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Rwy'n cyfieithu disgrifiad o SoDdGA Porth Sain Ffraid yn Sir Benfro ac mae'n llawn termau daearegol.  Oes gan rywun syniad beth yw'r termau sydd wedi'u hamlygu, os gwelwch yn dda?
 

 " Cliff and foreshore outcrops provide critical exposures of the Johnston Thrust, one of the most important structures formed during the Variscan mountain building episode (orogeny) in South Wales "
 
Diolch yn fawr
 
Hg

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