据现场考察，此砾石层位于上第三系玄武岩之上，出露高度50—100米。
The field investigation show that the stratum lie upon Neogene system Basalt and the outcropping is altitude of 50-100m.
本文还介绍了为提高复合片钻头经济指标的诸钻头参数设计的理论根据，如负前角、旁通角、出露高度、复合片布置等等。
The present paper also introduces the theory for the design of bit parameters in order to improve the economic target, such as negative rake angle, bypass angle and the exposure height.
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