Abstract
The alternating marine and nonmarine coal-bearing Lower Cretaceous successions are well developed in eastern Heilongjiang, northeastern China, including the Jixi Group in the west and the Longzhaogou Group in the east. The correlation of these two lithostratigraphic groups with the nonmarine Jehol Group is important for dating the exceptionally well-preserved Jehol Biota. The Early Cretaceous marine fossils recovered from eastern Heilongjiang include ammonites, bivalves, radiolarians, foraminifers and dinocysts. During the early Aptian transgression the ammonite fauna entered the Hulin and Mishan areas and the bivalve Aucellina fauna in the Jixi area. This enables correlation of the marine lower part of the Chengzihe Formation of the Jixi Group with the Qihulin Formation of the Longzhaogou Group.
Highlights
The upper Mesozoic deposits in China are mainly of nonmarine origin [1] [2]
The alternating marine and nonmarine coal-bearing Lower Cretaceous successions are well developed in eastern Heilongjiang, northeastern China, including the Jixi Group in the west and the Longzhaogou Group in the east
The Early Cretaceous marine fossils recovered from eastern Heilongjiang include ammonites, bivalves, radiolarians, foraminifers and dinocysts
Summary
The upper Mesozoic deposits in China are mainly of nonmarine origin [1] [2]. The lack of index fossils makes it difficult to correlate precisely the nonmarine Cretaceous successions with the standard geological time scale. It is problematic to identify the nonmarine Jurassic-Cretaceous boundary [3], and to date the well-known Jehol Biota [4] [5]. In eastern Heilongjiang in northeastern China, an upper Lower Cretaceous succession of alternately marine and nonma-. Since the discovery of the first ammonite specimen in 1958 [7], the coal-bearing beds in eastern Heilongjiang have attracted the attention of the Chinese geologists, because of the economic value of the coal, and owing to the difficulties of stratigraphic correlation of the nonmarine and marine beds
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