地质工程勘察地层划分规律 ;!U`GN,tH
https://wenku.baidu.com/view/ad8d6ce65901020206409c17.html O H~X~n-Z
白垩系地层划分 (3z: ;
https://wenku.baidu.com/view/6a1297e1b7360b4c2f3f64e0.html?rec_flag=default&sxts=1580030512012 ZzfGs
地层的划分和对比 #q. Q tDz
https://wenku.baidu.com/view/fc42b7d3dd36a32d727581ea.html?rec_flag=default&sxts=1580030571204 |eT?XT<=o
第七章地层的划分和对比 @7xb/&N
https://wenku.baidu.com/view/26e38d1dc281e53a5802ffb6.html?sxts=1580030919397