NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The intercrater plains of Mercury and the Moon: Their nature, origin and role in terrestrial planet evolution. Constuction of the paleogeologic mapsThe Post Caoris surface was derived from the geologic map by plotting all Class 1 and 2 features. To construct the Caloris surface, Class 3 craters were plotted onto the map, as well as all Class 3 plains. However, if P3 plains were adjacent to P2 units, and appeared continuous with other exposures of P3 material, the P2 unit was assumed to overlie the C3 and P3 material. The younger superposed craters were ignored with respect to the Class 3 surface. The boundaries of P3 materials were then continued under the superposed units, using a minimum of reasonable assumptions. For instance, if P2 and P4 plains were adjacent units, no P3 plains were presumed to lie under the P2 material. Similarly, all C3 craters were considered to have some deposits of impact melt after formation, even if they are mapped containing younger units. C3 craters which were superposed with younger units, C1 or C2 craters, and perhaps P2 plains, were redrawn as if later materials had not been emplaced, i.e., in their post impact, pre-degradation states.
Document ID
19830003749
Document Type
Thesis/Dissertation
Authors
Leake, M. A.
(Arizona Univ. Tucson, AZ, United States)
Date Acquired
August 11, 2013
Publication Date
September 1, 1982
Publication Information
Publication: NASA, Washinghton Advan. in Planetary Geol.
Subject Category
Lunar And Planetary Exploration
Funding Number(s)
CONTRACT_GRANT: NSG-7146
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle19830003736Analytic PrimaryAdvances in Planetary Geology
No Preview Available