7 Answered Questions for the topic sedimentology


The grains of the parabolic dunes?

My text book says that parabolic dunes consist of consolidated limestone grains, but I wondered if they have sand grains too, so I googled this issue and found that they consist of sands, but I am... more


Presence of cross stratified conglomerates in fan deltas?

Why are cross stratified conglomerates found in deposits of fan deltas? I know that fan deltas are alluvial fans that deposit directly into the sea, hence they are poorly sorted.But could not... more


Is Desert Sandstone a chemical sedimentary rock?

I gather that chemical sedimentary rocks are formed when minerals in solution are supersaturated and therefore they precipitate out. I also understand that desert sandstone is formed as Iron Oxide... more


Sediment layer chronology?

In the new Cosmos series, Neil DeGrass Tyson in explaining different ways the age of the world has been determined, shows how sedimentary layers at the Grand Canyon are a fossil record of a lot of... more


What are the differences between alluvial, eluvial and colluvial deposits?

There's always confusion and disagreement when these terms are mentioned. Need to be sure of their exact meanings.


Determining a rock age using volcanic ash layer?

I wanted to know if volcanic ash deposits found in the geologic record are most useful in correlating the age of rock layers if the volcanic ash was distributed over a large area during a short... more


What is the difference between eluvium and alluvium?

I was reading about kimberlite on Wikipedia and it mentioned eluvium. I've heard of alluvium, alluvial fans, alluvial deposits, etc. However, when I looked up eluvium, it sounded exactly like... more

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