Holden NE crater Main Goals: Discriminate between Lacustrine Delta/Alluvial Fan hypotheses Analysis of the complex stratigraphy within the fan Look for evidence for/against persistent flow

Holden Layers Roughly 150 meters of layered deposits within the Holden fan Stereo data shows distinct layers clearly Profiles can be extracted along continuous outcrops of a single layer

Holden NE Layer Profiles Current focus: determining strike and dip of layers, with the goal of examining structure perpendicular to channels

Meridiani Circular Feature Main goals: Determine Formation Process Investigate regional stratigraphy

Geologic Map of Meridiani Hematite Unit Etched Terrain Region of Interest Region of interest is a small part of the geology of Meridiani Units in the region of interest lie stratigraphically below hematite unit

Region of Interest Layered Blanket Dozens of layers Linear features 1 km

Meridiani DEM 4 stereo DEMs were produced of the circular feature All DEMs had good correlation, but all had some degree of ‘jitter’

Stereo vs. MOLA Top – Stereo derived, gridded DEM profile Bottom – MOLA gridded DEM profile Both profiles show a fold in the topography Circular feature tilted to the north Depression has anomalously low depth/diameter ratio

Geologic Model Stratigraphy in this area is more complex than expected This may be a clue to the depositional history of these units

Formation Hypotheses 1) Crater with sedimentary deposits 2) Crater with Fluidized Ejecta 3) Circular Anticline (dome)

Radial Profile