The rocks include grey to black organic-rich shale,
mudrock, oil shale, siltstone, and sandstone with thin carbonate and rare evaporite.
The onset of grey
mudrock and sandstone in the Joggins Formation provides a secondary criterion in mapping incompletely exposed sections.
Tevissen, "Cesium sorption and diffusion in Bure
mudrock samples," Applied Clay Science, vol.
Subsequent deposits are 20 m of basalt with a weathered top surface overlain by red and green
mudrock which incorporates balls of weathered alveolar basalt (Fig.
Middle Ordovician sandstone and
mudrock of the Mictaw Group were first deformed by the Middle Ordovician Taconian Orogeny, which for most authors includes the Late Cambrian to Early Ordovician Gaspesian deformation as an early phase (Rodgers 1967; St-Julien and Hubert 1975; de Broucker 1987).
The upper part of the Port Hood Formation is represented by coal measures comprising grey
mudrock interbedded with sandstone, with minor red siltstone and shale.
demonstrated that the successful use of the NMR to obtain pore size distribution of
mudrock and fine-grained sandstone samples [37].
Pore water chemistry of a Paleogene continental
mudrock in Spain and a Jurassic marine
mudrock in Switzerland: Sampling methods and geochemical interpretation
The Middle Cambrian includes the Shayilike and Arwatage formations; they are characterized by variable stromatolites and reddish dolomitic
mudrock (or argillaceous dolomite) intercalated with subordinate evaporites.
Pearson, "What is the porosity of a
mudrock?" Geological Society, London, Special Publications, vol.
Spectrum of pore types and networks in
mudrocks and a descriptive classification for matrix-related
mudrock pores.
'The mineralogical associations we identified mean that for a given Cambrian sedimentary
mudrock we can predict with around 80% accuracy whether it is likely to contain Burgess Shale-type fossils,' explains Anderson.