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  • File:ST53Part01Pg14B.jpg
    ...images a siliciclastic drape sequence that onlaps and overlies a ridge of metamorphic basement rocks. From AAPG Studies in Geology #53: Seismic Interpretation of
    (750 × 633 (197 KB)) - 20:48, 28 July 2015
  • File:M109CH01Polychristalline.jpg
    ..., County Antrim, Northern Ireland, U.K., a polycrystalline quartz grain of metamorphic origin. The grain has sutured internal boundaries between composite crystal
    (655 × 438 (71 KB)) - 20:07, 23 January 2019
  • File:M102Ch1Fg6.jpg
    metamorphic origin (slate); blue-hued quartz grains indicate higher grade metamorphism
    (502 × 518 (978 KB)) - 22:08, 14 August 2014
  • File:NacratonUSGS.jpg
    ...600 million years. This region is made up of a basement older Precambrian metamorphic and igneous rock that is mostly covered by a relatively thin cover of young
    (512 × 599 (332 KB)) - 15:27, 19 August 2014
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