我市系丘陵地区,全市人多地少,经济比较发达。建房热已达白热化,红砖生产遍地开花。为了保护有限的良田,砖厂大都设在黄土坡上。一个个高高低低、连绵的粘土山坡就是砖厂的原料。但有不少的山坡外面是黄粘土,而里面则藏着褐色的页岩。早在七十年代末的一个冬季,市建材一厂为平整被开采的粘土矿床,把从地平面逐渐升高的页岩开采 My city is located in the hilly area, the city has more people and less land, and the economy is relatively developed. The building has become hot and the production of red bricks has blossomed. In order to protect the limited fertile fields, most of the brick factories are located on the loess slopes. One by one, high and low, continuous clay slopes are the raw materials of the brick factory. However, there are many yellow clay outside the hillside, and brown shale is hidden inside. In the winter of the late 1970s, a building material factory in the city flattened the mined clay deposits and gradually increased the shale production from the ground level.