Item talk:Q248159

From geokb

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   "name": "Evaluating the meaning of \u201clayer\u201d in the Martian north polar layered deposits and the impact on the climate connection",
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   "abstract": "Using data from the High Resolution Imaging Science Experiment (HiRISE) aboard the Mars Reconnaissance Orbiter, we reassess the methods by which layers within the north polar layered deposits (NPLD) can be delineated and their thicknesses measured. Apparent brightness and morphology alone are insufficient for this task; high resolution topographic data are necessary. From these analyses, we find that the visible appearance of layers depends to a large degree on the distribution of younger, mantling deposits (which in turn is partially influenced by inherent layer properties) and on the shape and location of the particular\u00a0outcrop. This younger\u00a0mantle\u00a0partially obscures layer morphology and brightness and is likely a cause of the gradational\u00a0contacts\u00a0between individual layers at this scale. High resolution images reveal that there are several layers similar in appearance to the well-known\u00a0marker bed\u00a0discovered by Malin, M., Edgett, K., 2001. J. Geophys. Res. 106, 23429\u201323570. The morphology, thicknesses\u00a0(4-8\u00b12m), and separation distances\u00a0(5-32\u00b12m)\u00a0of these marker beds, as gleaned from a high resolution stereo\u00a0digital elevation model, lend insight into the connection between stratigraphy and climate.",
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