File:Portlock 1843 Geology Londonderry b30458250 Plate 22A.jpg
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![File:Portlock 1843 Geology Londonderry b30458250 Plate 22A.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Portlock_1843_Geology_Londonderry_b30458250_Plate_22A.jpg/400px-Portlock_1843_Geology_Londonderry_b30458250_Plate_22A.jpg?20230708210137)
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