. Bulletin of the British Museum (Natural History), Geology. ORDOVICIAN-SILURIAN BOUNDARY IN CUMBRIA 61 20 cm ill! Volcanic clay Black shale Blotchy siltstone Green siltstone Calcareous siltstone Rottenstone breccia OO Calcareous nodules Limestone SILURIAN ORDOVICIAN. || P. acuminatus Q. persculptus Hirnantia shelly fauna Fig. 2 The lithological log obtained for the trench cutting across the quarry track of Fig. 1, showing the position of the Ordovician-Silurian boundary. Numbers of lithological units discussed in the text are as in Wright (1985). The black spots and bars to the right
. Bulletin of the British Museum (Natural History), Geology. ORDOVICIAN-SILURIAN BOUNDARY IN CUMBRIA 61 20 cm ill! Volcanic clay Black shale Blotchy siltstone Green siltstone Calcareous siltstone Rottenstone breccia OO Calcareous nodules Limestone SILURIAN ORDOVICIAN. || P. acuminatus Q. persculptus Hirnantia shelly fauna Fig. 2 The lithological log obtained for the trench cutting across the quarry track of Fig. 1, showing the position of the Ordovician-Silurian boundary. Numbers of lithological units discussed in the text are as in Wright (1985). The black spots and bars to the right of the log respectively indicate specific horizons or bulk samples yielding graptolite 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). London : BM(NH)
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