Geologic Map of the MTM-20272 and-25272 Quadrangles, Tyrrhena Terra Region of Mars

Scientific Investigations Map 2934
Prepared for the National Aeronautics and Space Administration
By:  and 



Introduction Mars Transverse Mercator (MTM) -20272 and -25272 quadrangles (lat 17.5?-27.5? S., long 270?-275? W.) cover part of the highlands of Tyrrhena Terra north of Hellas Planitia. The surface of the Tyrrhena Terra region records a complex history of impact cratering and modification by fluvial and eolian activity. The map area consists primarily of intercrater plains, impact crater material, and crater floor material. An extensive valley network, Vichada Valles, as well as several smaller networks, dissects the northern part of the map area. The abundance and widespread nature of fluvial features within the map area have significant implications for past Martian environmental conditions. The degraded terrains surrounding Hellas Planitia provide constraints on the role and timing of volatile-driven activity in the evolution of the highlands. The geologic history of this area may have been influenced not only by the presence of Hellas Planitia but also by other buried impact basins.
Publication type Report
Publication Subtype USGS Numbered Series
Title Geologic Map of the MTM-20272 and-25272 Quadrangles, Tyrrhena Terra Region of Mars
Series title Scientific Investigations Map
Series number 2934
ISBN 1411310624
DOI 10.3133/sim2934
Edition Version 1.0
Year Published 2006
Language ENGLISH
Contributing office(s) Astrogeology Science Center
Description map (41x37 in); pamphlet 15 p.
Projection Mars Transverse Mercator
Scale 1004000
Google Analytic Metrics Metrics page
Additional publication details