  We report on observations made of the ~36km diameter crater, Louth, in the
north polar region of Mars (at 70{\deg}N, 103.2{\deg}E). High-resolution
imagery from the instruments on the Mars Reconnaissance Orbiter (MRO)
spacecraft has been used to map a 15km diameter water ice deposit in the center
of the crater. The water ice mound has surface features that include roughened
ice textures and layering similar to that found in the North Polar Layered
Deposits. Features we interpret as sastrugi and sand dunes show consistent wind
patterns within Louth over recent time. CRISM spectra of the ice mound were
modeled to derive quantitative estimates of water ice and contaminant
abundance, and associated ice grain size information. These morphologic and
spectral results are used to propose a stratigraphy for this deposit and
adjoining sand dunes. Our results suggest the edge of the water ice mound is
currently in retreat.
