sedimentary structure

sedimentary structure

[¦sed·ə¦men·trē ′strək·chər]
(geology)
A structure in sedimentary rocks, such as cross-bedding, ripple marks, and sandstone dikes, produced either contemporaneously with deposition (primary sedimentary structures) or shortly after deposition (secondary sedimentary structures).
References in periodicals archive ?
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.
Sedimentary structure 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.
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.