Sedimentary logs & Walther's Law

Question 1

Hvad er en weathering profile?

Answer 1

En lodret tegning med lige venstreside og en højreside, hvis ‘udbulning’ repræsenterer ‘udbulningen’ i outcroppet ift. hinanden. Hvis et stykke ovenover er smallere end det nedenunder, skal det nederste være længere i bredden end det ovenstående.

Der er ikke mål på, så den skal ikke repræsentere tykkelsen af lagene men derimod de forskellige sedimenter

Question 2

What is transgression and regression?

Answer 2

Transgression = water rises and moves into the land = retrogradation

Regression = water recedes and moves away from land = progradation

Question 3

What is Walther’s law?

Answer 3

A drawing of where the lands meets the sea.
The soft, curved depositional lines showing lateral movement

Constant sediment supply to shelf = continued deposition (adding sediment) building up the layers on the sea bed –> shallower water

Areas formerly below storm wave base –> now part of offshore transition zone

Areas formerly in offshore transition zone –> now part of shoreface zone above fair-weather wave base

= vertical succession of facies progressively shallow upwards

Question 4

See drawings of both weathering profile and Walther’s law in the notebook