Transcript Document 35033

Eroded Crater at Mawrth: at
least 2 generations of fill.
Latitude/longitude:
24° 2'20"N, 18°56'20"W
(previously proposed but with
different rationale)
Rationale:
Evaluation of layering in bedrock vs
layering due to erosion of recent crater
fill
Morphology and Mineralogy:
Bench in a crater and discontinuous
dark bands in crater wall. Within
Fe/Mg-smectite unit, with mafic dunes
and recent crater fill.
What will the rover specifically do?
Evaluate the structure of bedrock,
specifically whether bedding or
fracturing creates roughly horizontal
bands in the crater wall. Also evaluate
the origin of the topographic bench in
the crater wall.
Next
slide
From HiRISE image
ESP_011884_2045 draped on a
HiRISE-derived DTM with 5 m
contour interval show in yellow.
The width of the yellow contours
is inversely proportional to local
slope. A nearly continuous
bench in a small crater cuts
rapidly up the crater wall to the
west (mapped in red). The
current fill level of the crater is
similarly slopes (mapped in
green dashes). The interaction
of the bench with topography
would define apparent dips if the
bench represented a layer; all
apparent dips project inward into
the crater (white dip symbols).
The slope of the crater
substantially decreases above
this bench on the east and
northeast sides. These
relationships suggest that the
bench may represent a paleofill
level for the crater.
20 m
All images show the same area from HiRISE image
ESP_011884_2045, which is draped on a HiRISEderived DTM for images on the right, with 5 m contour
interval show in yellow in B. The width of the yellow
contours is inversely proportional to local slope. The star
marks the same place in A and B. A) Sparse layering is
present in the upper wall of the crater (mapped in red),
but the layers are not laterally continuous. B) Same area
as A, viewed obliquely. “Layers” do not project through
topography, and separately mapped features can not
represent through- going planes.