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Estonian Geological Sections. Bulletins 1...7 (22.01.07)
 Detailed restudy of high-quality drill cores has been carried out at the Geological Survey of Estonia since 1995. The cores are photographed and thoroughly described. For the problematic parts of the sections, additional micropalaeontological analyses are performed. Clastic sediments, carbonate and crystalline basement rocks are examined using different methods. The lithological descriptions of the cores are supplemented by profiles, photo-logs and generally accepted legends, providing information on the mineral composition and other characteristics of the rock. In 1998 the journal Estonian Geological Sections was started in order to disseminate the findings. The seven issues published give an overview of the lithology and stratigraphy of the Tartu (453), Taga-Roostoja (25A), Valga (10), Soovälja (K–1), Ruhnu (500), Mehikoorma (421) and Kerguta (565) cores (see Table 1, Table 2). The issue on the Soovälja (K–1) core includes data from the deepest drill hole (815.2 m) in Estonia, made in the Kärdla meteorite crater in the course of geological deep mapping of Hiiumaa Island in 1990. The Ordovician section of the Ruhnu (500), Mehikoorma (421) and Kerguta (565) cores has additionally been studied for stable isotopes. The lower Silurian part has been studied only in the Ruhnu (500) core. The appendixes of the Ruhnu (500), Mehikoorma (421) and Kerguta (565) issues (photos and descriptions of selected intervals and thin sections, laboratory data, and drawings illustrating the relationship of rock types and sedimentary structures in combination with fossils distribution and stratigraphic scale) are written on the CD-ROM.
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