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    Manylion
    Delweddau
    Safleoedd Cysylltiedig
    Archifau Cysylltiedig
    NPRN261903
    Cyfeirnod MapSO00NW
    Cyfeirnod GridSO0426005360
    Awdurdod Unedol (Lleol)Merthyr Tudful
    Hen SirGlamorgan
    CymunedCyfarthfa
    Math O SafleLEFEL
    CyfnodÔl-Ganoloesol
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    Disgrifiad
    Collapsed linear channel extends W from tunnel portal as ground rises to W. Includes collapsed hollows & at least 2 shafts c.3m diam x 2.5m deep in woodland.