File:Bulletin 426 Plate II B Quarries near Glen Echo.jpg
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[edit]DescriptionBulletin 426 Plate II B Quarries near Glen Echo.jpg |
English: Plate II B, original caption: "Granite quarry near Glen Echo, Maryland, showing intersecting joints." Photo c. 1910. Text from the volume describing this figure: Jointing, both vertical and horizontal, is prominently developed in the Maryland granites (see Pl. II, A, B), and a third set of diagonal joints is distinct in many of the quarries. |
Date | |
Source | Granites of the Southeastern Atlantic States, Bulletin 426, United States Geological Survey, Government Printing Office, Washington, 1910. |
Author | Watson, Thomas Leonard |
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