Definition of arkose in English:

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Pronunciation: /ˈɑːkəʊs/
Pronunciation: /ˈɑːkəʊz/


[mass noun] Geology
A coarse-grained sandstone which is at least 25 per cent feldspar.
Example sentences
  • The matrix ranges from sandstone to arkose, and is frequently just fine-grained conglomerate.
  • Ghanem et al. referred to the Hammamat Group as molasse-type sediments that consist of polymictic conglomerate, arkose, greywacke, siltstone and minor mudstone.
  • Conglomerate clasts are principally volcanic rocks and greenish gray chert, with subordinate arkose, graywacke, siltstone, red chert, quartzite, white quartz, and limestone.



Pronunciation: /ˌɑːkəʊsɪk/ Pronunciation: /ˌɑːˈkəʊzɪk/
Example sentences
  • The rocks typically comprise a monotonous sequence of greywackes, reddish-weathering arkosic sandstones, shales and subordinate conglomerates.
  • During this study, however, chlorite associated with the final stages of deformation has been identified in the limestone and arkosic sandstone of the Timirovo thrust system.
  • The upper part is more sandy, containing clean, arkosic, sharp-based sandstones up to 50 cm thick with locally matrix-supported conglomeratic bases.


Mid 19th century: from French, probably from Greek arkhaios 'ancient'.

For editors and proofreaders

Line breaks: ar¦kose

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