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辽宁省沈大线上的海城县有丰富的硅砂岩.所谓砂岩,就是砂粒结在一起而形成的岩石,它只需较小的外力(例如有的只要石头对敲),就能沿砂粒结合处碎裂成单个或复合的砂粒.海城砂岩有两种:一种呈粉红色,砂粒间结合较松,砂粒也较大,当地人称之为凤化岩;另一种呈白色,砂粒间结合紧密,有的甚至看不出砂粒状桔合.这种岩砂粒较细,一般称为硬岩.硬软两种有时相距只几公尺,中间夹着不硬不软的岩层.它们表层
Haicheng County, Liaoning Province, Shenyang-Dalian line is rich in silica sandstone called sandstone is formed by the sand together with the rock, which requires only a small external force (for example, as long as the stone on the knock), along the sand There are two kinds of sandstone in Haicheng: one is pink, the sand is more loosely combined and the sand is larger, which locals call phoenix rock; the other is white sand Some are even close to each other, and some do not even see the sand-like orange, which is thin and commonly referred to as hard rock, hard and soft sometimes sometimes only a few meters apart with hard, not soft rock layers. surface layer