A coarse-grained sandstone that is at least 25 percent feldspar.
- 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.
- 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'.
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