Belemnella (Pachybelemnella) obtusa Zone
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Base: The base of the zone is defined by the first appearance of the index species (Schulz, 1979).
Range of the index species: The range of the index species is co-extensive with the nominate zone (Schulz, 1979). In the Kronsmoor - Hemmoor sections, the index species is abundant, and co-occurs with Belemnella (B.) lanceolata (at the base) and sporadic B. (B.) longissima (Schulz, 1979).
Biostratigraphical correlation: The zone equates with most of the upper part of the B. lanceolata Zone s.l. of the standard macrofossil zonal scheme.
Lithostratigraphical correlation: The zone equates with the upper part of the Sidestrand Chalk Member and the Trimmingham Sponge Beds Member (Johansen & Surlyk, 1990).