Apr 20, 2018 · The mass of C within a tusk-shell spherical concretion is given by: Vc = 4/3πr c 3 · d(c) · n c, where r c is the radius of a concretion (mean value; 0.75 cm), d(c) is the average density of a ... Anjani Portland Cement News: This is the News-site for the company Anjani Portland Cement on Markets Insider Indices Commodities Currencies StocksIron-oxide nodules or concretions are the most common kind of meteorwrong sent to us. Hematite and magnetite are two common iron-oxide minerals. Most iron ore deposits consist mainly of hematite, magnetite, or both. Iron-oxide concretions, iron-oxide nodules, and ironstones are often mistaken for meteorites because they are heavy (dense) and their …Septarian concretions or Septarian nodules, are concretions containing angular cavities or cracks, which are called "septaria". The word comes from the Latin word septum; "partion", and refers to the cracks/separations in this kind of rock. Besides clayminerals and calcite cement, septarian concretions from the Rupelian Clay in its type locality, can contain accessory minerals such as pyrite nodules …Septarian concretions seem to be nearly restricted to Phanerozoic strata, and this may have impli-cations for microbial evolution and the dynamics of the carbon cycle. They occur in many marineSeptarian Nodules. Septarian nodules are distinctly sphere-like concretions that are characterized by a series of cracks that widen towards the center and die out towards the sides of the concretion. These radiating cracks are often crossed by a series of concentric cracks giving them a "turtle-back" appearance.Detailed chemical and isotopic studies of mineralization of septarian fractures in concretions in the Devonian Marcellus Shale document a complicated paragenesis involving multiple episodes of ...A concretion is a volume of sedimentary rock in which a mineral cement fills the porosity (i.e. the spaces between the sediment grains). Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin con meaning 'together' and cresco meaning 'to grow'. Concretions form within layers of …Septarian concretions form when a cementing mineral is precipitated in mud-rich sediments that are not yet consolidated to rock. Here the likely cementing ...The dark shales of the Cretaceous have a special type called septaria or septarian concretions. These are large concretions cut by many veins filled with yellow to brown calcite and occasionally other minerals, such as barite, gypsum, sphalerite, or quartz.Apr 14, 2020 ... These concretions are thought to have formed during #diagenesis over the course of 4 to 5 million years. Quite possibly some of the weirdest ...A concretion consists of the same material as the rock around it, plus the cementing mineral, whereas a nodule (like flint nodules in limestone) is composed of different material. Concretions can be shaped like cylinders, sheets, nearly perfect spheres, and everything in between. Most are spherical.Septarian concretions are abundant in many Phanerozoic marine and marginal-marine shales and mudstones. They range from a few centimetres to several metres in size and are spherical or ellipsoidal ...Mar 28, 2023 · Septarian Concretion. A concretion is a mass of mineral matter embedded within rock layers, including shale, limestone, and sandstone. They take shape when minerals settling out of water collect around a nucleus, like a leaf, pebble, bone, shell, or fossil. Concretions are generally harder than the rocks surrounding them. Septarian concretions and carbonate cretions also occur but are numerically less important. The concretions commonly tain well preserved fossils including large wood fragments, ammonites, bivalves, crabs and gastropods, but many are devoid of biogenic debris other than granule toHere we present carbonate clumped-isotope, d 13 C (d 13 C carb), and d 18 O (d 18 O carb) values for septarian concretions taken from four host units in order to assess cement paragenesis and ...Apr 29, 2021 · This process cemented the sand grains together aided by the pressure of additional sediment deposited above. The concretions formed as the calcium ions were preferentially and chemically drawn to organic matter such as the clusters of dead clams and their shells. The organic matter formed a nucleus around which the spherical concretions could grow. Carlile shale--Shale. chalky in lower part and containing thin chalk beds near the base, black fissile shale and large septarian concretions in upper part, fine-grained sandstone at top; marine. Occurs in northwestern and …The name septarian originates from the Latin word saeptum (enclosure or wall), referring to the raised cracks on the outside of some septarian concretions. If you are interested in hunting for septarian concretions