PALAEOZOIC/Silurian 187 Figure Correlation of key Silurian sections in New York State, Anticosti Island (Canada), the Oslo Region of Norway, the island of Gotland (Sweden), and the northern area of Estonia (Reproduced from Cocks LRM, Holland CH, and Rickards RB (1992) A Revised Correlation of Silurian Rocks in the British Isles Special Report 21 London: Geological Society.) graptolite Biozone The Aeronian is represented at Llandovery by over 450 m of rocks carrying, once again, an abundant macrofauna, microfauna, and microflora, including two more Stricklandia brachiopod species Also present for the first time are two species of the rhynchonellide Eocoelia, a brachiopod genus that, in the upper half of the Llandovery, evolved even more quickly than Stricklandi and whose species are therefore invaluable for detailed correlation The Aeronian formations at