چینه نگاری نهشته های دونین فوقانی در برش کلاریز

:Abstract

Geirud formation deposits of Kalariz in east Alborz ar began with a relatively thick sequence of sandstone, shale and red to white color siltstone and them changed into yellow dolomitic layers, fossiliferous limestone and shaly or marly limestone. In the above mentioned sequence numerous and various fossils of Conodonts, and Brachiopods have been identified.On the distributionof Brachiopoda two assemblage zone and on the Conodonts, four assemblage zone distinguished, with middle- late Famennian and Strunian age. Brachiopoda biozone of number one, equivalent to Conodont biozone of number one with middle Famennian age (upper marginifera - lower postera zone) . Brachiopoda biozone of number two, equivalent to Conodont biozone of numbers two, three and four with late famennian (middle postera to upper praesulcata zone). Evidences show that there are not Frasnian sediment in studid region.