. Bulletin of the British Museum (Natural History), Geology. 86 KALJO, NESTOR & POLMA. Fig. 1 Distribution of Ordovician-Silurian boundary rocks in the East Baltic area. 1—boreholes, 2—administrative boundaries, 3—outer margin of the distribution of Ashgill and Llandovery rocks, 4—boundaries of main types of sections, marked with Roman numbers. and the boundary of the systems continues in a comparatively monotonous complex of nodular limestones and marls. In places the Porkuni Regional Stage may be missing. Type III—sections in south Estonia and north-west Latvia. Marls and argillaceous li
. Bulletin of the British Museum (Natural History), Geology. 86 KALJO, NESTOR & POLMA. Fig. 1 Distribution of Ordovician-Silurian boundary rocks in the East Baltic area. 1—boreholes, 2—administrative boundaries, 3—outer margin of the distribution of Ashgill and Llandovery rocks, 4—boundaries of main types of sections, marked with Roman numbers. and the boundary of the systems continues in a comparatively monotonous complex of nodular limestones and marls. In places the Porkuni Regional Stage may be missing. Type III—sections in south Estonia and north-west Latvia. Marls and argillaceous lime- stones, including their red-coloured varieties, are significant lithologies. In the Llandovery, aphanitic limestones alternate with marls. A considerable erosional gap corresponds to the upper part of the Pirgu Regional Stage, and this gap increases westwards. The uppermost. 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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