File:Portlock 1843 Geology Londonderry b30458250 Plate 29.jpg
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![File:Portlock 1843 Geology Londonderry b30458250 Plate 29.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/1/15/Portlock_1843_Geology_Londonderry_b30458250_Plate_29.jpg/400px-Portlock_1843_Geology_Londonderry_b30458250_Plate_29.jpg?20230708210145)
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