in New Mexico, many are found in the Mancos Shale, a marine Cretaceous unit found in northwest New Mexico.Septarian geodes start out as concretions or balls of mud which form around organic matter. Cracks form in these concretions likely as they dry out and shrink. These cracks are then filled with minerals such as calcite (yellow) and aragonite (brown) causing the very distinctive patterns. These septarian geodes make for very aesthetic display ...Septarian stone is a tri-colored concretion composed of multiple minerals. Concretions are cemented bodies of sediment found in sedimentary gemstones. In other words, they’re beautiful balls of hardened mud. Septarian’s three most common colors are brown (from aragonite), yellow (from calcite), and gray (from limestone). It's often called ... Septarian or Lightning Stone is a concretion of hard, compact mass of matter 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 in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin con ...septarian nodules are perhaps the most attractive and bizarre. In Essex, septarian nodules occur in the London Clay which dates from the Eocene period but nodules of Jurassic age occur in the till, or boulder clay, having been brought south to Essex by the ice sheet from the Midlands. Exactly how septarian nodules, or septarian concretions,A concretion is a hard, 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 in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin concretio " compacting, condensing, congealing, …Septarian concretions exhibit multiple generations of cements that include body, fringe, and spar phases. Classic paragenetic interpretations include initial precipitation of the body followed by ...Septarian concretions and carbonate cretions also occur but are numerically less important. The concretions commonly tain well preserved fossils including large wood fragments, ammonites, bivalves, crabs and gastropods, but many are devoid of biogenic debris other than granule toCalcite filled septarian nodules from Muddy Creek, Utah are a US classic and are outstanding decorator pieces. Septarian nodules are concretions containing angular cavities or cracks, which are called "septaria". The shrinkage voids in this large sawed and polished concretion are filled with four generations of colorful calcite, first the light ...Cone Member (Kmc): Calcareous, dark gray shale and thin limestone beds and lenses. Widespread bentonite bed and septarian concretions near base. Shallow marine. Thickness as much as 20 m (66 ft). Floweree Member (Kmfl): Dark gray, noncalcareous shale with interbeds of siltstone. Calcareous concretions and scattered granules of dark …Septarian Nodule, also referred to as Dragon Stone, is a tri color concretion composed of Aragonite (the brown), Calcite, (the yellow), and Limestone (the grey). The name comes from the word “Septaria”, which usually refers to any concretion with internal cavities or cracks. This unique mineral was formed around 50 to 70 million years ago ... Concretions vary considerably in their compositions, shapes, sizes and modes of origin. Septarian concretions Septarian concretions (or septarian nodules) are carbonate-rich concretions containing angular cavities or cracks (septaria; sg. septarium, from the Latin septum "partition, separating element", … See moreThe concretions also show a range of cement types, even within a single concretion. Preservation of uncompacted burrows and minus cement porosities (MCP) indicate that the concretions formed during early diagenesis. These data have been used to constrain the timing of authigenic mineral formation in both the mudrocks and concretions.Dec 12, 2017 · This is a polished slice of a septarian nodule from the famous Muddy Creek location in Orderville, Kane Co., Utah. The interior of these nodules are often brightly fluorescent and phosphorescent under UV, as is the case with this example. The size of this specimen is 14 x 12 x 1.25 cm, and it weighs 346 grams. Septarian nodule from Orderville, Utah, showing bright fluorescent response under ... Apr 20, 2018 · The mass of C within a tusk-shell spherical concretion is given by: Vc = 4/3πr c 3 · d(c) · n c, where r c is the radius of a concretion (mean value; 0.75 cm), d(c) is the average density of a ... Exactly how septarian nodules, or septarian concretions, were formed remains a mystery. Over millions of years they were entombed in the clay and gradually ...On the Lake Erie beach there are many oddly-shaped rocks called septarian concretions. Shaped and patterned similar to a tortoiseshell, naturalists in the past speculated that these oddities were dinosaur eggs and carvings by ancient humans. However, scientists have discovered that septarian concretions are mineral deposits