mudstone


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mudstone

[′məd‚stōn]
(geology)
An indurated equivalent of mud in the form of a blocky or massive, fine-grained sedimentary rock containing approximately equal proportions of silt and clay; lacks the fine lamination or fissility of shale.
References in periodicals archive ?
Surface water percolated down faults through pyrite-bearing mudstone, reacting with the pyrite to acidify the water and charge the water with sulfate ions.
Lithologically, the OS succession is dominantly composed of alternating intervals of mudstone (MS) oil shale and wackestone (WS) oil shale, the latter with very local occurrences of packstone laminae or nests.
The disappearance of taxa at the base of the Ragavere Formation is evidently caused by lithological changes: at this level marlstone of the Hirmuse Formation is replaced by fine-grained bioclastic wackestone and calcareous mudstone of the Torremagi Member) (Fig.
Contract awarded for Quote guidance of mudstone four driveway re-paving work can notice small
It is mainly composed of homogeneous and submillimetric fecal pellets (50-250 [micro]m), bioclasts (fragments of echinoderms, brachiopods, bivalves, corals, gastropods, ostreids, sponges, small agglutinated forams and miliolids, and solenoporacean red algae) and sub-rounded to rounded submillimeter-sized (50-700 [micro]m) carbonate intraclasts, which have mudstone, bioclastic wackestone, or peloidal packstone textures.
The Xujiahe formation is the main reservoir for the Upper Triassic gas system, and the fifth member of the Xujiahe formation is the main source rock, composed of black shale, grey mudstone, and sandstone.
Rock mass on the Safa dam site is made of sedimentary rocks that composed of alternative layers of marl, mudstone, silty marl and sandstone.
The answer, a historic "yes," came from two mudstone slabs that the rover sampled with its drill.
Their highly dangerous unfenced footpath route has partially been depicted, either a nonsensical seven metres over the cliff edge on official maps, or on crumbling, clearly friable, Ordovician Nantmel Mudstone cliffs, where there is not enough room for a path.
The team from the UK, USA and Japan has discovered a new and scientifically important species of a fossil ostracod- an animal group related to shrimps, lobsters and crabs -- in mudstone rocks from New York State, USA, dating back to the Ordovician period of geological time.
Mission scientists soon realized that much of the terrain was covered in mudstone, silty sediments that settled onto the bottom of an ancient lake.
According to the website of Dinosauria International, the site, located near the village of Ten Sleep, has 'ancient sand and mudstone deposits, dating back to the late Jurassic Period, approximately 150 million years ago'.