STUDIES FOR STUDENTS 435 



KEY TABLE FOR IDENTIFICATION OF VARIOUS CLASSES OF SEDIMENTS 



Fluvio-glacial 



Lacustrine 



(Near-Shore 



Phase) 



Lacustrine 



(StiU-Water 



Phase) 



Shallow-Water 



Marine _ 



(Zone of Major 



Agitation) 



Shallow-Water , 



Marine 



(Zone of Minor 



Agitation) 



Texture 



Textural range . . . . 

 Stratification 



Constitution 



Distribution 



Amount of dip . . . . 

 Direction of dip . . . 



Thickness 



Shape of pieces . . . . 



Fossils 



Characters not in 

 eluded above ... 



Medium 



Rather low 



Lenses and pockets 



Heterogeneous 

 In belts 



Cross-beds may 

 have high dips 



Diverge in one di 

 rection 



Decrease in one 

 direction 



Roundness on sub 

 angularity 



Terrestrial, worn if 

 marine 



Occur near till 



Variable 



Rather high 



Lenses, pockets, 

 belts 



Belts 



Variable within 

 limits 



In all directions, 

 chiefly from shore 



Variable 



Flattened or 

 rounded 



Fresh-water forms 

 (running-, surf-, 

 and still-water) 



Cross-bedding, 

 ripple-, wave-, 

 riU-marks, mud 

 cracks 



Fine 

 Low 

 Layered, laminated 



Over more or less 

 wide areas 



Essentially 

 horizontal 



Uniform 



Fresh-water forms 

 (still-water) 



Laminae 



Coarse 



High 



Lenses, pockets, 

 belts 



Heterogeneous 



Long, continuous 

 belts 



Variable within 

 limits 



In all directions; 

 especially from 

 shore 



Variable 



Flattened or 

 rounded 



Marine, with pos- 

 sible land forms 



Cross-bedding, 

 ripple-, wave-, 

 rill-marks, mud 

 cracks 



Fine 



Low 



Definite, contin- 

 uouslayers 



Mechanical, chem- 

 ical, and organic 

 deposits 



Continuous over 

 wide areas 



Essentially 

 horizontal 



Uniform 



Marine forms 



Possible ripple- 

 marks 



