Seven grade distribution in the narrow vision and HK8 HK5 etc.. Lying below grade five and grade six. Afternoon class is 2,32 minimum thickness (see HK5) and afternoon class is thickest 5,14m (see HK8), average thick bottom height 3,63m. Change from grade 5 44,20m (HK8) - to - 41,55m (HK5). Seventh fortified products are completely limestone, the main ingredient is the debris of grade four hit the hotel and golden brown. It became completely lightning weathered. Experiments were carried out in the classroom, incorporating samples and 02, quota at one point 2.3-6 synthetic plate.
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