Chapter 2 Primary Sedimentary Structures ● Main types of bedding O Determination of younger direction of beds from primary structures Types of stratigraphic break Angular unconformity O Soft sedimentary structures
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
Tt Main Bedding Types. Bedding Shape level bedding ripple bedding 2 ain Iypes o f plate [3 amina Bedding wedge trough graded bedding
Main Types of Bedding level bedding ripple bedding cross -bedding graded bedding plate laminae wedge trough Main Bedding Types Bedding Shape
;∵∵·∴·∴ “··; Graded Bedding Fine grains distribute in the whole bed. coarse grains decrease from the :· bottom to the top
Graded Bedding Fine grains distribute in the whole bed, coarse grains decrease from the bottom to the top
甲· a8。嚣"● ●:∵ 88 B C D 图2-4根据粒级层理确定岩层顶、底面 (据M. P. Billings,) 一水乎岩层,每层自底到顶由粗变细B~正常倾斜岩层,顶面在左上方C一顶面在 右边的直立岩层D-顶面在左下方的倒转岩层 Determination of the top and bottom surfaces from graded bedding AB-normal beds.C- vertical beds. Overturned beds
Determination of the top and bottom surfaces from graded bedding A, B– normal beds; C– vertical beds; D– overturned beds
A B C 图2-4根据交错层理确定岩层顶、底面 A.顶面在左边,正常层序;B.岩层直立,顶面在右边;C.顶面在右边,岩层倒转 Determination of the top and bottom surfaces from cross-bedding, the oblique laminae converge to the bottom of the bed A-normal beds, top to the top left; B-vertical beds, top to right; C-overturned beds, top to the bottom right
Determination of the top and bottom surfaces from cross-bedding, the oblique laminae converge to the bottom of the bed A– normal beds, top to the top left; B– vertical beds, top to right; C– overturned beds, top to the bottom right