sentences:  Pegmatites of similar foyaitic composition are seen within the mass at two locations and an associated dyke swarm of lamprophyres and picrites extends some 3 km from the mountain.the psammite/shale/marl country rocks of the Breijera formation are well exposed to the west of Serra de Monchique, forming jagged outcrops and dramatic gorges, which since the destructive introduction of eucalyptus farming in 1976, now run dry most of the year round.Serra de Monchique is threatened by continued aggressive eucalyptus 'cash-crop' farming, recent publications have shown the water table to be lowering significantly and many endemic species to be on the brink of extinction, including the Bonellis Eagle, the Iberian emerald lizard  and many more listed under European Union protection.