Grey to brownish limestone or dolomite; some anhydrite may be present in the unit. On wireline logs it often shows a blocky appearance. Some claystone beds occur in the unit. On the Peel Block, in adjacent parts of Germany and possibly elsewhere small bryozoan build ups have been encountered on structural highs (Geluk, 2000, 2007; Geluk & Röhling 2016).
Shallow marine, carbonate slope.
Not yet determined.
The Z1 Fringe Carbonate Member is overlain by either the Z1 Middle Claystone or the Z1 Fringe Sandstone members.