地质年代:指地质体形成或地质事件发生的时代。分为: 1、相对年代:地质体形成或地质事件发生的先后顺序。 2、绝对年代:地质体形成或地质事件发生时距今多少年(由同位素年龄确定)

《地质论评》：对《自然》《科学》杂志报道的热河生物群、道虎沟生物群重大发现与研究进展的述评（中国地质科学院地质研究所：姬书安）

Determination of the top sur faces of the beds from the scour surfaces

Review Show the homework and note book on your desk Practise measurement of attitude of planes and lines in the models

TERMINOLOGY FOR DISPLACEMENT a is the rake angle

Determination of the relative movement of the two walls from the tension joints

Main Bedding Types Bedding Shape level bedding ripple bedding Main Types of plate laminae

Chapter 2 Primary Sedimentary Structures Main types of bedding Determination of younger direction of beds from primary structures Types of stratigraphic break Angular unconformity Soft sedimentary structures

Review of Faults and Fractures (Read the summary of faulting in the copy papers after class)

1.褶皱等倾斜线图的编制 1.1褶皱等倾斜线图的编制