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Browsing by Author "Howard, Alan D."
Now showing items 1-20 of 21
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Craddock, Robert A.; Bandeira, Lourenço; Howard, Alan D. (2018)Impact craters on Mars have been extensively modified by ancient geologic processes that may have included rainfall and surface runoff, snow and ice, denudation by lava flows, burial by aeolian material, or others. Many ...
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Wilson, Sharon A.; Howard, Alan D.; Moore, Jeffrey M.; Grant, John A. (2016)
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Constraints on the Noachian paleoclimate of the martian highlands from landscape evolution modeling Matsubara, Yo; Howard, Alan D.; Irwin, Rossman P., III (2018)The progressive degradation and loss of impact craters throughout the Noachian Period on Mars indicate prolonged erosion, rather than a brief spike around the Noachian/Hesperian transition. The purpose of this study is to ...
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Craddock, Robert A.; Maxwell, Ted A.; Howard, Alan D. (1997)Degraded craters in the southern highlands are indicative of an early martian climate much different than the present. Using a photoclinometric model, analyses of degraded crater morphometry have revealed the stages of ...
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Craddock, Robert A.; Maxwell, Ted A.; Howard, Alan D. (1997)
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Matsubara, Yo; Howard, Alan D.; Irwin, Rossman P., III (Smithsonian National Air and Space Museum - Center for Earth and Planetary Studies, 2018)This data repository includes the Fortran source files for landscape evolution modeling, initial conditions digital elevation models (DEMs), example model result DEMs, image mosaics, and topographic DEMs for two study areas ...
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Craddock, Robert A.; Howard, Alan D.; Irwin, Rossman P., III; Tooth, Stephen; Williams, Rebecca M. E.; Chu, Pao-Shin (2012)
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Burr, Devon M.; Perron, J. T.; Lamb, Michael P.; Irwin, Rossman P., III; Collins, Geoffrey C.; Howard, Alan D.; Sklar, Leonard S.; Moore, Jeffrey M.; Adamkovics, Mate; Baker, Victor R.; Drummond, Sarah, A.; Black, Benjamin A. (2013)
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Morgan, Alexander M.; Purdy, Sharon A.; Howard, Alan D. (National Air and Space Museum, 2022)This is a global dataset of fan-shaped sedimentary landforms on Mars.
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Morgan, Alexander M.; Wilson, Sharon A.; Howard, Alan D. (2022)
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Wilson, Sharon A.; Morgan, Alexander M.; Howard, Alan D.; Grant, John A. (2021)We present an inventory of alluvial fans and deltas within martian impact craters based on a systematic global survey of Context Camera images. Our database includes 314 fan-hosting craters, with a total of 890 alluvial ...
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Purdy, Sharon A.; Morgan, Alexander M.; Grant, John A.; Howard, Alan D. (The Smithsonian Institution, 2020)Dataset ds01 is a delimited text file with the results of our global inventory of craters with alluvial fans and putative deltas (scarp-fronted fans). The dataset contains the following fields from this study along with ...
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Grant, John A.; Wilson, Sharon A.; Dobrea, Eldar Noe; Fergason, Robin L.; Griffes, Jennifer L.; Moore, Jeffery M.; Howard, Alan D. (2010)HiRISE images together with other recent orbital data from Mars define new characteristics of enigmatic Hesperian-aged deposits in Sirenum Fossae that are mostly 100-200 m thick, drape kilometers of relief, and often display ...
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Williams, Rebecca M. E.; Irwin,Rossman P., III; Dobrea, Eldar Z. Noe; Howard, Alan D.; Dietrich, William E.; Cawley, J. C. (2021)In deserts, the interplay between occasional fluvial events and persistent aeolian erosion can form composite modern and relict surfaces, especially on the distal portion of alluvial fans. There, relief inversion of alluvial ...
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Matsubara, Yo; Howard, Alan D. (2014)
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Wilson, Sharon A.; Grant, John A.; Howard, Alan D.; Buczkowski, Deborah L. (2018)
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Irwin, Rossman P., III; Tooth, Stephen; Craddock, Robert A.; Howard, Alan D.; de Latour, Ana Baptista (2014)
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Irwin, Rossman P., III; Lewis, Kevin W.; Howard, Alan D.; Grant, John A. (2015)Eberswalde crater, Mars, contains a well-preserved fluvial distributary network in a likely deltaic setting. The meandering inverted paleochannels and closed drainage basin of this deposit support relatively well constrained ...
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Burr, Devon M.; Enga, Marie-Therese; Williams, Rebecca M. E.; Zimbelman, James R.; Howard, Alan D.; Brennand, Tracy A. (2009)A survey of THEMIS visible wavelength images in the Aeolis/Zephyria Plana region over the two western lobes of the equatorial Medusae Fossae Formation (MFF) shows ~150 sinuous ridges having a variety of morphologies and ...
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Matsubara, Yo; Howard, Alan D.; Burr, Devon M.; Williams, Rebecca M. E.; Dietrich, William E.; Moore, Jeffery M. (2015)The paleo-meanders in the Aeolis Dorsa (AD) region show that meandering channels can develop in the absence of vegetation. Three possible mechanisms other than vegetation could contribute to the bank cohesion required to ...
Now showing items 1-20 of 21
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