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Septarian concretions are found in many kinds of mudstone, including lacustrine siltstones such as the Beaufort Group of northwest Mozambique, [39] but are most commonly found in marine shales, such as the Staffin Shale Formation of Skye, [38] the Kimmeridge Clay of England, [40] [41] or the Mancos Group of North America. [42]
Some 350 named species of plant have been found, making the London Clay flora one of the world's most diverse for fossil seeds and fruits. [11] The flora includes plant types found today in tropical forests of Asia and demonstrates the much warmer climate of the Eocene epoch , with plants such as Nypa (Nipah palms) and other palms being ...
The composition of the Moeraki Boulders and the septaria that they contain are typical of, often virtually identical to, septarian concretions that have been found in exposures of sedimentary rocks in New Zealand and elsewhere. Smaller but otherwise very similar septarian concretions are found within exposures of sedimentary rocks elsewhere in ...
The geodes containing the Bristol Diamonds are frequently found in this conglomerate, in the areas of Bridge Valley Road, Leigh Woods, Sea Mills and St Vincent's Rocks. [ 6 ] [ 7 ] [ 8 ] The geodes were formed from quartz, either megaquartz or fibrous quartz, the diamonds themselves resulting from the dissolution of nodules of anhydrite leaving ...
Devonian nodular limestone Concretionary nodular limestone at Jinshitan Coastal National Geopark, Dalian, China. In geology and particularly in sedimentology, a nodule is a small, irregularly rounded knot, mass, or lump of a mineral or mineral aggregate that typically has a contrasting composition from the enclosing sediment or sedimentary rock.
Researchers have discovered a megastructure in the Baltic Sea that was likely once used by hunter-gatherers to hunt reindeer nearly 11,000 years ago.
Thundereggs are found in flows of rhyolite lava. They form in the lava from the action of water percolating through the porous rock carrying silica in solution. The deposits lined and filled the cavity, first with a darker matrix material, then an inner core of agate or chalcedony.
The oldest known tablet inscribed with the Ten Commandments from the Old Testament sold on Wednesday for $5.04 million, more than double its high estimate.. The stone, which dates back around ...
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