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Concretions in Torysh, Western Kazakhstan Concretions with lens shape from island in Vltava river, Prague, Czech Republic Marlstone aggregate concretion, Sault Ste. Marie, Michigan, United States A concretion is a hard and compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary ...
The London Hammer (also known as the "London Artifact") is a hammer made of iron and wood that was found in London, Texas in 1936. Part of the hammer is embedded in a limey rock concretion, leading to it being regarded by some as an anomalous artifact.
They range in diameter from 3 to 6 meters (9.8 to 19.7 ft) with the average diameter being 3.6 meters (12 feet). These concretions lie 2 to 8 meters (6.6 to 26.2 ft) apart. [8] Similar giant calcite-cemented concretions have also been found in a quartzite quarry within Lincoln County and in exposures of the similar age sandstones in Utah and ...
The most striking aspect of the boulders is their unusually large size and spherical shape, with a distinct bimodal size distribution. Approximately one-third of the boulders range in size from about 0.5 to 1.0 metre (1.6 to 3.3 ft) in diameter, the other two-thirds from 1.5 to 2.2 metres (4.9 to 7.2 ft).
The surface of these spherical concretions can range from being very rough to quite smooth. Some of the concretions are grooved spheres with ridges around their circumference. [5] [6] The abundant concretions found in the Navajo Sandstone consist of sandstone cemented together by hematite (Fe 2 O 3), and goethite (FeOOH).
The second feature contained seven concretions. Five of these were elongated, and one was prismatic. These were found in maroon mud, but were grey bodied. Indicating they originated in a different sedimentary environment. All pieces found originated as congealed viscous body fat, but was replaced by minerals from ground water. [2]
They commonly occur as concretions in mudstones and siltstones. Pyrite and marcasite (FeS 2) are sulfide minerals and favor reducing conditions. They are the most common in fine-grained, dark colored mudstones. Hematite (Fe 2 O 3) is usually the pigment in red beds and requires oxidizing conditions.
Overview of the Sierra Madre Oriental, the Mexican mountain range in which the "Monster of Aramberri" was discovered. During an excursion conducted in the fall of 1985, in the Mexican state of Nuevo León, a geology student of the Autonomous University of Nuevo León reported the discovery of a large concretion of fossils in the Sierra Madre Oriental, in the town of Linares, near the ...