Table 2.5 (continued)
Region
Rough.
index
Characteristics and area [km
2
]
Imhotep
(Im)
15.14
Smooth “dusty” depression
surrounded by more consolidated
material. Circular features at the
edges of the smooth terrain
4.90446
Sub-region a
Smooth material at the centre of
the region. Observed to change
dramatically over the mission.
Bounded by Ash to the north. On
two sides there are steps upwards
to rougher terrain (sub-region b)
while on the remaining side there
are layers downwards to
sub-region c with a more gradual
transition than elsewhere.
Sub-region b
Rim of sub-region a. Contains
layered terrain incorporating a
large circular structure.
Sub-region c
Rougher terrain inside the rim of
Imhotep. Includes all the small
quasi-circular structures. Adjoins
the smooth terrain. At the boundary there are indications of
layering.
Sub-region d
Clearly rocky at its edge but covered with smooth material in
depressions. Evidence of surface
changes in places similar to those
observed in sub-region
a. Boundary to smooth surface
(sub-region a) often associated
with a clear scarp. Similar to
Khepry although topographically
lower.
Anubis
(Ab)
11.63
Smooth surface probably not consolidated and has undergone surface
modification possibly similar to that
observed in Imhotep.
0.92241
Bes (Be)
17.15
Multiply-layered terrain bordering
the scarp into the southern part of
the neck.
2.42084
Sub-region a
Topographically lowest level.
Covered in boulders in some
places.
Sub-region b
Separated from a by a cliff. Contains a diamond-shaped structure
surrounding a surface with large
boulders
(continued)
2.9 Surface Processes
87