Crinoidea belong to 

Globigerina ooze is composed of 

Graptolite belongs to the ----------- phylum.

In an unconformity, the rocks on opposite sides are not parallel, then its is 

Joints perpendicular to the axes of folds are common in orogenic belts, such joints are called

Oscillation ripple marks can readily be used to identify whether a bed is right-side-up or