The Quarterly journal of the Geological Society of London . arent 210 diameters. From a Moss-agate presented by Pro-fessor Tennant. 17. An amorphous mass, representing the canal-system, of a prismatic structure, lying in a decalcified passage, c, between four irregular-shaped granules of serpentine, a. The mass, b, at its sides, is sepa-rated into prisms, wliidi curve oiF, and in a few places becomebranched; it is, for the most part, however, compactly prismatic, andhas an incipient lustre. Magnified 60 diameters. From Grenville. 18. Representation, natural size, of a botr
The Quarterly journal of the Geological Society of London . arent 210 diameters. From a Moss-agate presented by Pro-fessor Tennant. 17. An amorphous mass, representing the canal-system, of a prismatic structure, lying in a decalcified passage, c, between four irregular-shaped granules of serpentine, a. The mass, b, at its sides, is sepa-rated into prisms, wliidi curve oiF, and in a few places becomebranched; it is, for the most part, however, compactly prismatic, andhas an incipient lustre. Magnified 60 diameters. From Grenville. 18. Representation, natural size, of a botryoidal specimen of Permian lime- stone, from Building Hill (Peoples Park), near Sunderland. Therounded and irregular-shaped bodies, formed of brown subcrystallinecarbonate of lime, simulate the ?^chamber-casts of ^^Eozoon Cana-dense: the vacant spaces, once filled with earthy carbonate of limeand magnesia (which has been weathered out), correspond to the- decalcified-passages or the so-called calcareous skeleton. Quart Journ .&eol SocYol IXII PI EMWmiams ¥. HsmKa-r-t imp EO-ZOONAL TIOCKS Journ.,C;, PI XIV.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
