THE LATE PALEOZOIC BRACHIOPOD GENUS JAKUTOPRODUCTUS KASHIRTSEV 1959 AND THE JAKUTOPRODUCTUS-VERCHOYANICUS ZONE, NORTHERN YUKON-TERRITORY, CANADA

The familial and subfamilial position, species composition, and geogra phic distribution of the Late Palaeozoic productid genus Jakutoproduct us Kashirtsev 1959 are reviewed. Jakutoproductus is placed in the subf amily Plicatiferinae Muir-Wood & Cooper 1960 of the family Plicatiferi dae. Eighteen described species from the Russian Arctic, Mongolia, nor theast China, and northern Yukon Territory, Canada, are assigned to Ja kutoproductus. The Jakutoproductus verchoyanicus Zone of late Sakmaria n to Artinskian age, most likely early Artinskian (Aktastinian), here established is based on material from the Jungle Creek Formation. nort hern Yukon Territory, Canada. and is correlated with the following hor izons in Russia: the Osennin Horizon in the Verchoyan Mountains, the l ower Munugudjak Horizon of the Kolyma-Omolon Massif, the Hipkhoshin Su ite of east Zabaikal, the lower Birrang Horizon of Taimyr, and an unna med sandstone-shale unit on the north island of Novaya Zemlya.