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This paper summarized the sedimentary facies types and characteristics of the Upper Cretaceous Yaojia Formation in Baiquan area, Songliao Basin. It is considered that the Yaojia Formation in Baiquan area can be divided into upper and lower members. The upper member of Yaojia Formation has meander river facies and delta facies, while the lower member has braided river facies and delta facies, and further be divided into 6 subfacies and 10 sedimentary microfacies. The braided river facies sand body of the lower member of Yaojia Formation has large thickness, good uranium anomaly has been found, which has good uranium metallogenic potential, and is a favorable area for uranium prospecting in the future.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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