产地：安徽省巢湖市
特征：
棕黄色，砾石为石英岩砾和燧石砾石，圆状~滚圆状，砾石长轴承定向排列，填隙物为石英砂，为无障壁高能海岸产物。砾岩（Conglomerate），粒径大于2毫米的圆状和次圆状的砾石占岩石总量30%以上的碎屑岩。砾岩中碎屑组分主要是岩屑，只有少量矿物碎屑，填隙物为砂、粉砂、粘土物质和化学沉淀物质。根据砾石大小，砾岩分为漂砾（>256毫米）砾岩、大砾（64～256毫米）砾岩、卵石（4～64毫米）砾岩和细砾（2～4毫米）砾岩。根据砾石成分的复杂性，砾岩可分为单成分砾岩和复成分砾岩。
不同成因的砾岩，在砾石成分成熟度、粒度分布、形状、圆度表面特征，以及砾石空间排列上都有较明显的差异。砾岩的成分、结构、砾石排列方位，砾岩体的形态反映陆源区母岩成分、剥蚀和沉积速度、搬运距离、水流方向和盆地边界等自然条件。愈靠近盆地边界，沉积物的粒度愈大，其中陆源碎屑总含量也愈高。此外，古砾石层常是重要的储水层，砾岩的填隙物中常含金、铂、金刚石等贵重矿产，砾岩还可作建筑材料。
采集人：王冠民
Provenance: Chaohu, Anhui, China
Characteristics:
Conglomerate is a coarse-grained clastic sedimentary rock that is composed of a substantial fraction of rounded to subangular gravel-size clasts, eg. granules, pebbles, cobbles, and boulders, larger than 2 mm (0.079 in) in diameter. Conglomerates form by the consolidation and lithification of gravel. Conglomerates typically contain finer grained sediment, eg. either sand, silt, clay or combination of them, called matrix by geologists, filling their interstices and are often cemented by calcium carbonate, iron oxide, silica, or hardened clay.
The size and composition of the gravel-size fraction of a conglomerate may or may not vary in composition, sorting, and size. In some conglomerates, the gravel-size class consist almost entirely of what were clay clasts at the time of deposition. Conglomerates can be found in sedimentary rock sequences of all ages but probably make up less than 1 percent by weight of all sedimentary rocks.
Gatherer: Wang Guanmin