that form around a ...Welcome to our Septarian Concretion page! Septarians were formed approximately 110 million years ago when the Gulf of Mexico reached what is now southern Utah. …Jan 1978. Kitty L. Milliken. PDF | On Jan 1, 1978, Mark W. Hounslow published Septarian concretions | Find, read and cite all the research you need on ResearchGate.Septarian Nodule, also referred to as Dragon Stone, is a tri color concretion composed of Aragonite (the brown), Calcite, (the yellow), and Limestone (the grey). The name comes from the word "Septaria", which usually refers to any concretion with internal cavities or cracks.Septarian concretions in the Staffin Shales Formation (Kimmeridgian, Isle of Skye) allow controls on concretion rheology and septarian cracking to be investigated. Stratabound concretions consist of anhedral ferroan calcite microspar enclosing clay …Jul 9, 2018 · Burial histories of septarian concretions from the Eocene London Clay and the Jurassic Kimmeridge Clay show that fracturing can form under as little as 50 m of sediment. By relating episodes of septarian fracturing to times of rapid burial, the timing of diagenetic cement formation can be constrained. Geode. Quartz -filled geode, shown from inside (top) and outside (bottom) A geode ( / ˈdʒiː.oʊd /; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are ...Mar 11, 2010 · Calcareous septarian concretions are found through a greater stratigraphic range than the other kinds. The position of the lowest septarian-concretion zone of the member ranges from 30 feet above the base, in Osborne County, to about 70 feet above the base, in Finney County. TOP! Natural dragon septarian sphere Crystal ball specimen healing 40-50mm 1PC. $13.91. Was: $15.99. Free shipping. or Best Offer. 21.5 Gr. Septarian Dragon's Egg Prophet's Stone Lightning Stone! RE2105. $12.95.Jul 9, 2018 · Burial histories of septarian concretions from the Eocene London Clay and the Jurassic Kimmeridge Clay show that fracturing can form under as little as 50 m of sediment. By relating episodes of septarian fracturing to times of rapid burial, the timing of diagenetic cement formation can be constrained. Ancient mudrocks contain carbonate concretions more or less abundantly (e. g. , šRÁMEK 1978). There is strong evidence that a considerable proportion of the ancient carbonate concretions were formedGujarat Sidhee Cement News: This is the News-site for the company Gujarat Sidhee Cement on Markets Insider Indices Commodities Currencies StocksIron-oxide nodules or concretions are the most common kind of meteorwrong sent to us. Hematite and magnetite are two common iron-oxide minerals. Most iron ore deposits consist mainly of hematite, magnetite, or both. Iron-oxide concretions, iron-oxide nodules, and ironstones are often mistaken for meteorites because they are heavy (dense) and their …Septarian concretions or Septarian nodules, are concretions containing angular cavities or cracks, which are called "septaria." The cracks vary in shape and ...Directions to Muddy Creek Septarian Nodule Dig: 1. Drive South on I-15 for 177 miles to the turnoff for US-20 (exit 95) 2. Turn left (East) onto US-20 toward US-89/Panguitch/Kanab. 3. Drive 20.5 miles on US-20 until you run into US-89. Turn right (South) onto US-89 and drive 10.1 miles into the town of Panguitch. 4.Jul 2, 2021 ... hello, what you have is a rock (sandstone, I think---pixelation issue) that has fractures with secondary quartz infill.Septarian cements in concretions, despite their enclosure in relatively impermeable host sediment, can act as sensitive indicators of relative sea-level fluctuations. Discover the world's research ...Septarian is a grey limestone rock where the cracks and larger cavities were filled with calcite, barite, aragonite, and other minerals. Septarian is often referred to as “Dragon Stone” or a “Dragon Egg”, and are often called septarian nodules. Often there is crystallization in the larger cavities of the septarian rock creating a geode ...Syneresis within the concretions can cause septarian fractures to occur. Secondary minerals may precipitate and fill voids left by decaying tissues. Tidal laminae are often compressed around concretions, suggesting that compaction of the sediment occurred after lithification of the proto-concretion (Kuecher et al. 1990). Based on Baird et …The concretions from the Eferding Formation are likely formed as an early diagenetic product after sedimentation of the fine-grained muds (Selles-Martinez, 1996; Seilacher, 2001). Evidence for an early diagenetic formation of the calcareous concretions from the Eferding Formation comes from the exceptionally well-preserved fossils, such as ...Septarian cements in concretions, despite their enclosure in relatively impermeable