Turbonitella sp.
PI. 15 figs 1-2
Description. Shell very small, turbiniform, anomphalous. Protoconch of about 11A smooth whorls, apex bulbous. Teleoconch of about 21h whorls; shell profile strong convex, suture shallow, whorl embracing much of previous whorl, a row of nodes between suture and collar-like adpressed zone, continues to a row of collabrally lengthened pustules at upper face of whorl. Aperture convex, lenticular in shape, columellar and inner lips thickened with strongly excavated, outer lip thin.
| Dimensions. Figured specimens | H | W | PA | NW |
|---|---|---|---|---|
| (F78466) 5.0 mm (F78465)2.6 | 3.7 mm 2.3 | 90° 95 | 5 31h | |
Stratigraphic position. In bioclastic limestone, 130 m above the base of the Namoi Formation.
Material. 7 specimens from south-east of 'Rangari' (Locality 18), 3 from Swains Gully (Locality 25), 2 from 'Marohn' (Locality 28) and 1 from Glenbawn (Locality 29).
Geographic distribution. 'Rangari' to Glenbawn.
Geological age. Middle to late Tournaisian.
Remarks. The figured specimens resemble the holotype Turbonitella biserialis(Phillips) designated by Knight (1941) in being a turbiniform with strong collabral ribs on shoulder, but differs in lacking a row of ribs on the lower whorl face.