 As might be expected, the markings above referred to, when in relief, occur on the under sides of the beds. A few instances may, however, be found where they exist on the upper surfaces. On careful consideration of these raised impressions, I have arrived...  Trace Fossils: Concepts, Problems, Prospects - Page 19edited by - 2011 - 632 pagesLimited preview - About this book
 | Geology - 1873 - 562 pages
...surfaces. On careful consideration of these raised impressions, I have arrived at the conclusion that they have been left by denudation of the surrounding material, just as footprints on dry snow sometimes remain in relief after the surrounding loose snow has been drifted away by the wind ; the... | |
 | Elkanah Billings, Bernard James Harrington, James Thomas Donald - Geology - 1875 - 498 pages
...surfaces. On careful consideration of these raised impressions, I have arrived at the conclusion that they have been left by denudation of the surrounding material, just as footprints on dry snow sometimes remain in relief after the surrounding loose snow has been drifted away by the wind; the... | |
 | Henry Alleyne Nicholson - Paleontology - 1879 - 540 pages
...occur on the upper surfaces of the strata. Such impressions, in the opinion of Principal Dawson, " have been left by denudation of the surrounding material, just as footprints on dry snow sometimes remain in relief after the surrounding loose snow has been drifted away by the wind, the... | |
 | Henry Alleyne Nicholson - Paleontology - 1879 - 542 pages
...occur on the upper surfaces of the strata. Such impressions, in the opinion of Principal Dawson, " have been left by denudation of the surrounding material, just as footprints on dry snow sometimes remain in relief after the surrounding loose snow has been drifted away by the wind, the... | |
 | Sir John William Dawson - Geology - 1888 - 370 pages
...forms in relief on the surfaces of rocks which are not Algae, but may be shallow burrows arched upward on top, or castings of worms thrown up upon the surface....pressure being better able to resist the denuding agency. The footprints from the Potsdam sandstone in Canada, for which the name Protichnites was proposed by... | |
 | Sir John William Dawson - Paleobotany - 1888 - 322 pages
...forms in relief on the surfaces of rocks which are not Algae, but may be shallow burrows arched upward on top, or castings of worms thrown up upon the surface. Sometimes, however, they may have beeu left by denudation of the surrounding material, just as footprints on dry snow remain in relief... | |
 | Science - 1873 - 1024 pages
...surfaces On careful consideration of these raised impressions, I have arrived at the conclusion that they have been left by denudation of the surrounding material, just as footprints on dry snow sometimes remain in relief after the surrounding loose snow has been drifted away by the wind ; the... | |
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