What does transgression mean geology?
1. n. [Geology] The migration of shoreline out of a basin and onto land during retrogradation. A transgression can result in sediments characteristic of shallow water being overlain by deeper water sediments. Antonyms: regression.
What is a regression in geology?
Regression: the oceanward migration of the shoreline (i.e., draining of flooded land) During a transgression the sequence of rocks will show an onlap sequence (the facies will become deeper-water environments as you move up through the sediments).
How old is sandstone rock?
3.96 billion years
So far, the oldest rock found and dated has an age of 3.96 billion years. Individual zircon grains in sandstones have been dated to 4.1 to 4.0 billion years old.
What causes a transgression geology?
A marine transgression is a geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, which results in flooding. Transgressions can be caused by the land sinking or by the ocean basins filling with water or decreasing in capacity.
What is Retrogradation geology?
Retrogradation is the landward change in position of the front of a river delta with time. This occurs when the mass balance of sediment into the delta is such that the volume of incoming sediment is less than the volume of the delta that is lost through subsidence, sea-level rise, and/or erosion.
What is progradation and Retrogradation?
Regression: ocean moves away from shore; result of sea level fall. Progradational: shore and nearshore deposits move outward into the ocean and overlie deeper water deposits.
How old is conglomerate?
The layers of Meta-conglomerate rocks have an age of more than four billion years, so it believes the oldest conglomerate rock on the planet.
What is shale and slate?
Shale is a sedimentary rock, and Slate is a metamorphic rock, but both are fine-grained. Shale looks dull, and Slate looks shiny when observed in daylight. Shale is water-resistant as compared to Slate, due to which freezing does not affect us. Slate is more durable as compared to Shale.
What is the difference between gelatinization and retrogradation?
The key difference between gelatinization and retrogradation is that gelatinization refers to the act of making or becoming gelatinous, whereas retrogradation refers to the motion in a retrograde manner. The terms gelatinization and retrogradation describe the properties of starch.
What is progradation and retrogradation?
What is Aggradation and progradation?
Progradational: shore and nearshore deposits move outward into the ocean and overlie deeper water deposits. Retrogradational: deeper water deposits move towards land and overlie shallow water deposits. Aggradational: facies remain in the same general location and stack atop others of the same facies.
What is Prograding shoreline?
Definition of Prograding coast: A coast where sediment is deposited, such that the shoreline is shifting seaward.