Toweius brusselensis Steurbaut, 2011

Steurbaut, Etienne & Nolf, Dirk, 2021, The Mont-des-Récollets section (N France): a key site for the Ypresian-Lutetian transition at mid-latitudes - reassessment of the boundary criterion for the base- Lutetian GSSP, Geodiversitas 43 (11), pp. 311-363 : 348

Toweius brusselensis Steurbaut, 2011

( Fig. 19 K-N)

Toweius brusselensis Steurbaut, 2011 : figs 15-16; pl. 1, figs 20-22.

DISTRIBUTION. — This species is known from several boreholes (e.g. Knokke, Vlakte van de Raan) and outcrops (e.g. Gobertange, Nederokkerzeel, Vossem) in Belgium, where it ranges from the middle of the Brussel Sand Formation (middle part of Unit B3) up to the basal part of the overlying Lede Sand Formation. In Belgium its range seems to extend from lower middle NP14 to the base of NP15. Some rare small-sized specimens have been identified in the ‘Chaumont-en-Vexin sands‘ and the ‘Glauconie Grossière s.s.’ of the Paris Basin (base NP14). Occurrences outside Europe are scarce and up to now restricted to the Aktulagay section in Kazakhstan (a few specimens in uppermost NP13, Steurbaut 2011).

DISCUSSION

This taxon is represented by relatively small forms (d = c. 5 µm) in the early part of its range (e.g. middle of Unit B 3 at Vossem; Fig. 19M, N ). Late forms from the upper part of the Brussel Sand Formation reach up to 8 µm in length ( Fig. 19K ).

Figures

FIG. 19. — New or less known calcareous nannofossil taxa from the Eocene of the Mont-des-Récollets and other localities in Belgium. Pars 2: A, Nannoturba jolotteana Steurbaut, 2011, Mont-des-Récollets, 104.35 m, d = 15.2 µm (IRSNB b7120); B, C, Luminocanthus eolutetiensis n. gen., n. sp.; B, Vlakte van de Raan BH, 81.45 m depth, holotype, d = 9 µm (IRSNB b7121); C, Vlakte van de Raan BH, 79.95 m depth, paratype, d = 9 µm (IRSNB b7122); D-F, Nannoturba joceliniae n. sp., Mont-des-Récollets; D, 122.85 m, holotype, wm = 17 µm (IRSNB b7123); E, 123.50 m, paratype, wm = 13 µm (IRSNB b7124); F, 122.85 m, paratype, wm = 13 µm (IRSNB b7125); G-J, Luminocanthus plenilutetiensis n. gen., n. sp.; G, Mont-des-Récollets, 122.26-122.21 m, holotype, d = 8.4 µm (IRSNB b7126);H, Vossem, otolith sample Nolf 1974, paratype, d = 5.2 µm (IRSNB b7127); I, Prémontré, sample 12, paratype, d = 9.6 µm (IRSNB b7128); J, Knokke BH, 71.95 m depth, paratype, d = 6.7 µm (IRSNB b7129); K-N, Toweius brusselensis Steurbaut, 2011; K, Knokke BH, 97.50 m, paratype, d = 8.4 µm (IRSNB b6403); L, Mont-des-Récollets 122.85 m, l = 6 µm (IRSNB b7130); M, N, Vossem,otolith sample Nolf 1974, l = 4.6 µm (IRSNB b7131, b7132); O, Cribrocentrum sp. Isnes, sample 8, l = 5.9 µm (IRSNB b7133); P, Sphenolithus spiniger Bukry, 1971, Vossem,otolith sample Nolf 1974, h = 6.2 µm (IRSNB b7134); Q, Sphenolithus radians Deflandre in Grassé, 1952, Vossem, otolith sample Nolf 1974, h = 4.2 µm (IRSNB b7135); R, Sphenolithus moriformis (Bronnimann & Stradner, 1960), Vossem, otolith sample Nolf 1974, h = 3.3 µm (IRSNB b7136); S-V, Pemma spp.; S, Mont-des-Récollets, 115.50 m, d = 9 µm (IRSNB b7137); T-V, Vossem, otolith sample Nolf 1974 (IRSNB b7138, b7139, b7140); T, d = 8.3 µm; U, d = 8.4 µm; V, d = 6.5 µm.