Glossary :: B

Bed
A centimetre to decimetre layer in a stratigraphy. Beds can be massive or contain structures, such as cross bedding, ripple marks or laminations. Beds are grouped into formations. ...More
Biological species concept
Species are groups of actually or potentially interbreeding natural populations that are reproductively isolated from other such groups. See also morpospecies concept and phylogenetic species concept....More
Blueschist
A low temperature, high pressure regionally metamorphic rock, containing abundant glaucophane. ....More
Bouma Sequence
The five part deposit produced by a waning turbidite flow. The deposit is split into:Structureless massive sand with gravel-rich erosional base.Parallel bedded sands produced by the upper flow regime.Cross laminated sands with ripple marks. Deposited in t...More
Breccia
A clastic rock composed of a matrix and angular clasts. A fine example of a breccia are the Devonian deposits at Siccar Point. See also conglomerate....More

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