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残存于济南市历下区龙洞一带下古生界出露区岩溶负地形中的砾岩体,总体呈浅褐灰色,由砾石及胶结物组成。灰岩、白云岩砾石,砾径大小不一,呈次棱角—次圆状,燧石砾、褐铁矿砾成熟度高、磨圆度好,表面光洁,呈蜡状光泽,钙质孔隙式及接触式胶结,已硬结成岩,砾岩体与周围呈角度不整合接触关系。通过对比研究,初步认定其为新近纪上新世-第四纪更新世白彦组沉积,这一新发现填补了该区岩石地层单位的一项空白,为研究地质构造发展史提供了重要的佐证。
Residue in the lower reaches of the Lixia area of Jinan City, Lower Paleozoic exposed area karst negative terrain in the conglomerate body, the overall light beige, composed of gravel and cement. Limestone, dolomite gravel, gravel diameter of different sizes, was angular - sub-round, flint gravel, limonite gravel maturity, good roundness, smooth surface, waxy, calcareous pore and Contact cementation has been hard rock, conglomerate body and the surrounding angular contact between the non-contact relationship. Based on the comparative study, it is preliminarily identified as the Neogene-Quaternary Pleistocene Baiyan Formation sedimentation. This new discovery fills a blank of the lithostratigraphy unit in the area and provides important information for studying the history of geological structure development evidence.