| 单词 | ripple mark |
| 例句 | Ripples are known by several names: ripple marks, ripple cross-beds, or ripple cross laminations. An Introduction to Geology 2017-01-01T00:00:00Z The retained pieces are of interest, for on their inner surfaces they are covered with a large number of small patches of very fine ripple marks. From the archive 2019-02-11T05:00:00Z These worm borings, like the ripple marks, show that the sand was once loose. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z The rocks show ripple marks which were made by waves when the rock material was soft sand and mud. Glacier National Park [Montana] 2011-06-21T02:00:29.217Z So eternity swallows us and leaves no trace behind, and no ripple marks its surface. Cape Cod Folks Tidal flat deposits typically contain gradational sediments and may include multi-directional ripple marks. An Introduction to Geology 2017-01-01T00:00:00Z The sands of West Sussex are wide and free, firm and smooth for walking with bare feet, lovely with little shells and sea-worm curves and ripple marks and the pits of razor-shells. The Healthy Life, Vol. V, Nos. 24-28 The Independent Health Magazine These ripple marks on the surfaces of the sandstone layers must have originated while the sand was movable, and therefore before it was cemented into sandstone. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z Sand, sleeping in; to pitch tents or picket horses in; ripple marks on, give sign of direction; used in raising a sarcophagus. The Art of Travel Shifts and Contrivances Available in Wild Countries The rock in the hills seemed calcarious, and on a detached slab of ferruginous sandstone, I saw a more perfect specimen of ripple marks than I had ever seen elsewhere, except on the sea-beach. Journal of an Expedition into the Interior of Tropical Australia Combinations of symmetrical ripple marks, asymmetrical ripple marks from tidal currents, and mud cracks from drying form on these flats. An Introduction to Geology 2017-01-01T00:00:00Z The pulse of waves and tidal currents agitates the loose material of offshore deposits, throwing it into fine parallel ridges called ripple marks. The Elements of Geology At some points the surfaces of the layers carry ripple marks, and where they are present, they serve as a ready means of identifying the bedding planes, even though the strata are now on edge. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z Snow, bivouac on; huts of; hearth on; filter for muddy water; snow does not satisfy thirst; blindness and spectacles; drifts to cross; ripple marks to steer by; snowy mountains, to climb. The Art of Travel Shifts and Contrivances Available in Wild Countries Frequent ripple marks on the bedding planes of the strata prove that the loose sands of the sea floor were near enough to the surface to be agitated by waves and tidal currents. The Elements of Geology |
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