Proceedings of the Estonian Academy of Sciences, Geology

6ojiee acritarchs AH SCTOHHH and/or Leptoplastus Zone Anticosti Island argillite BoopeMaa boring core M-72 CBHTH cemented conodont cusp Cymatiogalea wironia sp Dasydiacrodium caudatum dentalea sp denticles Deunff distal dumontii Eesti fine-dispersed pyrite genus Geology Geoloogia glauconite Goniosphaeridium sp Holotype ichnites Icriodella Icriognathus cornutus inner lateral view INQUA iron sulphide kongressi kvaternaari lateral denticles lateral process lattice parameter Llandovery Loeblich et Tappan marcasite Martin and Dean Middle Cambrian ning nonfurcated North Estonia number of processes Olikooli Operculum Ordovician P. W. Thomson Parabolina spinulosa Zone paspesa Paul Thomson Pb element PIRRUS polygonal fields prep Pterospathodus Puura pyrite pyrite knobs pyrite layer pyrite of variety Random Island samples of variety sandstone seams yielding variety siltstone Silurian siluricus specimens spinulosa Zone and/or Tallinn Tartu Teaduste TnxKBepe 726 Tremadocian Trunculumarium revinium Vanguestaine Tsitre Formation Upper Cambrian upper view Uyeno and Barnes vesicle vesicle and processes widened Zone and/or Leptoplastus