OverviewA concretion is a hard and compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical i… See more
Watch full videoOriginsDetailed studies have demonstrated that concretions form after sediments are buried but before the sediment is fully lithified during diagenesis. They typically form when a mineral precipitates and cements sediment a… See more
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Concretions: What Are These Bizarre Rock Formations? (And …
See more on rockseeker.comA concretion is a hard mass found within layers of sedimentary stone. They’re generally round in shape, and each type tends towards one form or another. You shouldn’t confuse a concretion with a nodule. Nodules occur as minerals different from the surrounding layers, while concretions are largely composed of the same …Concretions — Paleontological Research Institution
Apr 3, 2020 · Concretions are commonly misunderstood geologic structures. Often mistaken for fossil eggs, turtle shells, or bones, they are actually not fossils at all but a common geologic …
Rock City: Sandstone Concretions in …
Sep 15, 2016 · Rock City is a park in north-central Kansas that features more than 200 spherical rock formations, some with …
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Concretions and Nodules | Department of Mineral
Sandstone "logs" are elongate sand bodies that have been cemented, principally by calcium carbonate, to form log-like concretions (they are not petrified wood logs, though some could be so mistaken at a distance).
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Concretions, Thunder Eggs and Geodes - Australian …
Concretions are compact, often rounded, accumulations of mineral matter that form inside sedimentary rocks such as shale and sandstone or in soil.
Concretions in the White Cliffs Region - U.S. National …
Jan 12, 2021 · Calcite (calcium carbonate) is the most common cement for sandstone, but the bonding agent for concretions is a much more durable iron compound. As iron carbonate dissolves in groundwater, it precipitates around …
The Moqui Marbles (Navajo Marbles), USA | Geology, …
Jun 5, 2023 · Within the Navajo Sandstone, the process of concretion formation led to the creation of the Moqui Marbles. Concretions are cemented masses of sedimentary rock that form when minerals precipitate and accumulate around …
Concretion | GeoKansas
Concretions are masses of mineral matter embedded within rock layers, including limestone, sandstone, and shale. They often take shape when minerals precipitating (settling) out of water collect around a nucleus, such as a pebble, …
Concretions in sandstones of the Inner …
Jun 26, 2019 · Concretions are a common feature in many sedimentary rocks, yet they seem sometimes to be misunderstood. So, how do concretions form? As well-studied …
How Nature Creates Uncannily Spherical …
Oct 2, 2017 · Some of the biggest examples can be found at Rock City, part of a Kansas state park featuring nearly 200 large sandstone concretions (claimed to be the largest such …
Gogotte Sandstone Concretion - Mardani Fine Minerals
May 16, 2021 · Though technically a “sand concretion,” gogottes are of a special group of concretions that are only found within the Parisian basin (sometimes referred to as the …
Carbonate concretions are common features of sedimentary rocks of all geological ages. They are most obvious in sandstones and mudstones as ovoid bodies of rock that protrude from natural …
Sandstone concretions
Sandstone concretions Lithogenous and biogenous sedimentary rock. Sandstone concretions like these typically nucleate on organic remains or shell material. The remains of the creature that …
Classic Scottish sandstone concretions formed from hot water
Dec 25, 2023 · On the north-west coast of the Isle of Eigg, in the Inner Hebrides of Scotland (Fig. 1), sandstone cliffs are studded with huge, dark ovoid bodies of calcite-cemented sandstone. …
Concretion - GeoKansas
Concretions are masses of mineral matter embedded within rock layers, including limestone, sandstone, and shale. They often take shape when minerals precipitating (settling) out of …
Gogotte Sandstone Concretion - Mardani Fine Minerals
Nov 18, 2021 · It is believed that permafrost interacted with melting, circulating groundwater, and quartz-based sand, combining to create a concrete-like solution that slowly solidified as it …
Calcite-Cemented Concretions in Cretaceous Sandstone
May 1, 2003 · Spheroidal (cannon ball) calcite-cemented concretions, some of gigantic size, were studied from three Cretaceous shelf sandstone units: Ferron, Frontier, and Second Frontier.
Concretions - DesertUSA
Concretions are compact masses of mineral matter, usually spherical or disk-shaped, embedded in a host rock of a different composition. Learn about the varieties, compositions and origins of …
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