Bulletin of the Geological Society of America . ^ch (5l~ Figure 9.—Phacoidal Structure (on left) and Boudins hounded hy schistose Rock (on right) The phacoidal structure is due to rupture of competent layers and abrasion of piecesby flow of schistose matrix. The boudins bounded by schistose rock are not broken norrounded by movement of the matrix. result in thickening and uplift, and this uplift may approximate in shapethat of a great boudin. Lohest maintains that the whole uplifted areaof Bastogne is a giant boudin. If so, boudinage may offer an explanationof how some folds die out in de
Bulletin of the Geological Society of America . ^ch (5l~ Figure 9.—Phacoidal Structure (on left) and Boudins hounded hy schistose Rock (on right) The phacoidal structure is due to rupture of competent layers and abrasion of piecesby flow of schistose matrix. The boudins bounded by schistose rock are not broken norrounded by movement of the matrix. result in thickening and uplift, and this uplift may approximate in shapethat of a great boudin. Lohest maintains that the whole uplifted areaof Bastogne is a giant boudin. If so, boudinage may offer an explanationof how some folds die out in depth, and how folds which increase in sizewith depth may pass out of existence at greater depth. In every case theboudins are separated from the overlying and underlying incompetent PECULIARITIES OF BOUDINAGE 659 material by shear zones. Similarly, a giant bondin may come to an endat considerable depth in contact with the deep zone of flow. If the central part of the boiidins is not compressed as much as theouter arched beds, it is difficult
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
