Search Results - "Craddock, R. A."

Global Spatial Distribution of Hack's Law Exponent on Mars Consistent With Early Arid Climate by Luo, W., Howard, A. D., Craddock, R. A., Oliveira, E. A., Pires, R. S.

“…Widespread valley networks (VNs) on Mars and other evidence point to an early warm and wet climate. However, ongoing debates still exist about VN's formation…”
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Characterization of fluvial activity in Parana Valles using different age-dating techniques by Bouley, S., Craddock, R.A., Mangold, N., Ansan, V.

“…Martian valley networks provide the best evidence that the climate on Mars was different in the past. Although these features are located primarily in heavily…”
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The case for rainfall on a warm, wet early Mars by Craddock, Robert A., Howard, Alan D.

“…Valley networks provide compelling evidence that past geologic processes on Mars were different than those seen today. The generally accepted paradigm is that…”
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Topographic data reveal a buried fluvial landscape in the Simpson Desert, Australia by Craddock, R. A., Hutchinson, M. F., Stein, J. A.

“…Buried river channels and valleys have proven to be valuable economic and agricultural resources. Often they are ecologically important refugia and in some…”
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Crater degradation in the Martian highlands: Morphometric analysis of the Sinus Sabaeus region and simulation modeling suggest fluvial processes by Forsberg‐Taylor, Nancy K., Howard, Alan D., Craddock, Robert A.

“…Results from simulation modeling of crater degradation by fluvial and eolian processes are compared with size‐frequency and depth of infilling statistics for…”
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A Large Paleolake Basin at the Head of Ma'adim Vallis, Mars by Irwin, Rossman P., Maxwell, Ted A., Howard, Alan D., Craddock, Robert A., Leverington, David W.

“…At 8 to 15 kilometers wide, Ma'adim Vallis is one of the largest valleys in the martian highlands. Although a groundwater source was previously suggested, the…”
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Crater morphometry and modification in the Sinus Sabaeus and Margaritifer Sinus regions of Mars by Craddock, Robert A., Maxwell, Ted A., Howard, Alan D.

“…Degraded craters in the southern highlands are indicative of an early martian climate much different than the present. Using a photoclinometric model, analyses…”
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Decline of crater obliteration rates during early martian history by Quantin-Nataf, C., Craddock, R.A., Dubuffet, F., Lozac'h, L., Martinot, M.

“…•We built a 1D model of crater obliteration.•We document the time-dependence of the crater obliteration rates on Mars continuously decreased between 3.8 Ga and…”
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Minimum estimates of the amount and timing of gases released into the martian atmosphere from volcanic eruptions by Craddock, Robert A., Greeley, Ronald

“…Volcanism has been a major process during most of the geologic history of Mars. Based on data collected from terrestrial basaltic eruptions, we assume that the…”
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Characterization of fluvial activity in Parana Valles using different age-dating techniques by Bouley, Sylvain, Craddock, R. A., Mangold, Nicolas, Ansan, V.

“…Martian valley networks provide the best evidence that the climate on Mars was different in the past. Although these features are located primarily in heavily…”
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An intense terminal epoch of widespread fluvial activity on early Mars: 2. Increased runoff and paleolake development by Irwin III, Rossman P., Howard, Alan D., Craddock, Robert A., Moore, Jeffrey M.

“…To explain the much higher denudation rates and valley network development on early Mars (>∼3.6 Gyr ago), most investigators have invoked either steady state…”
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The case for rainfall on a warm, wet early Mars by Craddock, R A, Howard, A D

“…Valley networks provide compelling evidence that past geologic processes on Mars were different than those seen today. The generally accepted paradigm is that…”
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Two tape-slide machines suitable for medical education by Craddock, R A

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Simulated degradation of lunar impact craters and a new method for age dating farside mare deposits : New views of the moon, Part 2 by CRADDOCK, R. A, HOWARD, A. D

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Standardizing the nomenclature of Martian impact crater ejecta morphologies by Barlow, Nadine G., Boyce, Joseph M., Costard, Francois M., Craddock, Robert A., Garvin, James B., Sakimoto, Susan E. H., Kuzmin, Ruslan O., Roddy, David J., Soderblom, Laurence A.

“…The Mars Crater Morphology Consortium recommends the use of a standardized nomenclature system when discussing Martian impact crater ejecta morphologies. The…”
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Simulated degradation of lunar impact craters and a new method for age dating farside mare deposits by Craddock, Robert A., Howard, Alan D.

“…With the advent of Clementine data it is now possible to determine the lithology and extent of geologic materials on the Moon, particularly the farside mare…”
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Geology of central Chryse Planitia and the Viking 1 landing site : Implications for the Mars Pathfinder mission: Mars Pathfinder mission and Ares Vallis Landing Site by CRADDOCK, R. A, CRUMPLER, L. S, AUBELE, J. C, ZIMBELMAN, J. R

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Key science questions from the second conference on early Mars: geologic, hydrologic, and climatic evolution and the implications for life by Beaty, David W, Clifford, Stephen M, Borg, Lars E, Catling, David C, Craddock, Robert A, Des Marais, David J, Farmer, Jack D, Frey, Herbert V, Haberle, Robert M, McKay, Christopher P, Newsom, Horton E, Parker, Timothy J, Segura, Teresa, Tanaka, Kenneth L

“…In October 2004, more than 130 terrestrial and planetary scientists met in Jackson Hole, WY, to discuss early Mars. The first billion years of martian geologic…”
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Geology of central Chryse Planitia and the Viking 1 landing site: Implications for the Mars Pathfinder mission by Craddock, Robert A., Crumpler, Larry S., Aubele, Jayne C., Zimbelman, James R.

“…1:500,000‐scale geologic mapping in the central Chryse Planitia region of Mars was correlated with “ground‐truth” data gathered by the Viking 1 lander…”
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Relation of therapeutic response to nifedipine to coronary anatomy and motion of S-T segment during unstable angina pectoris by Sellers, T D, Gibson, R S, Taylor, 4th, G J, Beller, G A, Martin, R P, McGuire, L B, Carabello, Jr, B A, Gascho, J A, Ayers, C R, DiMarco, J P, Beckwith, J R, Burwell, L R, Craddock, Jr, G A, Crampton, R S

“…Of 77 patients hospitalized for unstable angina pectoris and failure of oral, dermal, or intravenous nitrates and/or beta blockade, 81 percent with negligible…”
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