mud crack

mud crack

[′məd ‚krak]
(geology)
An irregular fracture formed by shrinkage of clay, silt, or mud under the drying effects of atmospheric conditions at the surface. Also known as desiccation crack; sun crack.
References in periodicals archive ?
The improved mud crack resistance is a consequence of the effect of MFC on the drying of the film.
On the bad board, the intermetallic layer is not continuous, and the mud crack affected [Ni.sub.3]P layer has formed on top of the nickel.
Dr Poropat said that many of the footprints were surrounded by concentric mud cracks that were propagated through the once-moist sediment by the weight of the sauropods footfalls.
First spotted by the rover Curiosity in 2017, the crisscrossed land features looked pretty similar to desiccation or mud cracks found commonly on Earth.
This composite image of two 25-second exposures taken from the same location in Death Valley, California, captured the glow of the Milky Way above desert mud cracks just before sunrise on April 2, 2017.
The abrupt edge of the deposit demonstrates how such mud cracks can lead to delamination and loss of deposit, as well as new growth.
Mud cracks on the top of the muddy limestone and large-scale erosional features (Fig.
The team believes that thermal fracture and desiccation fracture (formed like mud cracks in a dry lake bed) may be launching small dust particles that are then picked up by sunlight and pushed into the tail.
Boulder-sized examples of each of Grand Canyon's rock layers, many collected by raft from the canyon's bottom, have been placed along the trail at their "birthdays." People talk about and touch these beautiful examples of 1.7-billion-year-old folds, 1.2 billion-year-old mud cracks, 800-million-year old algal reefs, and 270-million-year-old fossils.
Above the basal conglomerate of the Tapeats, the rest of the formation is composed of sand about 200 feet thick, with bedding containing sedimentary structures typical of tidal flat, beach, and shallow-shore environments that include ripple marks, mud cracks, and raindrop prints (Fig.
The fractures resemble mud cracks on Earth, which form when water-soaked soil dries and contracts, notes rover researcher John Grotzinger of the Massachusetts Institute of Technology.
The parched mud cracks, and the top layers turn black and shrivel like burned bacon.