Abstract
Three new spiriferid species are established from the Mongolian key sections of the Middle Permian Tsagaan-Temete horizon and Late Permian Binder horizon, Uldza formation. Crassispirifer galinae sp. nov. (order Spiriferida) and Tumarinia uldsiensis sp. nov. (order Spiriferinida) were found in the inequigranular sandstones of Tsagaan-Temete Horizon of Mts. Tsagaan-Temete and Tavan-Tologoi, Uldza Permian Field, northeastern Mongolia. Few molds and imprints of Neospirifer borealis sp. nov. (order Spiriferida) were collected from the interbedding series of calcareous siltstones and sandstones of Binder horizon, upper Uldza subformation, key section on the slope of Mt. Ikh-Uldziit on the left bank of the Khurakhu Gol River.
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