dolomitised BrE
dolomitized AmE

Hosted in Lower Carboniferous rocks, they occur at the junction of an argillaceous bioclastic limestone (below) and the dolomitised Waulsortian limestone above.

Here, it is made up of light-coloured and dolomitised carbonate mudstones, interbedded with thin layers of laminated stromatolites (Clark and Tallbacka 1980).

Generally, the lower unit of the Z3 Carbonate consists of tight, dolomitised carbonate mudstones with porosities and permeabilities rarely exceeding 3% and 3 mD, respectively (Fig. 28).

The reefs are characterised by an upper unit of dolomitised and vuggy bioclastic and pellotoidal packstones and a lower unit of dolomitised carbonate mudstones.

On the interior parts of the platform, the succession is composed predominantly of cyclic alternations of dolomitised carbonate mudstones and algal boundstones, interbedded with thin layers of nodular anhydrite (Fig. 28).

Deep tests south of the Brabant Massif in France and Belgium have encountered porous conditions in dolomitised Frasnian stromatoporoid /coral reefs, and in fissured Dinantian dolomites (Massa and Oudin 1980).