe openness of which is disclosed by an infilling of calcite: it frequently happens that the cleavage is imperfectly developed, especially when the mineral is in a translucent condition; which is occasionally the case. The crystalloids when much gashed are reduced to plates more or less separated; and in many instances the plates are converted into fibres, somewhat mimetic of those characteristic of the "proper wall" (see woodcut, p. Ivii). No cases have cccurred to us of typical " canal ; In numerous cases the reduction of the crystalloids has resulted in the complete removal of their substance, and its replacement by calcite. Although our specimen of " Eozoon mineralized with loga- nite " differs from those which S. Hunt had under his observa- tion, we can quite conceive the existence of specimens of the latter kind, inasmuch as the crystalloids through solvent action may have disappeared altogether, and been replaced by " ferri- ferous ; The specimen closely corresponds with a rock occurring in Connemara, made up of layers of serpentine and malacolite, and which we have elsewhere (p. 2) called malacolophyte: the resemblance is so close that the crystalloids of malacolite in the latter are widely gashed with corroded cleavage, and the gashes similarly filled with calcite. This peculiarity is so much de- veloped that when
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