Image data and figures of holotypes of small carbonaceous fossils from Cambrian sediments of the Baltic Basin. Also included are sampling information and fossil measurement data. Data collected from Sweden (mainland and Baltic islands) and Estonia (northern coastline). This information is relevant to the following publications: Slater, B.J., Harvey, T.H., Guilbaud, R. and Butterfield, N.J., 2017. A cryptic record of Burgess Shale-type diversity from the early Cambrian of Baltica. Palaeontology, 60(1), pp.117-140. http://onlinelibrary.wiley.com/doi/10.1111/pala.12273/full Slater, B.J., Harvey, T.H. and Butterfield, N.J., 2018. Small carbonaceous fossils (SCFs) from the Terreneuvian (lower Cambrian) of Baltica. Palaeontology, In Press. Guilbaud, R., Slater, B.J., Poulton, S.W., Harvey, T.H., Brocks, J.J., Nettersheim, B.J. and Butterfield, N.J., 2018. Oxygen minimum zones in the early Cambrian ocean. Geochemical Perspectives Letters, In Press.