The Quarterly journal of the Geological Society of London . E,M,WiiliaL,ms. P.] ,P, -litK \J-Iarfia-rt imp COAL-PLANTS OF BRITISH ,Soc.^ol,XXll PI XHI. XM~W[h9yxxB SliCa . ¥:vt ijrq, COAL-PLAT^TS OF PRITISH N. AlvlEPlCA, 1865.] DAWSON COAL-FORMATION. 167 Fig. 11. The same : longitudinal section, magnified 90 diameters : a, one of theconcentric rings of compact coaly matter. 12. The same: portion of a cell showing areolation, natural size. 13. The same : transverse section, natural size: a, pith; b, wood, composed of alternate circles
The Quarterly journal of the Geological Society of London . E,M,WiiliaL,ms. P.] ,P, -litK \J-Iarfia-rt imp COAL-PLANTS OF BRITISH ,Soc.^ol,XXll PI XHI. XM~W[h9yxxB SliCa . ¥:vt ijrq, COAL-PLAT^TS OF PRITISH N. AlvlEPlCA, 1865.] DAWSON COAL-FORMATION. 167 Fig. 11. The same : longitudinal section, magnified 90 diameters : a, one of theconcentric rings of compact coaly matter. 12. The same: portion of a cell showing areolation, natural size. 13. The same : transverse section, natural size: a, pith; b, wood, composed of alternate circles of areolated cells and compact coaly matter; c,coaly bark. Plate 14. Araucarites gracilis: branch with leaves, three-fourths the natural Sigillaria Brownii: portion of two ribs, 4 feet above the level, one-halfthe natural size: a, cortical; h, decorticated. 16. The same : portion of one rib near the root, furrowed and with vascular scars widely separated. 17. The same: trunk 1 foot in diameter at the base, showing the origin of the ribs. 18. The same: photograph of a portion of the upper part of the stem, one-half the natural size. 19. The same: portion of the base
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
