南京迈皋桥北约1.5公里处乌龟山出露的大隆组与上覆青龙组整合接触,与下伏龙潭组断层接触,为一套薄层黑色含碳质泥灰岩,厚度大于16.6米。地层中夹有7—8层富碳质黑色泥灰岩、泥岩和硅质泥岩。这些岩石中含有大量的含钼莓状黄铁矿,其全岩钼含量可达0.135％,大都在0.048％至0.063％之间,均已达工业品位。 Approximately 1.5km north of Maigaoqiao in Nanjing, the Dalong Formation exposed from Turtle Mountain is integrated with the overlying Qinglong Formation and comes into contact with the underlying Longtan Formation fault. It is a thin layer of black carbonaceous marl with a thickness greater than 16.6 meters. There are 7-8 layers of carbonaceous black marl, mudstone and siliceous mudstone in the formation. These rocks contain a large number of molybdenum-containing raspberry pyrite, the whole rock molybdenum content of up to 0.135%, mostly in the range of 0.048% to 0.063%, have reached the industrial grade.