"Castle Eden Fissure-fill Formation"@en . "Channelled erosional, unconformable contact with overlying limestone-rich gravel of the Limekiln Gill Gravel Formation or planar subhorizontal, unconformable contact with dark grey stony sandy silty clay diamicton of the Blackhall Till Formation."@en . . . . "stable"@en . . "CEDN"@en . "Up to 25 m."@en . . "Durham Fissure Fillings [Obsolete: use CEDN]"@en . . . "Castle Eden Fissure-fill Formation"@en . "Breccia formed of limestone and dolostone together with sparse clasts of red mudstone filling subvertical karstic fissures in the limestone and dolostones of the Zechstein Group (formerly Magnesian Limestone) (Francis, 1970). Two distinct units occur. The lower \"unfossiliferous fissure fills\" are likely to be either Mesozoic or early Palaeogene in age as they are similar to evaporite dissolution breccias that occur elsewhere within the Permian limestones. The upper \"fossiliferous fissure fills\" contain clay, in addition to limestone debris, that has yielded assemblages of partially pyritized organic material including peat, seeds, tree trunks, ostrocods, mammalian bones and freshwater molluscs. The remains of over 100 species of plant have been identified from lower parts. Of this \"Castle Eden Flora\" 64% of the species no longer grow in Britain, or are extinct. This flora suggests an Early Pleistocene age, which is supported by the identification of Mammuthus meridionalis, an elephant that was common in Europe in the Early Pleistocene up to the Cromerian. Sparse glacial erratics of supposed Scandinavian origin have been found in fissure fill deposits south of Limekiln Gill [NZ 4776 3813]."@en . "Unconformable contact with underlying fractured limestones and dolostones of the Zechstein Group (formerly Magnesian Limestone). The fissures are generally linear, vary from 1 to 7 m wide and extend down to 25 m vertically through the limestone cliffs from rockhead, locally along faults. Other fissure fills are cylindrical in shape. Fissure walls commonly bear subvertical slickensides resulting from compaction and many of the fragments are striated and polished."@en . "Blackhall Colliery Formation"@en . "251.9"^^ . "0.48"^^ . "Breccia. Stratified superficial deposits. Occurs onshore. Formed during the Mesozoic Era () - to - Cromerian Stage (Quaternary Period) (251.9-.48 Ma BP)."@en . .