Search results
Results from the WOW.Com Content Network
Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, [1] [2] categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires. Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.
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. Examples include pyrite nodules in coal, a chert nodule in limestone, or a phosphorite nodule in marine shale.
Paramoudras, paramoudra flints, pot stones or potstones are flint nodules found mainly in parts of north-west Europe: Norfolk (United Kingdom), Ireland, Denmark, Spain and Germany. In Norfolk they are known as pot stones and can be found on the beach below Beeston Bump just outside Beeston Regis. In Ireland they are known as paramoudras.
[34] [35] Septarian nodules are characteristically found in carbonate-rich mudrock. They typically show an internal structure of polyhedral blocks (the matrix) separated by mineral-filled radiating cracks (the septaria) which taper towards the rim of the concretion. The radiating cracks sometimes intersect a second set of concentric cracks.
An eolith (from Greek "eos", dawn, and "lithos", stone) is a flint nodule that appears to have been crudely knapped. Eoliths were once thought to have been artifacts, the earliest stone tools, but are now believed to be geofacts (stone fragments produced by fully natural geological processes such as glaciation).
Krzemionki, also Krzemionki Opatowskie ([kʂɛˈmʲjɔnkʲi ɔpaˈtɔfskʲɛ], "Opatów silica-mine"), is a Neolithic and early Bronze Age complex of flint mines for the extraction of Upper Jurassic banded flints located about eight kilometers north-east of the Polish city of Ostrowiec Świętokrzyski.
Main article: Flint. A hard, sedimentary cryptocrystalline form of the mineral quartz, [14] [15] categorized as a variety of chert. It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones. [16] [17] Inside the nodule, flint is usually dark grey, black, green, white, or brown in color, and often has a glassy ...
A mummified toad within a hollow flint nodule, presented by Charles Dawson and claimed to have been found by workmen in a Lewes quarry around 1900. It is thought to be a fake. Booth Museum, Brighton. At times, a number of animals are said to have been encased in the same place.