host sediment, can act as sensitive indicators of relative sea-level fluctuations. Discover the world's research ...Septarian or Lightning Stone is a concretion of hard, compact mass of matter 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 in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin con ...If split open, concretions tend to be round externally and are often heavily layered internally. Due to their round shape, concretions can be mistaken for eggs, marbles or bowling balls. One particular type, called a septarian concretion or septarian nodule, contains numerous angular cracks that form a network, usually in a contrasting colour.Petrographic, chemical and isotopic studies of marine sediment-hosted septarian concretions from Lower Jurassic Whiteaves Formation in the Queen Charlotte Islands, B.C., Canada, reveal a complex diagenetic history that has resulted from bacterially mediated reactions at shallow burial depth as well as hydrothermally modified meteoric waters.A concretion consists of the same material as the rock around it, plus the cementing mineral, whereas a nodule (like flint nodules in limestone) is composed of different material. Concretions can be shaped like cylinders, sheets, nearly perfect spheres, and everything in between. Most are spherical.If you’re in the market for a concrete pump, it’s important to choose the right one for your construction project. A concrete pump is an essential tool that helps you transport and place concrete quickly and efficiently.The geologic history of the Southeastern United States of America is missing nearly 350-million-years of rocks, sediments, and fossils. This gap defines the Fall Line nonconformity where Upper Ordovician consolidated rocks are directly overlain by Upper Cretaceous unconsolidated sediments of the Atlantic Coastal Plain Province. Here we …The concretions studied by Hendry et al. (2006) are typical of many septarian concretions, so shrinkage is equally typical of other examples. Neither Astin's (1986) nor Pratt's (2001) hypotheses can adequately explain shrinkage of the body of septarian concretions, nor the fact that the cracks thin towards the margins of the …Concretions from Upper Cambrian sediments in South Wales can be divided into two groups of different ages. An early group (type) are characterised by the association of septarian structures and deformed laminae; whilst later (type Ha) concretions developed both cone-in-cone structures and parallel laminae.Determinations of the cement content …The dark shales of the Cretaceous have a special type called septaria or septarian concretions. These are large concretions cut by many veins filled with yellow to brown calcite and occasionally other minerals, such as barite, gypsum, sphalerite, or quartz.Septarian concretions can be located in this area as well, especially in Hobby Lake. The limestone in Smoky Hills formed in the Cretaceous Period. Cherokee County. Cherokee County is another great place for rockhounding in Kansas. You can find chalcopyrite, galena, fossils, limestone, chert, and calcite, and the county is also filled …Septarian concretions in the Staffin Shales Formation (Kimmeridgian, Isle of Skye) allow controls on concretion rheology and septarian cracking to be investigated. Stratabound concretions consist of anhedral ferroan calcite microspar enclosing clay …Septarian concretions or septarian nodules, are concretions containing angular cavities or cracks, called “septaria”. Concretions are often ovoid or ...Septarian concretions exhibit multiple generations of cements that include body, fringe, and spar phases. Classic paragenetic interpretations include initial …Septarian concretions exhibit multiple generations of cements that include body, fringe, and spar phases. Classic paragenetic interpretations include initial …An extravagant case in point of septarian concretions is found eroding out of Paleocene mudstone of the Morikis, South Island and New Zealand. Comparable concretions called "Koutu Boulders", is formed along the beach of Koutu and Kauwhare points along the south shore of the Hokianga and Harbour of Hokianga.Jan 9, 2018 · Septarian concretions are interesting phenomena in their own right as they are characterised by unique fissures (aka the septaria) that are quite similar to turtle shells in appearance. Geologists believe septarian concretions are caused by a deposition of minerals like calcite (i.e. calcium carbonate), which is the main component of limestone ... Septarian Nodule also known as Concretion, Dragon stone or sometimes as aka Septoria captures the viewer along with the wearer’s attention through its playful patterns and colors. It is said to stimulate the pulsating energies of fun, stratagem and opens to the higher