Sedimentary Rock Flashcards
Cementation
Below compacted layer
Presence of water and mineral silts cements grains to form rock
Compaction
Rocks formed from sheer weight
Water squeezed out
Clastic rock
A sedimentary rock formed of mineral/rock frags
Classifying clastic rock
By Sediment size
Types:
Conglomerate
Breccia
Conglomerate
Larger pcs of sedi
Smooth rocks formed in fast moving water (motion chips edges. Leaves smooth rock)
Breccia
Of smaller, sharper sediment
Flowed shorter distances or formed at depths with less motion
Chemical rock
Water that flows through cracks carries dissolved mineral n empties to ocean.
Causes saltiness of seawater.
Minerals that crystallize out of this water form chem rock
Types of chem rock
Limestone
Rock gypsum
Rock salt
Chem rock characteristics
Uniform color
Crystal tex sim to intrusive igneous
One dominant mineral (vs the multi mineral of igneous)
Biochemical rock
Contains remains of organisms
Eg coal, chert
