rock unit meaning in English

岩石地层单位

Sequences of rock units are incompletely known .
岩石单元的层序了解得不完全。
Informal rock units
非正式岩层单位
Time - rock unit
时岩单位
I also define each unite of formation and members . including characters of petrology and regional distribution . finally , the stratigraphical framework have been constructed based on consistencies of petrology , facies and the relationships of rock units
同时对所划的各组、段的特征、含义进行了详细描述，最后依据岩性岩相特征、地层接触关系等，进行了区域对比，建立了该区石炭系的岩石地层格架。
5 . based on the analysis of their source rocks , the mesozoic detrital rocks in feixi area are mainly derived from metamorphic rocks of fuziling and luzhengguan groups , and the provenance of fenghuangtai formation is a disappeared ultra - high pressure metamorphic rock unit characterized with inland arc eclogites
物源分析表明，位于肥西地区中生代碎屑岩主要来自佛子岭群和卢镇关群变质岩，凤凰台组的源区来自于一个已经消失的以岛弧榴辉岩为代表的含超高压变质岩单元。