Despite the fact that the observation of microbial mat features is a strictly morphological criterium to assign a microbial origin to a sedimentary structure
, it is a critical tool for the identification of biosignatures inside the frame of the search of life in extraterrestrial settings.
She further states that there is a possibility that the sedimentary structure
on Mars may not have biological origin.
Shinn (1983) noted that no single sedimentary structure
is more indicative of the upper intertidal and the supratidal depositional environment than mudcracks caused by shrinkage of carbonate mud.
Some cores showed the presence of sedimentary structure
, which included cross bedding, cross lamination, and parallel laminations.
Cross bedding is a common sedimentary structure
in many depositional environments, being largely defined by internal grain size variations and sorting from fine sand to granules.
and early diagenetic features of shallow marine carbonate deposits: SEPM Atlas Series no.1.
Flaser bedding is the dominant sedimentary structure
in the sandstones beds; asymmetrical ripples are abundant and burrows are moderately common, indicating a marine environment with rapidly changing current speeds.
Paleoecology of main biota (calcispheres, planktons and filaments) and microscopic sedimentary structure
recorded in microfacies reveal that Kawagarh Formation was deposited over mid and outer ramp settings as deepening upward sequence.
Hornfels alteration of the claystone in the core-hole is based on the destruction of bedding, sedimentary structures
and increased hardness with bleaching.
Each unit exhibits a clear set of sedimentary structures
and a specific lithology that correlate well between the two cores.
The petrographically and geochemically determined tectonic setting, physiography of the region and the southeast dominated paleo-current direction, as deduced from the observed sedimentary structures
, all suggest Indian Craton as the most probable source area for the Tredian sediments.
The typical sedimentary structures
of UDC are scour surface (Figs.