vibrational emotions within the physical body. According to QUIKRETE’s online calculator, the amount of concrete needed for a 10- by 10-foot slab depends on the thickness of the slab. For a 4-inch slab, either eight 60-pound or six 80-pound bags are required, while for a 6-inch slab, ei...Concretions in Kansas are formed from any of a number of minerals, including calcite, limonite, barite, pyrite, and silica. They vary widely in shape and size, with the huge spherical concretions at Rock City in Ottawa County and Mushroom Rock State Park in Ellsworth County measuring up to 27 feet in diameter. Septarian concretions The process that created the septaria, which characterize septarian concretions, remains a mystery. A number of mechanisms, i.e. the dehydration of clay-rich, gel-rich, or organic-rich cores; shrinkage of the concretion's center; expansion of gases produced by the decay of organic matter; brittle fracturing or shrinkage of the concretion interior by either earthquakes or compaction; and others ...Carbonate concretions in Upper Jurassic Kimmeridge Clay Formation from three overpressured wells provide a detailed record of pore fluid evolution in the Outer Moray Firth/Northern Central Graben. The concretions contain multiple generations of septarian cements, with morphologies ranging from simple cracks to complex fractures.Septarian and non-septarian concretions have been found in the upper portion of the Blufftown Formation at several locations along a section of Hannahatchee Creek, in Stewart County, Georgia.The non-septarian concretions began growth later within the sulphate-reduction zone and have had a simpler burial history while the pyrite/calcite concretions show carbonate cementation in the sulphate-reduction-methanogenesis transition zone. A ferroan dolomite/calcite septarian nodule with decarboxylation zone characteristics also occurs.Authigenic minerals forming at shallow depths. Shallow sediment can be subjected to marked chemical changes and/or high flux of pore water. As a result, large volumes of early cements can form such as carbonate concretions of calcite, siderite, dolomite, or pyrite (e.g., Curtis et al., 1986; Hayes and Boles, 1993).High fluid flux can result in leaching of …Concretions from Upper Cambrian sediments in South Wales can be divided into two groups of different ages. An early group (type) are characterised by the association of septarian structures and deformed laminae; whilst later (type Ha) concretions developed both cone-in-cone structures and parallel laminae.Determinations of the cement content …Oct 9, 2008 · Septarian concretions are abundant in many Phanerozoic marine and marginal-marine shales and mudstones. They range from a few centimetres to several metres in size and are spherical or ellipsoidal in morphology. In general, formation by localized calcite or siderite cementation in argillaceous sediments began under less than a few metres of burial. Septarian nodules start out as concretions, which are basically solidified balls of mud. Concretions generally form around a nucleus of organic matter, such as a shell and are almost always found in sedimentary rocks that were deposited underwater. These concretions then become cracked through geological processes. Gray shale containing abundant septarian concretions. Gray interbedded shale, sandstone, and car bonaceous siltstone, containing a thin promi nent sandstone bed 60 ft above the base (marker bed C-2), and a distinctive zone of septarian concretions 100 ft above the base (marker bed C-3). Thickness (feet) 0-20 0-25 0-20 0-50 0-100 10 U20The formation of septarian concretions in Queen Charlotte Islands, B.C.; evidence for microbially and hydrothermally mediated reactions at shallow burial depth Journal of Sedimentary Research Reservoir Characterization and Diagenesis of the Oligocene 64-Zone Sandstone, North Belridge Field, Kern County, CaliforniaJan 1978. Kitty L. Milliken. PDF | On Jan 1, 1978, Mark W. Hounslow published Septarian concretions | Find, read and cite all the research you need on ResearchGate.One of the lesser understood features of concretions is a variety of heavily fractured concretions, named septarian concretions. By taking a new approach in the study of septarian fracture patterns, it is possible to connect the episode of fracturing to a wider tectonic event and better understand how and when they fractured. In March 2019 ...The concretions can be divided into two types based on the developing stratum, the occurrence, the composition of minerals, the carbon and oxygen isotopes and the composition of strontium isotope. The type A concretions occurred in shale succession at the bottom of Chang 7 3 sub-member, and they were mainly composed of calcite. The carbon ...End your day at Lake Erie State Park where you can scour the beach for odd-shaped rocks called septarian concretions, which tend to resemble tortoise shells. Perhaps you’ll see a bald eagle flying overhead but if not, simply take in the expansive views of Lake Erie. Go at sunset if possible.
