Figure 12.

Silica‐bearing material overlying the crater floor fractured unit. (a) THEMIS thermal inertia map from Edwards and Buz (2021) covering region of interest. The area of interest (within the black outline) has moderate thermal inertia. (b) CRISM pixels for the spectra in panel (e) shown in orange. (c) Enlarged view of dark‐toned unconsolidated material overlying crater floor fractured unit bedrock, outside of the area mapped by Stack et al. (2020). (d) Same image as (c), but with crater floor fractured unit bedrock mapped in yellow. Most of the area covered by the CRISM pixels shown in panel (a) is comprised of dark‐toned unconsolidated material. (e) UMass, TRR3, And TER CRISM spectra (orange) of pixels shown in panel (a) compared to library spectra (black). The broad 2.2 μm feature is consistent with the presence of hydrated silica, which was also reported in smooth dark‐toned material in Jezero crater by Tarnas et al. (2019). The additional 2.3 μm absorption that merges with the 2.2 μm features is consistent with the presence of phyllosilicate‐bearing material. The geologic context, visible properties, and spectra of this outcrop are consistent with hydrated silica‐bearing dark‐toned unconsolidated material overlying phyllosilicate‐bearing crater floor fractured unit bedrock.