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State Walthers Laws
Sedimentary environments that started out side by side will end up overlapping one another over time due to sea level change. The vertical sequence of facies represents facies that were once laterally continuous
What is the ideal gradation of facies in a regressive sequence
Limestone—- shale—- siltstone—- sandstone
What is transgressions sequence?
Onlap, fining upwards —> Deep water sediments over shallow water sediments
What is regressions sequence?
Offlap, coarsening upwards —→ Shallow water sediments over deep water sediments
Transgression causes…
Melting of polar icecap
Increase in size of mid-ocean ridges
Tectonic subsidence of land in coastal areas
Regression causes…
Buildup of ice in polar ice caps
Formation of continental glaciers
Localized uplift of land in coastal areas
