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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]
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 ...
Nodule is also used for widely scattered concretionary lumps of manganese, cobalt, iron, and nickel found on the floors of the world's oceans. This is especially true of manganese nodules. Manganese and phosphorite nodules form on the seafloor and are syndepositional in origin. Thus, technically speaking, they are concretions instead of nodules.
Discovered in the Harrat al ‘Uwayrid lava field, the circles range in diameter from 13 to 26 feet, and all date to about 7,000 years ago. The team found evidence of stone walls and at least one ...
Hunting sites around the world. The discovery marks the first Stone Age hunting structure in the Baltic Sea region. But other comparable prehistoric hunting structures have been found elsewhere ...
Fossils may be found either associated with a geological formation or at a single geographic site. Geological formations consist of rock that was deposited during a specific period of time. They usually extend for large areas, and sometimes there are different important sites in which the same formation is exposed.
The discovery of the oldest known Earth rock, found on the Moon, was reported in January 2019 by NASA scientists. Apollo 14 astronauts returned several rocks from the Moon and, later, scientists determined that a fragment from one of the rocks, nicknamed Big Bertha , contained "a bit of Earth from about 4 billion years ago".
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 ...