Uralinia simplex ( Yü, 1933 )

Denayer, Julien, 2016, Rugose corals across the Devonian-Carboniferous boundary in NW Turkey, Acta Palaeontologica Polonica 61 (1), pp. 51-70 : 61-63

Uralinia simplex ( Yü, 1933)

Fig. 8F, G .

1933 Pseudouralinia tangpakouensis var. simplex ; Yü 1933: 60, pl. 5: 6.

1963 Pseudouralinia tangpakouensis simplex Yü ; Yü 1963: 144, pl. 35: 4.

1963 Pseudouralinia simplex ; Fan 1963: 277, pl. 1: 5a–c.

Holotype: Specimen IPG-4938.

Type locality: Kolaoho, Guizhou, SE China.

Type horizon: Lower Tournaisian Tangpakou Formation.

Diagnosis.—See Yü (1933).

Material.—Nine specimens (12 TS, 2 LS) from Topluca (Bartın), lower Tournaisian.

Description.—The coralla are eroded and the thickened septa of the cardinal quadrants are usually the only preserved parts. The approximate diameter of the tabularium varies from 12 to 22 mm, depending on the erosion of peripheral parts. There are 28 septa in average (maximum 30). They are undulating, irregularly thickened but separated from each other, some interseptal dissepiments occupying the space between them. Their axial ends are sharp, except for the cardinal-lateral septa that develop rhopaloid ends. The cardinal septum is shorter and quite undulating. The cardinal fossula is poorly marked. Some interseptal and lonsdaleoid dissepiments are present in the counter side.

Remarks.— Uralinia simplex ( Yü, 1933) is similar to U. tangpakouensis ( Yü, 1931) by its irregular form, its sharp septa and its narrow lonsdaleoid dissepimentarium. It differs from the latter by lesser dimensions (12–20 mm versus 30–50 mm for U. tangpakouensis ) and less septa (30 versus 30–50). Moreover, the septa are shorter and thicker in the cardinal quadrants in U. simplex .

Stratigraphic and geographic range.—In S China, U. simplex and U. tangpakouensis are the guide taxa for the lower Tournaisian U. tangpakouensis Zone of Tan et al. (1987), corresponding to the rugose coral RC1γ–RC2 subzones of Poty et al. (2006). In NW Turkey, the species occurs in the light bioclastic limestone of the lower Tournaisian part of the Yılanlı Formation in Bartın area. In equivalent levels of the Gökgöl section, only fragments of tabularium with thickened septa are questionably attributed to U. simplex . The foraminifers associated with the corals indicate the MFZ2 biozone of Poty et al. (2006).

Figures

Fig. 8. Devonian–Carboniferous rugose corals from Turkey. A–E. Caninophyllum charli sp. nov. from the lower Tournaisian (upper Hastarian) of Zonguldak, Gökgöl section. A. Holotype, G.8.1.1, successive TS (A1, A2); close-up view of the dissepimentarium, TS (A3). B. G.8.6.1, successive TS (B1, B2). C. G.8.4.3, TS. D. G.8.4.2, TS. E. G.8.3.2, LS. F, G. Uralinia simplex (Yü, 1933) from the lower Tournaisian (lower Hastarian) of Bartın, Topluca section. F. ET.9c.7, TS. G. ET.9c.8, TS. H. Amplexocarinia rozkowskae (Fedorowski, 2003) from the uppermost Famennian (Strunian) of Bartın, Dallıca section, D.2.4.II’, TS. I.?Metriophyllum sp. from the uppermost Famennian (Strunian) of Bartın, Topluca section, ET.11.X, TS. J–L. Bounophyllum praecursor (Frech, 1895) form the uppermost Famennian (Strunian) of Bartın, Topluca section. J. ET.12a.1.III, successive TS (J1–J3). K. ET.12a.1.II, TS. L. ET.12a.1.V, LS. Scale bar A–G, 5 mm; H, 3 mm; I, 1.9 mm; J–L, 2.5 mm.