Smithicyathus cf. smithi ( Różkowska, 1953 )

Wrzołek, Tomasz, 2007, A revision of the Devonian rugosan phillipsastreid genus Smithicyathus, Acta Palaeontologica Polonica 52 (3), pp. 609-632 : 626

Smithicyathus cf. smithi ( Różkowska, 1953)

Fig. 11A, B .

Discussion.—The two Upper Frasnian colonies, one from Panek, the other from Zgórsko, are with high atypicality indices (GIUS 384P101 and GIUS382ZS05, listed as P101 and ZS05 in Table 2). Their septa are rather thin and with carinate appearance, short in tabularium ( Fig. 11A 1, B 1 ). Horseshoe dissepiments are present in the longitudinal sections ( Fig. 11A 2, B 2 ). The colony from Zgórsko is with much smaller corallites than in the specimen from Panek. Some similarity of this material to Frechastraea carinata Scrutton, 1968 from the Upper Frasnian of Devonshire ( Scrutton 1968) can be noted, but the latter species is with stronger carination and without the horseshoe dissepiments.

Figures

Fig. 11. Upper Frasnian massive material of Smithicyathus from the Holy Cross Mountains (A, B) and the Lublin area (eastern Poland) subsurface (C). A, B. Smithicyathus cf. smithi (Różkowska, 1953) with relatively thin septa. A. Panek quarry, set B, GIUS 384P101, with larger corallites and better development of horseshoe dissepiments (A1 transverse, A2 longitudinal section).B. Zgórsko quarry, GIUS 382ZS 05, with small corallites, carinated septa and relatively scarce horseshoe dissepiments (B1 transverse, B2 longitudinal section). C. Smithicyathus lubliniensis Różkowska, 1980, possibly cut from the holotype of the species, Korczmin borehole, depth 1891 m, UAM material marked as Korczmin 1891A, from collection of Różkowska (1980), with narrow zone of septal expansion, marked intercorallite non−cerioid walls and with narrow dissepimentaria, (C1 transverse, C2 longitudinal section). Scale bar 4 mm for all items.

Fig. 1. Geography of the Devonian World, after Scotese and McKerrow (1990: fig. 15) with locations, yielding material for the present study. Locations with Smithicyathus: A, Western Canada; B, Holy Cross Mountains (see Figs. 2, 3); C, Lublin area; D, Moravia.Locations with dubious Smithicyathus: E, New Siberian Islands; F, NE Siberia. Additional locations with comparative material: G, New Mexico; H, Harz Mountains; I, Urals; J, Kuzbass; K, South China.

Fig. 2. Schematical geological map of the Devonian outcrop (shaded) in the Holy Cross Mountains, central Poland (after Dzik 2002: fig. 1A), with the main marine Devonian facies belts marked and with indicated coral−bearing sites mentioned in this paper: G, Grabina; JB, environs of Jaźwica quarry; KD, Kowala road cutting; KK, Kowala quarry; M, Miedzianka; P, Panek; PG, Psie Górki; SW, Sobiekurów; W, Wietrznia; ZS, Zgórsko.