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Summary Of: Concretion

This concretionary cement often makes the concretion harder and more resistant to... Sandstone concretion formed around crystals... Sandstone concretion formed around crystals... Sandstone concretion formed around crystals... the concretion grows as successive layers of mineral accrete to its surface... This process results in the radius of the concretion growing with time... Two cm diameter iron concretion in the Fremont Sandstone near Emery... Two cm diameter iron concretion in the Fremont Sandstone near Emery... Two cm diameter iron concretion in the Fremont Sandstone near... Cannonball concretion in Jameson Land... Cannonball concretion in Jameson Land... Concretion in the Cretaceous of western South Dakota... Concretion in the Cretaceous of western South Dakota... Concretion in the Cretaceous of western South Dakota... A broken concretion with fossils inside... A broken concretion with fossils inside... Prolonged heating of either a pyrite or marcasite concretion will convert portions of either mineral into pyrrhotite causing the concretion to become slightly magnetic...

Encyclodia Page On: Concretion

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enterolith | 1.5 metre diameter 'concretion' found at Lyme Regis. | | Lyme Regis | sedimentary rock | mineral | Latin | strata | weathering | stratum | dinosaur | fossils | pseudofossils | artifacts | The shapes of concretions | | Sandstone concretion formed around crystals | | diagenesis | fossil | World War II | shells | bombs | shrapnel | salt marsh | sediments | Sandstone Concretion at Año Nuevo State Reserve | | Año Nuevo State Reserve | Theodore Roosevelt National Park | North Dakota | carbonate | calcite | silica | chert | flint | jasper | goethite | hematite | dolomite | ankerite | siderite | pyrite | marcasite | barite | gypsum | sulfates | bacteria | Two cm diameter iron concretion in the Fremont Sandstone near Emery, Utah | | Emery, Utah | shales | siltstones | sandstones | Martian spherules | a septarian nodule | | Latin | Septarian nodule in the Bristol City Museum, Bristol, England. This is a local concentration of calcite, forming a hard lump in mudstone. Radiating shrinkage cracks have filled with veins of calcite. From the Oxford Clay, Wiltshire, England. | | Bristol City Museum | Bristol | England | calcite | mudstone | Oxford Clay | Wiltshire | Moeraki Boulders | Paleocene | Moeraki | South Island | New Zealand | Hokianga | North Island | Kimmeridge Clay | England | Cannonball concretion in Jameson Land, East Greenland. | | Jameson Land | Greenland | Concretion in the Cretaceous of western South Dakota. | | A broken concretion with fossils inside; Late Cretaceous near Ekalaka, Montana. | | fossils | Cannonball River | North Dakota | calcite | Utah | Wyoming | Rock City | Ottawa County, Kansas | Moeraki | Lake Huron | Kettle Point, Ontario | Spitsbergen | Canada | Greenland | China | Moqui Marbles, hematite concretions, from the Navajo Sandstone of southeast Utah. Cube is one centimeter square. | | Moqui balls | Navajo Sandstone | pyrite | marcasite | jarosite | Kansas | bentonite | chalk | bivalves | Typical examples of iron sulfide concretions, called “Kansas Pop Rocks”, which are found in the Smoky Hill Chalk Member of the Niobrara Formation of Kansas. Both regular, lefthand row, and polycuboidal, righthand row, varieties shown. These concretions are about 3 centimeters in diameter. | | metamorphic rocks | calcareous ooze | pyrite | marcasite | pyrrhotite | Kansas Geological Survey | Martian spherules | Moqui Marbles | Moeraki Boulders | Mushroom Rock State Park | Rock City, Kansas | Salton Sea | Categories | Sedimentary rocks | Minerals |
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Concretion".