中文摘要：

在河南省汝阳盆地原划分的古近系始新统“蟒川组”中新发现了大量的恐龙化石。这个动物群主要以植食性的巨型、大型蜥脚类恐龙为主，兼有鸭嘴龙类及肉食性小型兽脚类、大型肉食龙类为辅的恐龙动物群，经初步研究确认至少有10种以上新属种恐龙，还有大量的恐龙蛋壳、龟鳖类、双壳类、植物类等丰富的动植物化石，被称为“汝阳巨型蜥脚类恐龙动物群”。该动物群代表了我国早白垩世晚期至晚白垩早期的恐龙动物群，其分异程度也比以前想象的高得多。而轮藻、介形虫和孢粉等微体化石组合特征、地层叠合关系和区域对比等综合分析，更多显示了汝阳盆地赋存恐龙化石的地层时代为早白垩世中晚期的特征。无疑，汝阳盆地原划分为始新世的“陈宅沟组”、“蟒川组”应为自垩纪，至于是早白垩世中晚期或是晚白垩世早期，还需要更多的证据才能确定。

英文摘要：

Recently,lots of dinosaurs found from the originally named Paleogene ＂Mangchuan Formation＂ of the Ruyang Basin of Henan Province form a distinct dinosaurian fauna. It is dominated by plant-eating gigantic to large-sized sauropods, accompanying with small theropods, and hadrosaurids. The preliminary study indicates that at least 10 kinds of new dinosaurs and lots of dinosaur egg fragments, turtles, bivalves and fossil plants have been discovered.It was called the Ruyang Gigantic Sauropod Dinosaurian Fauna by L et al.. It represents a new late Early Cretaceous to early Late Cretaceous dinosaurian fauna from China. The diversity of sauropods is much higher than the previously thought. Based on microfossil assemblage features, such as charophyta, ostracods and spores and pollens, stratum characters and regional correlation, the geological age of the dinosaur-bearing ＂Mangchuan Formation＂ from the Ruyang Basin is regarded to belong to mid—late Early Cretaceous. Undoubtedly, the originally assigned Eocene ＂Chenzhaigou Formation＂ and ＂Mangchuan Formations＂ of the Ruyang Basin should be long to Cretaceous, however, this still needs evidence to decide whether it belongs to mid—late Early Cretaceous or early Late Cretaceous.