New Evidence of Intra-Formational Piping at Two Separate Horizons in the Carboniferous Limestone (Dibunophyllum Zone) at South Cornelly, Glamorgan

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Abstract
Large-scale extractions from a limestone quarry immediately east of the village of South Cornelly have provided sections of the Dibunophyllum Zone (probably the top of D1 Subzone) showing deep piping at two separate horizons. On the lower sides and floors of some of the larger pipes, the limestones and pseudo-breccias have been metasomatically replaced by a thin layer or by irregular pockets of haematite up to a foot in thickness. All the evidence points to two periods of emergence and sub-aerial erosion followed by lagoonal conditions with a Keuper-like environment when the irregularities of the underlying rock surface were filled with marl.