Deep circulation in the Late Cretaceous, oxygenisotope paleotemperatures from Inoceramus
remains in DSDS cores.
They consist of Krosno beds, Cergowa Sandstone, Inoceramus
beds and Variegated Shales (Burtan et al., 1992).
Invertebrate fossil remains from this section and nearby sections include the ammonite Pseudpulchelliaflexicostata (Imlay) and pelecypods Inoceramus
anglicus Woods and Arctica sp.?, as well as invertebrate traces such as Macaronichnus, Rosselia, Rhizocorallium, Gyrochorte, Planolites and possible Thalassinoides (LePain et al., 2008).
The Eze-Aku shale is dark-grey to black, calcareous, platy and thinly laminated with inoceramus
moulds between the laminae and alternates with marl units to form cyclotherms.
Ptychodus predation upon a Cretaceous Inoceramus
. Palaeont., 15:439-444.
Carbonate contents (mainly calcite) identified in this zone range from 20-30 %, which is a common value in the zone Xd ("resounding inoceramus
calcareous sandstones") in other places of the basin.
Eze-Aku shale is dark-grey to black, calcareous, platy and thinly laminated shale with Inoceramus
impressions between the laminae.