. Catalogue of the Mesozoic plants in the Department of geology, British museum (Natural history) [Part III-IV] The Jurassic flora. Paleobotany; Paleobotany. JET. 71 51,593, 51,594. Pure jet similar to ttat shown in PI. VIII. Pig. 3, but in this case the arrangement of the longer dark bands across the fainter vertical lines shows that the section has been cut in a radial longitudinal direction. Eadial longitudinal section of jet, but darker and less transparent than 51,593 and 51,594. Probably a tangential longitudinal section, similar to that shown in Fig. 3, PI. VIII.
. Catalogue of the Mesozoic plants in the Department of geology, British museum (Natural history) [Part III-IV] The Jurassic flora. Paleobotany; Paleobotany. JET. 71 51,593, 51,594. Pure jet similar to ttat shown in PI. VIII. Pig. 3, but in this case the arrangement of the longer dark bands across the fainter vertical lines shows that the section has been cut in a radial longitudinal direction. Eadial longitudinal section of jet, but darker and less transparent than 51,593 and 51,594. Probably a tangential longitudinal section, similar to that shown in Fig. 3, PI. VIII. Longitudinal radial section showing the tracheal walls as vertical lines crossed at right angles by rows of dark dots representing medullary-ray Fig. 7.—Coniferous wood partly converted into jet. Highly magnified. 51,448. Transverse section like that reproduced in Text-fig. 7, but darker. A good example of pure jet in transverse section ; the rich sherry - coloured matrix is traversed by parallel contorted bands, as in PI. VIII. Fig. 7, and shows traces of the tracheal walls as a faint network of fine lines. 51,621. A small section of jet almost entirely without signs of structure. Under a high power it presents the appearance of. 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 British Museum (Natural History). Dept. of Geology; Seward, A. C. (Albert Charles), 1863-1941. London, The Trustees
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