File:Portlock 1843 Geology Londonderry b30458250 Plate 06.jpg
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![File:Portlock 1843 Geology Londonderry b30458250 Plate 06.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/08/Portlock_1843_Geology_Londonderry_b30458250_Plate_06.jpg/400px-Portlock_1843_Geology_Londonderry_b30458250_Plate_06.jpg?20230708210123)
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