Specimen from Świdnik blocks, borehole M3 (depth 1051-1057 m)

Diagnoza

Shell with flanks adorned with inconspicuous transverse striae, showing a rounded central lingua with a large radius near the umbilicus and a narrower outer lingua at the outer third near the ventral edge; suture in ventral lobe, wide, complicated by a median saddle rising halfway up the lobe and dividing it into two parts each comprising two subsidiary saddles, one of which, closest to the median saddle, more stronger than the other; the latter barely visible in young individuals; first lateral saddle, very high, rounded at its top, with seemingly smooth edges, the outer edge being wavy towards the base; lateral lobe variable with age; second lateral saddle, wide and low.

Porównanie

Autekologia

Występowanie geograficzne

Czechia (Opatovice), Great Britain (Yorkshire), Belgium (Namur, Hainaut, Liège) and Poland (Lublin Coal Basin).

Zasięg czasowy

Carboniferous, Bashkirian (Namurian)

Materiały muzealne

Literatura

Frech, F. 1899. Lethaea geognostica oder Beschreibung und Abbildung der für die Gebirgs-Formationen bezeichnendsten Versteinerungen. I. Theil. Lethaea palaeozoica. 2. Band. Stuttgart.

Korejwo, K. 1986. Biostratigraphy of the Carboniferous deposits of the Swidnik blocks (Lublin Coal Basin). Acta Geologica Polonica 36 (4): 337-346.

Nikolaeva, S.V. 2008. The Carboniferous Ammonoids from the Gilbertson Collection described by John Phillips. Palaeontographical Society Monograph 626, issued as part of v. 160 for 2006, 1-70, 40 fig., 17 pl., London

Phillips, J. 1836. Illustrations of the geology of Yorkshire, part II. The Mountain Limestone District., 259 pp.; London.