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陆相白垩 -古近系过渡段的生物地层记录通常稀少而不连续。从轮藻角度讲 ,中国当阳跑马岗组的白垩 -古近系过渡段的生物地层记录是世界上迄今所知的最连续和最丰富的。该过渡段剖面的介形类也非常丰富 ,其它建立界线辅助层型所需的许多条件也很好 ,或许当阳跑马岗组剖面可作为白垩 -古近系界线陆相辅助层型的候选剖面。对该剖面白垩 -古近系界线附近的轮藻组合作了简要的介绍。
Terrestrial chalk - Paleogene transitional biostratigraphic records are usually sparse but not continuous. From the perspective of chaos, the bio-stratigraphic record of the Cretaceous-Paleogene transitional section of the Dangyang Paomang Formation in China is the most continuous and abundant in the world so far known. The transitional section profile is also very rich in terms of orthogonality, and many of the other conditions required to establish the boundary-assisting layer type are also good, perhaps when the Dangyang Paleangang Formation profile can be used as a candidate profile of the continental facies auxiliary layer type of the Cretaceous-Paleogene boundary . A brief introduction is given to the Chara hybrids near the Cretaceous-Paleogene boundary of the section.