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Carmelo Formation (conglomerate) at Point Lobos Nagdong Formation at Sangju. Conglomerate (/ k ən ˈ ɡ l ɒ m ər ɪ t /) is a sedimentary rock made up of rounded gravel-sized pieces of rock surrounded by finer-grained sediments (such as sand, silt, or clay). The larger fragments within conglomerate are called clasts, while the finer sediment ...
A cobble (sometimes a cobblestone) is a clast of rock defined on the Udden–Wentworth scale as having a particle size of 64–256 millimeters (2.5–10.1 in), larger than a pebble and smaller than a boulder. Other scales define a cobble's size differently. A rock made predominantly of cobbles is termed a conglomerate.
It is about 150–1,300 m (490–4,300 ft) thick and consists of massive clast-supported pebble and cobble conglomerate beds interbedded with beds of argillite and sandstone. The conglomerates consist of grey feldspathic sand and well-rounded pebbles and cobbles of quartzite, granite, felsite, and quartz monzonite. The 'puddingstone' of the ...
The formation is primarily limestone cobble conglomerate. The massive conglomerate beds are separated by thinner beds of sandstone, shale, claystone, and tuff. The clasts in the conglomerate are of Cretaceous age and contain the foraminiferan Orbitolina and other common Cretaceous fossils. These are embedded in a red arkosic matrix.
This conglomerate consists of pebbles and cobbles of white vein quartz, red and green quartzite, sandstone, red and gray chert, and red shale. The grayish-purple to grayish-red conglomerate and sandstone is cemented largely by hematite and microcrystalline quartz. The cobbles that it contains range in size from 2.5 in (6.4 cm) to 6.5 in (17 cm).
The Pomerado Conglomerate is of the Late Eocene Epoch, and is a massive cobble conglomerate. It is lithologically identical to the local Stadium Conglomerate. [1] It overlies the sandstone Mission Valley Formation. [1] It is the uppermost formation of the Poway Group, and has a maximum thickness of 55 metres (180 ft). [1]
The formation is primarily limestone cobble conglomerate.The massive conglomerate beds are separated by thinner beds of sandstone, shale, claystone, and tuff.The clasts in the conglomerate are embedded in a red arkosic matrix or a poorly sorted limestone conglomerate matrix.
Discontinuous, thin beds of well-rounded, unlaminated white chert cobble conglomerate occur interbedded with the gray and white chert. [1] Facies 3, which overlies facies 2, consists largely of centimeter-layered chert. The layered chert consists of white-gray layered chert and hematitic chert or jaspilite. Barite veins locally cut across the ...