The mass of C within a tusk-shell spherical concretion is given by: Vc = 4/3πr c 3 · d(c) · n c, where r c is the radius of a concretion (mean value; 0.75 cm), d(c) is the average density of a .... Chieck diallo
Definition of septarian concretion. See: septarium. Click here to see list of references, authorities, sources and geographical terms as used in this glossary. Prev: septarian …Septarian concretions occur at several horizons within the Oxford Clay Formation, a marine mudstone containing pristine aragonite and immature biomarker molecules. They record the passage of at least four generations of pore fluids, the first of marine origin and the last still present in cavities. Concretion bodies formed, cracked, …Jan 9, 2018 · Septarian concretions are interesting phenomena in their own right as they are characterised by unique fissures (aka the septaria) that are quite similar to turtle shells in appearance. Geologists believe septarian concretions are caused by a deposition of minerals like calcite (i.e. calcium carbonate), which is the main component of limestone ... According to QUIKRETE’s online calculator, the amount of concrete needed for a 10- by 10-foot slab depends on the thickness of the slab. For a 4-inch slab, either eight 60-pound or six 80-pound bags are required, while for a 6-inch slab, ei...Septarian concretions can be located in this area as well, especially in Hobby Lake. The limestone in Smoky Hills formed in the Cretaceous Period. Cherokee County. Cherokee County is another great place for rockhounding in Kansas. You can find chalcopyrite, galena, fossils, limestone, chert, and calcite, and the county is also filled …Nov 1, 1996 · The concretions from the Eferding Formation are likely formed as an early diagenetic product after sedimentation of the fine-grained muds (Selles-Martinez, 1996; Seilacher, 2001). Evidence for an early diagenetic formation of the calcareous concretions from the Eferding Formation comes from the exceptionally well-preserved fossils, such as ... Exactly how septarian nodules, or septarian concretions, were formed remains a mystery. Over millions of years they were entombed in the clay and gradually ...Jan 1978. Kitty L. Milliken. PDF | On Jan 1, 1978, Mark W. Hounslow published Septarian concretions | Find, read and cite all the research you need on ResearchGate.Definition of septarian concretion. See: septarium. Click here to see list of references, authorities, sources and geographical terms as used in this glossary. Prev: septarian …Septarian A concretion is a hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil.[1] Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin con meaning 'together' andCalcian-siderite ironstones and ferroan-calcite septarian concretions formed in early diagenesis at very shallow depths. The siderite shows between 1 and 10 mol percent Ca substitution. The substitution is facies-related, and greatest in marine and 'brackish' sediments. Ferroan calcite occurs in associated with glauconie within marine sediments ...Septarian carbonate concretions in marine mudrocks contain calcite cements that should represent evolving conditions from ambient temperature, shallow subsurface environments to warmer, burial diagenetic conditions.It has long been recognized as a layer of bored and encrusted, early diagenetic, clay-hosted septarian concretions coincident with a biostratigraphic gap of three ammonite subzones. Several different types of concretion of variable complexity can be distinguished, of which two, probably derived from slightly different stratigraphic levels, have been juxtaposed by …An extravagant case in point of septarian concretions is found eroding out of Paleocene mudstone of the Morikis, South Island and New Zealand. Comparable concretions called "Koutu Boulders", is formed along the beach of Koutu and Kauwhare points along the south shore of the Hokianga and Harbour of Hokianga.Septarian Concretion A concretion is a hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Septarian concretions are concretions containing angular cavities or cracks, called "septaria".Septarian Concretion. A concretion is a mass of mineral matter embedded within rock layers, including shale, limestone, and sandstone. They take shape when minerals settling out of water collect around a nucleus, like a leaf, pebble, bone, shell, or fossil. Concretions are generally harder than the rocks surrounding them..
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