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FIGURE 1. Map illustrating the exposure of the Ordovician in Estonia and location of studied localities. 1- Saxby North, 2- Saxby, 3- Hosholm, 4- Paluküla, 5- Vohilaid, 6- Sutlema.

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FIGURE 2. Stratigraphy of the upper Katian of NW Estonia. Occurrence of endobionts indicated with asterisk.

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FIGURE 3. A, Cornulites sp. (Corn) and Chaetosalpinx isp. (Chaet) in Protoheliolites norvegicus from the Adila Formation, Hosholm, Vormsi Island (GIT 840-35). Note the downward-bending lamellae of Protoheliolites norvegicus in the upper half of the bioclaustration. B, Cornulites sp. in stromatoporoid from the Kõrgessaare Formation, Saxby North, Vormsi Island (GIT 529-95-2). C, Lingulate in Propora sp. from the Kõrgessaare Formation, Saxby North, Vormsi Island (GIT 520-155-2). D, Lingulate Rowellella sp. in Diplotrypa densitabulata from the Kõrgessaare Formation, Saxby North, Vormsi Island (GIT 843-15-1).

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FIGURE 4. Chaetosalpinx -like bioclaustration in Diplotrypa densitabulata from the Kõrgessaare Formation, Saxby North, Vormsi Island (GIT 843-31). Arrows point to the bioclaustration.

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