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Dykes , bedding planes and sill

Can someoe explain what bedding planes , dyke and sill are and how they form? The aqa textbook is very bad.
Reply 1
Avatar for abc246
abc246
A bedding plane is the boundary between two beds (layers of sedimentary rock).

A dyke is an igneous intrusion that cuts across bedding planes and is therefore described as discordant. They will often follow lines of weakness in rocks such as joints, faults etc.

Sills are intrusions which are described as concordant as they run parallel with the beds, usually along bedding planes. A transgressive sill is one which runs parallel with the beds for a time but then cuts across to another one, forming as sort of 'stepped' pattern.
Reply 2
Avatar for alex p
alex p
11
just to add in bedding planes form due to changes in the rock, whether mineralogical etc.

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