Sentence Examples


  • It is worthy of note that the dykes and sheets of felsite are seldom pierced by the basalt dykes and are probably about the most recent of the intrusive rocks.
  • In the south of the island there are sills and dykes of felsite, quartz-porphyry, rhyolite, trachyte and pitchstone.
  • The felsite sheets are well represented in Holy Island.
  • The orthoschists are white mica-schists produced by the shearing of acid rocks, such as felsite and porphyry.
 
 

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