Specimen from borehole Telatyn IG-1 (depth 1022 m), Namurian A (level Posidonia corrugata I)

Diagnoza

Shell with a narrow umbilicus, do not showing the preceding whorls; delicate, transverse ribs, slightly convex towards the front, bifurcating a short distance from the umbilicus, fine concentric striation.

Porównanie

Intermediate form between Cravenoceras nitidum and C. stellarum, as well as C. fragile and Nuculoceras nuculum, by the fineness of the radial striation and by the weak opening of its umbilicus; similar to  N. nuculum in concentric striation, which is manifested by crenulations on the radial ribs in quite a number of specimens, but differs in the lack of any spiral ornament.

Autekologia

Występowanie geograficzne

Great Britain (Yorkshire), Ireland (Slieve Anierin), Belgium (Namur), Germany (Rhenish Slate Mts.), Czechia (Ostrava), Poland (Lublin Area, Upper Silesia), USA (California). 

Zasięg czasowy

Carboniferous, Bashkirian (Namurian, Gaebler marine horizon; above C. edalensis) 

Materiały muzealne

Literatura

Bojkowski, K. 1979. Gonatyty z karbonu Górnośląskiego i Lubelskiego Zagłębia Węglowego.  Biuletyn Instytutu Geologicznego 311: 5-68.

Korejwo, K. 1969. Stratigraphy and palaeogeography of the Namurian in the Polish Lowland. Acta Geologica Polonica 19 (4): 609-70.

Musiał, Ł. & Tabor, M. 1988. Stratygrafia karbonu na podstawie makrofauny. In. Z. Dembowski & J. Porzycki (eds.), Karbon Lubelskiego Zagłębia Węglowego. Prace Instytutu Geologicznego 122: 88-111.

Vasicek, Z. 1983. Beitrag zu den juvenilen Goniatiten des marinen Gaebler-Horizonts (Tschechoslowakischer teil des Oberschlesischen beckens, Namur A). Časopis Moravského muzea 67: 29-56.