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The Brazil Formation was named in 1902 for the city of Brazil, located in Clay County, Indiana. It originally included rocks between the bottom of the Petersburg Coal and the top of the Mansfield Sandstone. In 1922, a new survey resulted in restrictions to include only rocks between the Lower Block Coal Member and what was at the time called ...
The Linton Formation is a geologic formation in Indiana.It is the lower formation in the Carbondale Group, and includes six named members, "which, in ascending order, are the Seelyville Coal, Coxville Sandstone, Colchester Coal, Mecca Quarry Shale, Velpen Limestone, and Survant Coal Members, and unnamed units of sandstone, shale, and clay".
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 ...
A concretion is a volume of sedimentary rock in which a mineral cement fills the porosity (i.e. the spaces between the sediment grains). The image shows a Sandstone Concretion in the wall at the beach of Año Nuevo State Reserve. This concretion was too high in the wall to place a ruler, but I estimate it to be about 400 mm long.
The Mississippian Borden Formation is a mapped bedrock unit in Kentucky, Indiana, Illinois, Ohio, West Virginia, [7] and Tennessee. It has many members, which has led some geologists to consider it a group (for example in Indiana [ 8 ] ) rather than a formation (for example in Kentucky [ 1 ] [ 4 ] ).
In West Virginia, the Marcellus may be separated from the brown shales of the Mahantango by occasional sandstone beds and concretions, [49] or it may lie directly below the younger Late Devonian Harrel Formation (or its lateral equivalents) because of a disconformity, [50] which represents a gap in the geological record due to a period of ...
The ironstone concretions are recovered from exposures along streams, roadcuts and in active or abandoned coal mine areas. Most concretions are found among the shale and sandstone that was piled up in either a spoil tip of an older underground mine, or ridges of the later surface mining .
Devonian nodular limestone Concretionary nodular limestone at Jinshitan Coastal National Geopark, Dalian, China. In geology and particularly in sedimentology, a nodule is a small, irregularly rounded knot, mass, or lump of a mineral or mineral aggregate that typically has a contrasting composition from the enclosing sediment or sedimentary rock.