Figure 1
Distribution of major Tremadocian facies in the northern and central parts of East Baltica with setting of glendonite localities; (a) facies map (after5,6) showing: A, quartzose sand and sandstone (nearshore); B, quartzose sand rich in obolid brachiopods (nearshore); C, fine-grained sand with black shale interbeds (offshore); D, detrital sand with abundant obolid brachiopods (beach and bar systems); E, fine-grained sandstone and shale (offshore to basinal); F, black graptolitic shale (basinal); G, exposure of Tremadocian strata; H, boreholes; I, glendonite localities; geographical areas: 1, North Estonia and St Petersburg region; 2, Moscow Basin; 3, Jelgava depression; 4, Öland and Småland; 5, Scania-Bornholm; 6, Östergötland-Närke-Västergötland; 7, Oslo Region; 8, Łeba area; 9, Łeba-Gdaǹsk area; 10, Podlasie depression; 11, Siljan, 12, Bothnian Sea; 13, Kolguev Island; palaeolatitudes for Tremadocian after67; (b) schematic map of the Baltic-Ladoga Clint area showing position of glendonite and phosphorite localities; modified after6. New (prepared by MGP in Corel Draw 15, https://www.corel.com/en/products/coreldraw/).
