Upper Cretaceous : Including the Sifangtai Formation — Minshui Formation, corresponding to the Cenonian — Maestrichtian. 四方台组—明水组为白垩系上统, 相当于赛诺—梅斯特利克蒂阶(Senonian—Maestrichtian).
The chalazal parts of the endosperm containing free nuclei forms several lobes.包含游离核的合点端胚乳部分形成几个裂片.The nuclei are large, irregular, hyperchromatic, and show prominent nucleoli.细胞核大 、 不规则 、 核浓染, 核仁清晰明显.In most mammals mat...
Ore minerals in the Colorado - type deposits are of uraninite and coffinite, with associated vanadium and minerals.科罗拉多型矿床中的铀矿物为晶质铀矿和水硅铀矿, 与之共生的还有钒,铜矿物....