. Relics of primeval life, beginning of life in the dawn of geological time. dvariety minora ^ All this, however, has nothing to do with the layersof fragments of Eozoon which are scattered throughthe Laurentian limestones. In these the fossil issometimes preserved in the ordinary manner, with itscavities filled with serpentine, and the thicker parts ofthe skeleton having their canals filled with this sub-stance. In this case the chambers may have beenoccupied with serpentine before it was broken St. Pierre there are distinct layers of this kind,from half an inch to several inches in thi
. Relics of primeval life, beginning of life in the dawn of geological time. dvariety minora ^ All this, however, has nothing to do with the layersof fragments of Eozoon which are scattered throughthe Laurentian limestones. In these the fossil issometimes preserved in the ordinary manner, with itscavities filled with serpentine, and the thicker parts ofthe skeleton having their canals filled with this sub-stance. In this case the chambers may have beenoccupied with serpentine before it was broken St. Pierre there are distinct layers of this kind,from half an inch to several inches in thickness,regularly interstratified with the ordinary other layers no serpentine occurs, but the inter-stices of the fragments are filled with crystallinedolomite or magnesian limestone, which has alsopenetrated the canals ; and there are indications,though less manifest, that some at least of thelayers of pure limestone are composed of fragmentalEozoon. In the Laurentian limestone of Wentworth, ** Annals and Magazine of Natural History^ Sen 4, vol.
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