اولين مطالعه بريوزوئرهاي سازند جيرود در البرزي مركزي

The First Study of Bryozoans from the Geirud Formation in Central Alborz

Two bryozoan species are described from the Oeirud Formation (Upper Devonian) of Central Alborz. The Oeirud Formation is a sequence of nearly 340 meters of alternating silisiclasrics and limestone and 1-2 andesitic lava units, with extensive exposures in the Central Alborz mountains. The study comprises the Type Section of the Geirud Formation in the Oeirud valley and two sections in Zaigun and Lalun valleys near the Type Section, all in northern Tehran (Fig.!). In some calcareous beds we found bryozoan species from Famennian. Trepostome Schulgina mutabtlis TR01ZKAYA, 1975 is known from the Upper Devonian (Famennian) of Central Kazakhstan. The Ascopora .sp. is the earliest known representative of habdomesine genus Ascopora TRAUTSCHOLD, 1876. This is the first study on the bryozoans of the Oeirud Formation in Central Alborz