溶洞
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石(shí )灰(huī )岩(yán )地(dì )区(qū )地(dì )下(xià )水(shuǐ )沿(yán )岩(yán )层(céng )层(céng )面(miàn )或(huò )裂(liè )隙(xì )溶(róng )蚀(shí )并(bìng )经(jīng )塌(tā )陷(xiàn )而(ér )成(chéng )的(de )岩(yán )石(shí )空(kōng )洞(dòng )。洞(dòng )内(nèi )常(cháng )见(jiàn )有(yǒu )钟(zhōng )乳(rǔ )石(shí )和(hé )石(shí )笋(sǔn )。
方(fāng )纪(jì )《三(sān )峡(xiá )之(zhī )秋(qiū )》:“而(ér )在(zài )南(nán )津(jīn )关(guān ),那(nà )个(gè )显(xiǎn )然(rán )是(shì )三(sān )峡(xiá )瓶(píng )口(kǒu )的(de )坝(bà )址(zhǐ ),却(què )又(yòu )是(shì )石(shí )灰(huī )岩(yán )地(dì )区(qū );而(ér )且(qiě )有(yǒu )不(bú )少(shǎo )大(dà )大(dà )小(xiǎo )小(xiǎo )的(de )溶(róng )洞(dòng )。”
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