Ex 6 Sedimentary Rocks and Structures
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12 Terms
Discontinuous Series
Olivine, pyroxene, amphibole, biotite
Continuous Series
Plagioclase
Residual Phases (last to crystallize)
K-Spar, muscovite, quartz
Which mineral is the most unstable at Earth’s surface?
Olivine
Which minerals are the most stable at Earth’s surface?
K-Spar, muscovite, quartz
Why are clays the most abundant fragmental minerals?
Because of the abundance of plagioclase feldspar
Graded Bedding
a sedimentary structure where the grain size of sediment gradually decreases from the bottom of a layer to the top
Cross Bedding
a sedimentary structure characterized by layers that are inclined or angled to the main bedding planes
Ripple Marks
a sedimentary structured indicating agitation by water or directly by wind
Mud Cracks
sedimentary structures formed as muddy sediment dries and contracts
Sole Marks
sedimentary structures formed on the base (sole) of a bed, indicating past flow directions and other depositional conditions
Trace Fossil
geological records of the activities and behaviors of past life
Note 
Flashcards (36)