Sedimentary structures associated with the fossils include asymmetrical current ripples, raindrop imprints, desiccation cracks, and gas-escape structures.
Associated sedimentary structures include oscillation ripple marks, raindrop imprints, gas-escape structures and desiccation cracks.
The position of the paleo-shoreline was identified by the appearance of desiccation cracks in the lower Terrill Member.
The presence of desiccation cracks marks the position of the paleo-shoreline, and algal fossils and microendoliths constrain the depth ranges for more downramp deposits.
White EM (1970) Giant desiccation cracks
in Central South-Dakota soils.
Washington, September 16 (ANI): Networks of giant polygonal troughs etched across crater basins on Mars have been identified as desiccation cracks
caused by evaporating lakes, providing further evidence of a warmer, wetter Martian past.
The Rabejac Fm consists of coarse alluvial fan deposits in the western border, passing toward the basin to red sandstones and mudstones with abundant sedimentary structures (ripple marks, desiccation cracks
, footprints and invertebrates tracks), indicating long subaerial exposure.
Water migrated from as much as 50 cm (20 inches) below the freezing front toward the thin ice lenses; vertical desiccation cracks
formed below the freezing front.
The latest round of photos were the first images and evidence of actual mud cracks or desiccation cracks
Furthermore, the presence of asymmetric ripples, desiccation cracks
, mud chips, and raindrop impressions indicate that many of the specimens studied were deposited in a shallow aquatic setting characterized by intermittent subaerial exposure.
have been found on bedding planes (Kleesment & Shogenova 2005).
If Stein and his colleagues are on the right track, it would be the first time Curiosity confirmed mud cracks - technically called desiccation cracks
- on Mars.