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The lower one, K4a, is very shaly, K4b is mainly halite, and K4c is mostly anhydritic, with halite only as thin beds.
This unit clearly is more homogeneous than the precedent K4b and can be easily differentiated, both on well logs and outcrop.
In the medium part, K4b, the evaporitic sequences are fully developed and reach the halite stage, maximum brine concentration of the K4-K6 sequence.
Extensive intra- and interindividual heterogeneity of p15'"K4B methylation in acute myeloid leukemia.
Elf Petroland, Elf Aquitaine's Dutch subsidiary, has confirmed the discovery of three North Sea gas deposits on blocks K4a, K4b and F15a.
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