Proceedings of the Estonian Academy of Sciences, Geology

AH SCTOHHH Ashgill basin Bekker Bekkerina BK/M Brachiopoda Caapce cipyKiyp coll concentration conodont conodont fauna conodont species core cycle Diagnosis dorsal interior dorsata early Llandovery—middle Llandovery Eesti extinction event ferrimagnetic Formation genera geniculation genus Geol H Ap high diversity episodes HIRM HJIH HOpOA imbrex Pander Ingria Ireviken Jaanusson Jeppsson KBapua KOTJIHHCKHX Kukruse Stage Lake Maardu Lasnamagi late Llandovery Llandeilo Llandovery Llanvirn lower lowermost Ludlow MaapAy magnetic analyses Magnetic susceptibility medial ridge MocKBa nopoA nopoAax nopoAbi North Estonia Opik Ordovician Oulodus Ozarkodina paAona Panderites paspesax Pavlovsk peak Pirgu Stage posterior posterolateral pseudoalternata Schmidt radiocarbon dates radon Rafinesquina Rakvere rocks S-ratio samples sand Sandvika SCTOHHH sediment succession sediments sepen septa silty gyttja Silurian socket plates Spjeldnaes stratigraphic STROPHOMENACEA Strophomenida subfamily Oepikinae Tallinn Tallinnites Tartu taxa taxon rate transmuscle septa Type species Uhaku Stage valve Velise ventral interior Ventral muscle field Wenlock